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[Music]

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lca2022

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tna my name is joel um welcome back to

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day two of lca's sessions

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we have florian with you with us here um

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florian runs the education business unit

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at city network and has worked

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exclusively with open source software

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since about 2002.

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florian has been involved with openstack

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and ceph that's actually how i think i

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first met florian a few years ago at an

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openstack summit for my sins

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and is involved with the open edx

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educational project since around mid

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2015.

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florian is going to be talking and

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covering the basics of stereoscopic

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imagery and projection so we're going to

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discover how stereoscopic vision works

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and how we can trick our brains into

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perceiving depth from two flat

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two-dimensional images

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this is not florian's first time at lca

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but this is his first without suffering

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through jet lag

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um you can also get the slides for

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today's talk um which someone will pop

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into the chat um they have in-depth

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notes and some details that can go along

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with the talk today no my head am i

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florian

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thank you so this is my introduction to

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stereoscopic photography

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and videography and i do want to start

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this talk with an important note on

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accessibility so some of this talk does

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assume that you have functional vision

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in both eyes uh you will of course be

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able to see the images and the examples

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in this talk if you need to wear

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corrective lenses i certainly need to

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wear them too but if you do happen to

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have very bad vision or blindness in one

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eye then by the very nature of this

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topic there's some things that you won't

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be able to follow some examples that you

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won't be able to follow and i do

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apologize for that uh there's also a

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specific condition called

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stereoblindness which means that even

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though both your eyes are completely

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functional you're unable to perceive

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depth so if you have that condition then

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this talk might still be informative

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stereoblind people have seen this talk

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and then subsequently told me that they

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took away quite a bit from it it just

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might not be as immersive as it might be

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for people with stereo vision and

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likewise if you happen to have nystagmus

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or strabismus some of those limitations

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might also apply and possibly also if

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you're using an artificial lens implant

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which is common after cataract surgery

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again i do apologize for that uh in this

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case by the very nature of my topic

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there's unfortunately very little i can

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do to alleviate that however even if you

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yourself cannot see stereoscopic images

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and videos this talk does contain

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suggestions on how to make them which

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you can totally do even if you're making

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them for somebody else

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so with that said let's first get

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started with

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what stereoscopic vision or stereopsis

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as it's called really is

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and how it works so first of all what we

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need in order to visually perceive depth

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is two eyes and more specifically to

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forward-facing eyes so this is something

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that we humans have in common with say

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cats or foxes or owls

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that our eyes sit sort of on one side of

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the skull facing what we call forwards

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and they provide fields of view that

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overlap to a great extent and that of

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course comes at a cost namely the fact

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that our field of vision is relatively

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narrow so if you compare that for

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example to the field of vision of a

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horse where the eyes sit on the side of

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the skull the animal has almost 360

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degree vision only has a small blind

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spot directly to the rear of the skull

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and that's of course because a horse's

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evolutionary survival technique is

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flight so it's an herbivore and

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basically the sooner it can see a

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predator it can take flight and then it

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can live another day

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so it's kind of optimized for that

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we humans are predators ourselves and

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omnivores and we have evolved to sense

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depth and that of course greatly helps

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us in hunting particularly because we've

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also evolved brains that enabled us to

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make tools so if we make something like

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a spear or a lasso or a kylie or bow and

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arrow and we have an animal to throw or

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shoot it at then it greatly helps us to

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be able to sense intuitively but still

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pretty exactly how far that animal is

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away from us

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so how exactly does that work and what

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in our eyes and brains actually makes a

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sense depth

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and the first faculty that we need in

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order to perceive depth is the faculty

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of virgins so virgins is the ability to

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align the axes of our eyeballs so a line

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of sight as we call it um

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align them and essentially make them

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intersect pretty much arbitrarily in any

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point in space in front of us

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we might also be able to not make them

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intersect like when we stare aimlessly

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ahead but we can't really diverge our

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eyes but we can converge them almost

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arbitrarily and you can try that out

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most people will be able to stretch

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their arm out and then look at their

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fingertip and then bring the finger all

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the way in to the tip of the nose and

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still look at the fingertip while you're

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doing that and that might be very

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uncomfortable because it makes you very

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cross-eyed and you're not going to be

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able to hold that for very long but most

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people will be able to do that so we can

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converge our eyes

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almost arbitrarily

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to a very extreme degree

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and the second thing that we need is

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accommodation

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virgins gives us the ability to point

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both our eyes at one point in space and

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the other thing that we need for depth

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of vision is accommodation which is the

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ability to either stretch or to relax

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the elastic lens in our eyes or the

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thing that sits right behind our pupil

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and do that in such a way that there's a

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specific point in space or a specific

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plane in front of us that produces a

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sharp image on our retina in the back of

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the eye

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and commonly

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the point where we verge and the plane

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where we accommodate those intersect so

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we're kind of looking at the same

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spot in space in front of us using both

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of those things but we don't have to do

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that and we'll get to that in a second

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but what that means is when we are

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looking at something our eyes

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fundamentally produce two images and

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these two images are pretty much exactly

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identical in one spot so the thing that

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the spot that we verge on

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and then they are slightly different

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anywhere outside that spot

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and this is what we call binocular

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disparity and through what has to be an

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inordinate amount of

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trial and error and face plant

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in our infancy what our brain learns is

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to interpret these disparities between

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the two optical inputs as cues about

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depth

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and it's by these differences that our

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brain essentially builds a depth map of

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our surroundings

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so

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now that we know how real depth

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perception works meaning how our eyes

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signal to our brains that an object is

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at a greater or a lesser distance from

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us we can talk about how we can trick

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our brain

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into seeing depth when objectively there

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is none

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so taking two

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two-dimensional images and then making

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our brains conjure up a

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three-dimensional image from that

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so for example

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i've got two two-dimensional images here

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um and this one might correspond to what

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your left eye sees and this one

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corresponds to what your right eye sees

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so here's an example of such an image

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don't worry for now about how we make

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those and how we make that happen we'll

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get to that in a jiffy but

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the next thing that we need to talk

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about is stereoscopic projection and

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stereoscopic projection is about making

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your left eye see only the left eye

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image and making the right eye see only

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the right eye image so that your brain

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then puts everything together for an

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illusion of depth

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and there's multiple ways of doing that

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so i'll start with something very low

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tech a stereoscopic viewer or simply a

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stereoscope i happen to have one here

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let me swiftly explain how this works

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there is a

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little slider here and then you take a

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print of a stereoscopic image that you

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put in here you close the device so that

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the print is jammed in place and can't

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move about you bring the whole thing up

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to your face and then you can look

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through the eyepieces

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and there's something important that

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you'll see if you look at this little

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device from this angle which is there's

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a little black separator

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let's see here right there's a little

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black separator and it ensures that my

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left eye can't peek over at the right

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eye image and my right eye can't catch a

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glimpse of the left eye image this by

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the way is called a brewster type

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lenticular stereoscope

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and this was popularized by a chap named

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david brewster in 1849 so it's about 180

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years old

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um

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so that's a very low-tech device here a

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slightly more high-tech is a

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stereoscopic projector now stereoscopic

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projectors came along for slides in the

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1950s 60s

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so the principle is this you've got uh

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you've got a magazine of left eye images

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you've got a magazine of right eye

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images you put them into this projector

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and they get projected out uh via two

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different lamps two different projectors

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and they are polarized the light damage

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is polarized oppositely and then you

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wear goggles so that the

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stuff that is for your right eye that's

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polarized one way is hidden from your

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left eye and the thing that's polarized

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the other way

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that's for your right eye is hidden from

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your left eye

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and there are of course digital versions

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of this as well they're available to

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this day

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there's also 3d tv which is a similar uh

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concept except that you're not using two

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projectors but you're using a tv screen

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you've got one row of pixels

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that um or one line of pixels that

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emits light polarized one way and then

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the next line the next row

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emits light polarized the other way and

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then you wear goggles and then that

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picks everything apart again but that

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too has a downside just as with the

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polarized light projectors it's pretty

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involved on the technology and logistics

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side right you might need projectors you

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00:10:17,839 --> 00:10:19,920
might need a silver screen because you

281
00:10:19,040 --> 00:10:21,920
can't

282
00:10:19,920 --> 00:10:23,360
project polarized light onto a white

283
00:10:21,920 --> 00:10:24,800
wall that doesn't work it messes up the

284
00:10:23,360 --> 00:10:26,560
polarization on reflection you might

285
00:10:24,800 --> 00:10:28,320
need a big screen tv your audience needs

286
00:10:26,560 --> 00:10:29,839
goggles etc it's all very much

287
00:10:28,320 --> 00:10:32,160
non-trivial

288
00:10:29,839 --> 00:10:33,839
but what if instead we could employ a

289
00:10:32,160 --> 00:10:35,760
technique that requires none of that no

290
00:10:33,839 --> 00:10:37,440
special projection equipment no goggles

291
00:10:35,760 --> 00:10:40,160
no nothing where you can literally hang

292
00:10:37,440 --> 00:10:41,680
your stereo photography in a gallery and

293
00:10:40,160 --> 00:10:43,839
visitors could just scroll through and

294
00:10:41,680 --> 00:10:46,560
look at your images and see them in full

295
00:10:43,839 --> 00:10:48,240
depth and such a technique does exist

296
00:10:46,560 --> 00:10:49,839
and we're going to focus on it for the

297
00:10:48,240 --> 00:10:53,120
rest of the talk and it's called free

298
00:10:49,839 --> 00:10:55,680
viewing and it comes in two flavors

299
00:10:53,120 --> 00:10:58,480
now freebie in general means that we can

300
00:10:55,680 --> 00:11:01,200
take two stereoscopic images and we look

301
00:10:58,480 --> 00:11:03,680
at them using a certain technique that

302
00:11:01,200 --> 00:11:05,760
requires no stereoscope no projector

303
00:11:03,680 --> 00:11:07,760
nothing all that you do need is two

304
00:11:05,760 --> 00:11:09,519
functioning eyes and like i said they're

305
00:11:07,760 --> 00:11:11,120
two flavors of free viewing and there's

306
00:11:09,519 --> 00:11:13,360
one that's easy to explain and

307
00:11:11,120 --> 00:11:14,800
understand but somewhat difficult to do

308
00:11:13,360 --> 00:11:16,880
and there's another one that's a bit

309
00:11:14,800 --> 00:11:18,160
more complex to explain and comprehend

310
00:11:16,880 --> 00:11:19,680
but easier to do at least for most

311
00:11:18,160 --> 00:11:21,279
people and i'll start with the one

312
00:11:19,680 --> 00:11:23,920
that's easier to explain and then we'll

313
00:11:21,279 --> 00:11:27,040
move on to the one that's easier to do

314
00:11:23,920 --> 00:11:28,800
so the first one is called wall eyed

315
00:11:27,040 --> 00:11:30,480
free viewing warlike stereoscopic free

316
00:11:28,800 --> 00:11:34,560
viewing or sometimes called parallel

317
00:11:30,480 --> 00:11:36,720
view so what i have here is a print of a

318
00:11:34,560 --> 00:11:38,160
stereogram so it's the same image as the

319
00:11:36,720 --> 00:11:39,440
one that i showed you earlier that

320
00:11:38,160 --> 00:11:42,000
jammed into my stereoscope it's just

321
00:11:39,440 --> 00:11:43,760
blown up a bit right again the left eye

322
00:11:42,000 --> 00:11:45,120
images on the left the right the left

323
00:11:43,760 --> 00:11:46,560
images on the left the right are images

324
00:11:45,120 --> 00:11:47,680
on the right

325
00:11:46,560 --> 00:11:49,839
so

326
00:11:47,680 --> 00:11:51,519
if you were if i were to hold this up in

327
00:11:49,839 --> 00:11:53,680
front of you and you were just looking

328
00:11:51,519 --> 00:11:54,720
at this thing then normally what you

329
00:11:53,680 --> 00:11:57,920
would do

330
00:11:54,720 --> 00:12:00,720
is this your versions and accommodation

331
00:11:57,920 --> 00:12:03,120
points would sit right on the surface of

332
00:12:00,720 --> 00:12:05,120
the print so in this graphic here the

333
00:12:03,120 --> 00:12:06,639
dashed line is the surface so that would

334
00:12:05,120 --> 00:12:08,320
be the surface of the

335
00:12:06,639 --> 00:12:10,880
of the photo that we're looking at the

336
00:12:08,320 --> 00:12:12,240
dots are eyes the converging lines are

337
00:12:10,880 --> 00:12:14,720
the lines of sight that meet at my

338
00:12:12,240 --> 00:12:17,360
virgins point and the arrow represents

339
00:12:14,720 --> 00:12:19,680
my accommodation so that is the plane

340
00:12:17,360 --> 00:12:20,480
whose distance i set my eyes to

341
00:12:19,680 --> 00:12:23,600
so

342
00:12:20,480 --> 00:12:25,440
if i were to uh look at this thing or if

343
00:12:23,600 --> 00:12:27,600
you were to look at this thing it would

344
00:12:25,440 --> 00:12:29,040
look like this that's what your eyes do

345
00:12:27,600 --> 00:12:31,120
naturally

346
00:12:29,040 --> 00:12:34,079
but they don't have to

347
00:12:31,120 --> 00:12:36,720
because what you can also do

348
00:12:34,079 --> 00:12:38,800
is you can

349
00:12:36,720 --> 00:12:39,839
instead of looking at the surface of the

350
00:12:38,800 --> 00:12:42,560
print

351
00:12:39,839 --> 00:12:44,320
you can look at an imaginary spot behind

352
00:12:42,560 --> 00:12:45,760
the print

353
00:12:44,320 --> 00:12:47,600
or whatever surface it is that we're

354
00:12:45,760 --> 00:12:49,760
looking at just an imaginary spot behind

355
00:12:47,600 --> 00:12:51,200
that surface while maintaining your

356
00:12:49,760 --> 00:12:52,880
accommodation

357
00:12:51,200 --> 00:12:56,000
as it was before

358
00:12:52,880 --> 00:12:58,399
and if you do it just right then what's

359
00:12:56,000 --> 00:13:00,800
going to end up happening is your left

360
00:12:58,399 --> 00:13:02,399
eye looks just at the left eye image and

361
00:13:00,800 --> 00:13:04,959
your right eye looks just at the right

362
00:13:02,399 --> 00:13:07,440
eye image and then what you see is one

363
00:13:04,959 --> 00:13:09,040
image that overlaps that's made from

364
00:13:07,440 --> 00:13:11,040
both the source images and that

365
00:13:09,040 --> 00:13:13,360
magically has depth

366
00:13:11,040 --> 00:13:15,600
and i have an example up for you next so

367
00:13:13,360 --> 00:13:16,560
you can try this out

368
00:13:15,600 --> 00:13:17,920
so

369
00:13:16,560 --> 00:13:20,480
i don't know if you're watching this on

370
00:13:17,920 --> 00:13:23,040
a full-size monitor or a laptop screen

371
00:13:20,480 --> 00:13:24,399
or a big-screen tv or your phone so you

372
00:13:23,040 --> 00:13:25,600
may have to play with the distance

373
00:13:24,399 --> 00:13:27,600
between your screen and your eyes a

374
00:13:25,600 --> 00:13:30,079
little bit but the principle is in

375
00:13:27,600 --> 00:13:32,639
general the same what you want to do is

376
00:13:30,079 --> 00:13:34,800
you want to look over the top edge of

377
00:13:32,639 --> 00:13:36,560
the screen at a spot in the distance say

378
00:13:34,800 --> 00:13:37,839
a spot on the wall picture on the wall

379
00:13:36,560 --> 00:13:39,360
or something like that

380
00:13:37,839 --> 00:13:41,920
and that what you want to do is you want

381
00:13:39,360 --> 00:13:44,320
to try coming down just a little bit

382
00:13:41,920 --> 00:13:46,000
with your eyes so that you look at the

383
00:13:44,320 --> 00:13:48,160
actual image

384
00:13:46,000 --> 00:13:50,639
and not change the spot that you're

385
00:13:48,160 --> 00:13:52,560
looking at in the process

386
00:13:50,639 --> 00:13:54,880
and then what's going to happen is that

387
00:13:52,560 --> 00:13:57,120
the left eye image is going to be right

388
00:13:54,880 --> 00:13:58,800
in the line of sight of your left eye

389
00:13:57,120 --> 00:14:01,040
and your right eye image is going to be

390
00:13:58,800 --> 00:14:04,000
right in the line of sight of your right

391
00:14:01,040 --> 00:14:06,480
eye and what's then going to happen is

392
00:14:04,000 --> 00:14:09,279
that rather than seeing these two images

393
00:14:06,480 --> 00:14:12,160
you'll actually end up seeing three

394
00:14:09,279 --> 00:14:14,639
a left one that's blurry a right one

395
00:14:12,160 --> 00:14:16,639
that's blurry and then a center one

396
00:14:14,639 --> 00:14:17,600
from the other two overlapping that's

397
00:14:16,639 --> 00:14:19,519
sharp

398
00:14:17,600 --> 00:14:20,880
and that magically has

399
00:14:19,519 --> 00:14:22,880
depth

400
00:14:20,880 --> 00:14:24,560
so if you're not watching this live if

401
00:14:22,880 --> 00:14:27,519
you're watching this on the recording

402
00:14:24,560 --> 00:14:29,680
then now might be a good time to pause

403
00:14:27,519 --> 00:14:30,800
the playback and perhaps give this a few

404
00:14:29,680 --> 00:14:33,120
tries

405
00:14:30,800 --> 00:14:34,079
for now i leave it up for a few more

406
00:14:33,120 --> 00:14:36,399
seconds

407
00:14:34,079 --> 00:14:38,959
you can simply try that out again

408
00:14:36,399 --> 00:14:41,040
spot on the wall behind the picture

409
00:14:38,959 --> 00:14:42,639
bring your eyes down so you look at the

410
00:14:41,040 --> 00:14:45,760
picture and try

411
00:14:42,639 --> 00:14:47,600
not to look anywhere but

412
00:14:45,760 --> 00:14:48,399
distance wise but where you were staring

413
00:14:47,600 --> 00:14:50,399
at

414
00:14:48,399 --> 00:14:51,360
before

415
00:14:50,399 --> 00:14:53,680
but

416
00:14:51,360 --> 00:14:55,600
if this doesn't work for you

417
00:14:53,680 --> 00:14:57,839
please do not fret

418
00:14:55,600 --> 00:14:58,880
like i said this is the more difficult

419
00:14:57,839 --> 00:15:01,360
method

420
00:14:58,880 --> 00:15:03,120
and this is the one that actually

421
00:15:01,360 --> 00:15:04,639
is

422
00:15:03,120 --> 00:15:05,680
works for fewer people let's put it that

423
00:15:04,639 --> 00:15:07,680
way

424
00:15:05,680 --> 00:15:09,760
and i'll get to the one that's easier

425
00:15:07,680 --> 00:15:12,480
for most people including myself

426
00:15:09,760 --> 00:15:15,040
actually next

427
00:15:12,480 --> 00:15:17,040
all right so if any of you have managed

428
00:15:15,040 --> 00:15:18,639
to do this congratulations

429
00:15:17,040 --> 00:15:20,720
we'll move on now

430
00:15:18,639 --> 00:15:23,519
because the next um

431
00:15:20,720 --> 00:15:26,399
option that you have is cross-eyed

432
00:15:23,519 --> 00:15:28,399
stereoscopic free viewing or cross view

433
00:15:26,399 --> 00:15:29,600
so here's how that works

434
00:15:28,399 --> 00:15:31,519
what you do

435
00:15:29,600 --> 00:15:33,839
is and you're probably already guessing

436
00:15:31,519 --> 00:15:36,480
that right in a wall-eyed image so

437
00:15:33,839 --> 00:15:38,079
parallel view our virgin's point is

438
00:15:36,480 --> 00:15:39,360
behind the print

439
00:15:38,079 --> 00:15:42,079
while we're maintaining our

440
00:15:39,360 --> 00:15:44,000
accommodation on the plane of the print

441
00:15:42,079 --> 00:15:46,320
or the plane of the surface

442
00:15:44,000 --> 00:15:49,279
in a cross-eyed image it's in front of

443
00:15:46,320 --> 00:15:50,399
the print so graphically it looks like

444
00:15:49,279 --> 00:15:52,000
this

445
00:15:50,399 --> 00:15:52,800
and what that means of course is that

446
00:15:52,000 --> 00:15:53,680
now

447
00:15:52,800 --> 00:15:57,279
your

448
00:15:53,680 --> 00:15:59,680
right eye looks at the image on the left

449
00:15:57,279 --> 00:16:01,440
your left eye looks at the image on the

450
00:15:59,680 --> 00:16:03,759
right so

451
00:16:01,440 --> 00:16:06,560
a cross view stereoscopic image is

452
00:16:03,759 --> 00:16:10,000
actually reversed so camera takes these

453
00:16:06,560 --> 00:16:11,440
pictures and then you reverse them

454
00:16:10,000 --> 00:16:13,600
and the interesting bit about this is

455
00:16:11,440 --> 00:16:15,600
that this is easier for most people to

456
00:16:13,600 --> 00:16:17,759
voluntarily do i don't really know why

457
00:16:15,600 --> 00:16:19,519
but it's certainly true for myself as

458
00:16:17,759 --> 00:16:21,440
well so what you want to do if you

459
00:16:19,519 --> 00:16:23,440
haven't done this before on the next

460
00:16:21,440 --> 00:16:24,959
image is you want to cross your eyes

461
00:16:23,440 --> 00:16:26,320
really hard

462
00:16:24,959 --> 00:16:27,839
means you're totally overdoing it but

463
00:16:26,320 --> 00:16:29,279
that's totally okay

464
00:16:27,839 --> 00:16:30,880
and then you want to let your eyes

465
00:16:29,279 --> 00:16:33,120
settle back to normal

466
00:16:30,880 --> 00:16:35,839
and chances are that what's going to

467
00:16:33,120 --> 00:16:37,279
happen is by the time your eyes cross

468
00:16:35,839 --> 00:16:38,639
just to the point where everything falls

469
00:16:37,279 --> 00:16:40,720
into place you get such a strong

470
00:16:38,639 --> 00:16:42,800
stimulus in your brain that your brain

471
00:16:40,720 --> 00:16:45,199
really doesn't want to let go and then

472
00:16:42,800 --> 00:16:47,440
you see the depth image

473
00:16:45,199 --> 00:16:49,360
so here like i said for most people the

474
00:16:47,440 --> 00:16:50,959
next image will actually be easier than

475
00:16:49,360 --> 00:16:54,320
the one that i just showed you it's

476
00:16:50,959 --> 00:16:56,959
exactly the same motif it's just

477
00:16:54,320 --> 00:16:59,199
the sides are reversed right and again

478
00:16:56,959 --> 00:17:01,680
if you're watching this on a recording

479
00:16:59,199 --> 00:17:04,559
feel free to pause the stream here pause

480
00:17:01,680 --> 00:17:06,799
the playback and try this a few times

481
00:17:04,559 --> 00:17:10,000
until you get the hang of it most people

482
00:17:06,799 --> 00:17:11,600
will be able to do this

483
00:17:10,000 --> 00:17:13,600
and by the way when you initially try

484
00:17:11,600 --> 00:17:15,199
this it might actually help that you're

485
00:17:13,600 --> 00:17:17,679
using an image that's relatively large

486
00:17:15,199 --> 00:17:19,120
so it covers a rather large fraction of

487
00:17:17,679 --> 00:17:20,400
your field of vision once you get the

488
00:17:19,120 --> 00:17:22,000
hang of it doesn't matter once you get

489
00:17:20,400 --> 00:17:24,480
the hang of it you can do cross view on

490
00:17:22,000 --> 00:17:26,000
an image that's this tiny no problem but

491
00:17:24,480 --> 00:17:28,319
for learning it it's probably a good

492
00:17:26,000 --> 00:17:30,640
idea to start with a big image so again

493
00:17:28,319 --> 00:17:33,919
what you want to do is you want to stare

494
00:17:30,640 --> 00:17:36,640
at this image cross your eyes and then

495
00:17:33,919 --> 00:17:39,520
let your eyes come back to normal

496
00:17:36,640 --> 00:17:41,679
and at some point if you're lucky

497
00:17:39,520 --> 00:17:43,280
things are going to click into place

498
00:17:41,679 --> 00:17:44,480
again most people can't do this on the

499
00:17:43,280 --> 00:17:47,039
first try

500
00:17:44,480 --> 00:17:48,880
but if you give it a little time

501
00:17:47,039 --> 00:17:50,400
and i'll actually shut up for a few

502
00:17:48,880 --> 00:17:52,720
seconds now

503
00:17:50,400 --> 00:17:57,480
so that you can try this out most people

504
00:17:52,720 --> 00:17:57,480
will eventually succeed at this

505
00:18:04,880 --> 00:18:10,880
and just in case i'm making the av team

506
00:18:06,720 --> 00:18:10,880
nervous yes i'm still here it's all good

507
00:18:11,919 --> 00:18:15,679
and if you actually manage to get the

508
00:18:13,840 --> 00:18:17,520
depth effect what's going to happen

509
00:18:15,679 --> 00:18:19,280
relatively quickly is you're going to be

510
00:18:17,520 --> 00:18:21,120
able to see

511
00:18:19,280 --> 00:18:24,160
the relative depth of

512
00:18:21,120 --> 00:18:26,960
say these trim boxwood bushes uh you're

513
00:18:24,160 --> 00:18:29,280
going to see what the distance is to the

514
00:18:26,960 --> 00:18:31,360
various people in the image you're going

515
00:18:29,280 --> 00:18:33,120
to be able to see the depth of the

516
00:18:31,360 --> 00:18:35,200
stairs you're going to be able to see

517
00:18:33,120 --> 00:18:37,120
the depth of the columns

518
00:18:35,200 --> 00:18:38,960
you're also going to be able to see how

519
00:18:37,120 --> 00:18:41,840
far the ridge line or actually the two

520
00:18:38,960 --> 00:18:43,600
ridge lines are that are behind the

521
00:18:41,840 --> 00:18:45,039
building

522
00:18:43,600 --> 00:18:46,640
and uh

523
00:18:45,039 --> 00:18:48,640
if any of you manage this now i'm

524
00:18:46,640 --> 00:18:50,480
unfortunately i'm unable to look into

525
00:18:48,640 --> 00:18:52,720
the chat right now but i'm really really

526
00:18:50,480 --> 00:18:55,039
hoping that some of you um succeeded

527
00:18:52,720 --> 00:18:58,000
this because when it works it's

528
00:18:55,039 --> 00:19:00,000
uh it's it's uh it's it's a really sort

529
00:18:58,000 --> 00:19:02,720
of satisfying feeling

530
00:19:00,000 --> 00:19:04,960
so of course i'm not going to assume

531
00:19:02,720 --> 00:19:06,960
that you're watching this through a 3d

532
00:19:04,960 --> 00:19:09,440
projector and i also cannot assume that

533
00:19:06,960 --> 00:19:11,360
you have a stereoscope at hand so from

534
00:19:09,440 --> 00:19:13,919
now on for the rest of this talk i'm

535
00:19:11,360 --> 00:19:15,200
going to default to free viewing and i'm

536
00:19:13,919 --> 00:19:17,440
going to default to cross site

537
00:19:15,200 --> 00:19:19,760
previewing specifically

538
00:19:17,440 --> 00:19:21,520
so now that we've seen

539
00:19:19,760 --> 00:19:24,240
what stereograms are and we've hopefully

540
00:19:21,520 --> 00:19:27,280
learned how we look at them let's talk

541
00:19:24,240 --> 00:19:29,440
about how we make them

542
00:19:27,280 --> 00:19:31,919
and as you can imagine there are

543
00:19:29,440 --> 00:19:33,840
multiple ways of doing that so

544
00:19:31,919 --> 00:19:36,880
the first thing that i guess a lot of

545
00:19:33,840 --> 00:19:38,880
you might think of is well maybe i need

546
00:19:36,880 --> 00:19:40,480
to put a special lens on my camera and

547
00:19:38,880 --> 00:19:44,080
such a thing totally exists so there are

548
00:19:40,480 --> 00:19:45,520
stereoscopic lenses so for example um

549
00:19:44,080 --> 00:19:48,000
the next one that i'm showing here this

550
00:19:45,520 --> 00:19:49,919
happens to be a discontinued product but

551
00:19:48,000 --> 00:19:52,480
this is a stereoscopic lens that you can

552
00:19:49,919 --> 00:19:53,840
just put on a camera so you use it like

553
00:19:52,480 --> 00:19:56,080
any other prime lens so you can do

554
00:19:53,840 --> 00:19:58,000
autofocus auto exposure and whatnot and

555
00:19:56,080 --> 00:19:59,280
it will create two stereoscopic images

556
00:19:58,000 --> 00:20:01,200
in one frame

557
00:19:59,280 --> 00:20:03,840
but if you look at this you will also

558
00:20:01,200 --> 00:20:06,480
quickly realize this has a flaw

559
00:20:03,840 --> 00:20:08,720
which is that the two lenses

560
00:20:06,480 --> 00:20:11,200
are extremely close together they're

561
00:20:08,720 --> 00:20:13,520
much closer together than human eyes so

562
00:20:11,200 --> 00:20:16,400
that means this will make the pictures

563
00:20:13,520 --> 00:20:19,200
heavily hypostereoscopic

564
00:20:16,400 --> 00:20:21,840
so hypostereoscopic is

565
00:20:19,200 --> 00:20:23,679
when the stereoscopic distance that is

566
00:20:21,840 --> 00:20:25,679
to say the distance between the two

567
00:20:23,679 --> 00:20:28,720
lenses or the two spots in space where

568
00:20:25,679 --> 00:20:30,960
we took the images is a lot less than

569
00:20:28,720 --> 00:20:32,320
the image between your pupils so the

570
00:20:30,960 --> 00:20:33,760
distance between your i'm sorry the

571
00:20:32,320 --> 00:20:35,039
distance between your pupils the

572
00:20:33,760 --> 00:20:37,600
distance between your pupils is

573
00:20:35,039 --> 00:20:39,120
approximately 70 millimeters and in this

574
00:20:37,600 --> 00:20:40,880
case the lens has a stereoscopic

575
00:20:39,120 --> 00:20:43,039
distance of maybe 10 millimeters and

576
00:20:40,880 --> 00:20:46,640
what that means is that the stereoscopic

577
00:20:43,039 --> 00:20:49,520
effect that you're getting from these is

578
00:20:46,640 --> 00:20:51,520
a lot less pronounced you you'll get a

579
00:20:49,520 --> 00:20:54,799
lot less

580
00:20:51,520 --> 00:20:56,240
depth than you'd perhaps expect this

581
00:20:54,799 --> 00:20:59,120
sort of lens is still interesting for

582
00:20:56,240 --> 00:21:00,480
doing uh macro stereo photography so you

583
00:20:59,120 --> 00:21:02,159
combine this with a macro ring for

584
00:21:00,480 --> 00:21:04,159
example and that can produce really

585
00:21:02,159 --> 00:21:07,280
really interesting results so for

586
00:21:04,159 --> 00:21:09,760
example i've taken macro stereo shots of

587
00:21:07,280 --> 00:21:13,200
tiny shells and that's very interesting

588
00:21:09,760 --> 00:21:15,840
but sort of for general purpose use

589
00:21:13,200 --> 00:21:19,200
this doesn't really work too well

590
00:21:15,840 --> 00:21:20,559
but there's uh the next step which is

591
00:21:19,200 --> 00:21:22,080
this thing here i actually have a prop

592
00:21:20,559 --> 00:21:23,440
of this because i happen to own this

593
00:21:22,080 --> 00:21:27,520
thing so it looks like this when it's

594
00:21:23,440 --> 00:21:30,400
when it's attached to a camera right um

595
00:21:27,520 --> 00:21:32,880
and this thing as you can see now that

596
00:21:30,400 --> 00:21:37,360
has if i hold it up to my face that has

597
00:21:32,880 --> 00:21:39,840
roughly the same distance as my eyes

598
00:21:37,360 --> 00:21:41,840
and um this is something that we call

599
00:21:39,840 --> 00:21:43,600
iso stereoscopic or roughly

600
00:21:41,840 --> 00:21:46,400
isosteroscopic

601
00:21:43,600 --> 00:21:48,320
so this thing here has a roughly 90

602
00:21:46,400 --> 00:21:51,200
millimeter distance stereoscopic

603
00:21:48,320 --> 00:21:53,200
distance um and that compares relatively

604
00:21:51,200 --> 00:21:56,640
well to the typical 70 millimeters that

605
00:21:53,200 --> 00:21:59,039
you have from from your eyes so

606
00:21:56,640 --> 00:22:00,559
pictures that you take with this sort of

607
00:21:59,039 --> 00:22:02,640
uh lens

608
00:22:00,559 --> 00:22:04,640
the depth effect will roughly match your

609
00:22:02,640 --> 00:22:05,919
natural stereo distance

610
00:22:04,640 --> 00:22:08,880
and then there's one other thing that

611
00:22:05,919 --> 00:22:10,880
you can use and uh those are

612
00:22:08,880 --> 00:22:12,559
mirror lens attachments

613
00:22:10,880 --> 00:22:14,559
so for example this thing this is called

614
00:22:12,559 --> 00:22:16,559
the cooler deeper

615
00:22:14,559 --> 00:22:17,760
and this is something it works through

616
00:22:16,559 --> 00:22:19,520
an arrangement of several mirrors

617
00:22:17,760 --> 00:22:22,000
they're all at 45 degree angles to the

618
00:22:19,520 --> 00:22:24,080
plane of the sensor so the light path is

619
00:22:22,000 --> 00:22:27,440
effectively deflected twice it's kind of

620
00:22:24,080 --> 00:22:30,240
like this this shape and um

621
00:22:27,440 --> 00:22:31,840
it offsets the light hitting uh the left

622
00:22:30,240 --> 00:22:33,600
half of your sense a little further to

623
00:22:31,840 --> 00:22:34,720
the left and offsets the light hitting

624
00:22:33,600 --> 00:22:37,679
the right half of your sensor a little

625
00:22:34,720 --> 00:22:40,640
further to the right and so that makes

626
00:22:37,679 --> 00:22:43,039
this device slightly hyper stereoscopic

627
00:22:40,640 --> 00:22:45,280
so if we have a stereoscopic distance

628
00:22:43,039 --> 00:22:47,520
that's larger than

629
00:22:45,280 --> 00:22:49,840
the distance between our pupils we call

630
00:22:47,520 --> 00:22:52,960
that hyper stereoscopic so in this case

631
00:22:49,840 --> 00:22:56,559
it's about 105 millimeters this by the

632
00:22:52,960 --> 00:22:58,080
way is really a design that's made for

633
00:22:56,559 --> 00:23:01,760
sort of full-frame

634
00:22:58,080 --> 00:23:04,320
dslrs uh it also has like another

635
00:23:01,760 --> 00:23:06,159
small version that you can clip onto

636
00:23:04,320 --> 00:23:09,200
your phone but this thing is very much

637
00:23:06,159 --> 00:23:12,080
made for sort of big dslrs

638
00:23:09,200 --> 00:23:14,640
but just like i can scarcely expect you

639
00:23:12,080 --> 00:23:17,039
to have a stereoscope in your possession

640
00:23:14,640 --> 00:23:19,120
or a stereoscopic polarized light

641
00:23:17,039 --> 00:23:22,000
projector i can scarcely expect you to

642
00:23:19,120 --> 00:23:24,080
have these devices in your possession if

643
00:23:22,000 --> 00:23:25,520
you want to get started with 3d

644
00:23:24,080 --> 00:23:28,080
stereoscopic

645
00:23:25,520 --> 00:23:30,240
photography and so because i of course

646
00:23:28,080 --> 00:23:33,760
want to get you interested in it i'm

647
00:23:30,240 --> 00:23:36,720
going to start talking about gadget free

648
00:23:33,760 --> 00:23:40,000
stereograms so stereograms that you can

649
00:23:36,720 --> 00:23:42,799
create with any regular camera

650
00:23:40,000 --> 00:23:45,120
so i'm about to show you a stereo

651
00:23:42,799 --> 00:23:47,679
photography technique that works with

652
00:23:45,120 --> 00:23:49,679
literally any digital camera at all so

653
00:23:47,679 --> 00:23:52,400
you can use your dslr you can use a

654
00:23:49,679 --> 00:23:55,520
point shoot camera you can use a gopro

655
00:23:52,400 --> 00:23:56,320
you can use your phone anything

656
00:23:55,520 --> 00:23:57,840
now

657
00:23:56,320 --> 00:23:59,120
i'll have to mention that this is a

658
00:23:57,840 --> 00:24:00,320
technique that doesn't work for candid

659
00:23:59,120 --> 00:24:02,480
shots and it doesn't work for action

660
00:24:00,320 --> 00:24:06,559
shots but you can make absolutely

661
00:24:02,480 --> 00:24:09,840
stunning 3d views of buildings and parks

662
00:24:06,559 --> 00:24:11,919
and statues and sculptures and

663
00:24:09,840 --> 00:24:13,600
landscapes and you can even do post

664
00:24:11,919 --> 00:24:15,520
portraits this way so if you have

665
00:24:13,600 --> 00:24:17,360
somebody that can actually sit for a

666
00:24:15,520 --> 00:24:19,760
portrait for you and can hold still for

667
00:24:17,360 --> 00:24:21,360
like 15 to 30 seconds then you can

668
00:24:19,760 --> 00:24:23,760
totally apply this technique to

669
00:24:21,360 --> 00:24:25,919
portraits as well

670
00:24:23,760 --> 00:24:27,840
and i have a small video uh for this

671
00:24:25,919 --> 00:24:29,440
that i'm going to narrate over

672
00:24:27,840 --> 00:24:31,600
so this is me

673
00:24:29,440 --> 00:24:33,679
in my backyard

674
00:24:31,600 --> 00:24:35,200
taking an image of this little garden

675
00:24:33,679 --> 00:24:38,240
ornament that you see and the technique

676
00:24:35,200 --> 00:24:40,000
is really simple i lean on my left foot

677
00:24:38,240 --> 00:24:42,799
so i've got all my weight on my left leg

678
00:24:40,000 --> 00:24:44,799
i snap a picture and then i move over i

679
00:24:42,799 --> 00:24:46,480
move my weight over to my right leg and

680
00:24:44,799 --> 00:24:48,720
snap another picture

681
00:24:46,480 --> 00:24:50,480
that's literally it right

682
00:24:48,720 --> 00:24:52,559
i'm going to give you this on a loop so

683
00:24:50,480 --> 00:24:55,520
you can see it a few times but it's like

684
00:24:52,559 --> 00:24:58,159
really really simple what you want to do

685
00:24:55,520 --> 00:25:00,000
weight on your left leg snap

686
00:24:58,159 --> 00:25:02,400
shift your weight over to your right leg

687
00:25:00,000 --> 00:25:04,400
snap and what that will create

688
00:25:02,400 --> 00:25:06,159
is two images

689
00:25:04,400 --> 00:25:08,159
that have a stereoscopic distance of

690
00:25:06,159 --> 00:25:11,360
about my shoulder width right so they're

691
00:25:08,159 --> 00:25:13,679
pretty solidly hyper stereoscopic even

692
00:25:11,360 --> 00:25:15,679
and if you want to uh take a look at how

693
00:25:13,679 --> 00:25:18,159
that works or how that looks from the

694
00:25:15,679 --> 00:25:20,720
camera this is a view

695
00:25:18,159 --> 00:25:22,559
of the android open camera app exactly

696
00:25:20,720 --> 00:25:23,679
the same thing right so i

697
00:25:22,559 --> 00:25:25,600
frame

698
00:25:23,679 --> 00:25:28,799
the shot with this little ornament in

699
00:25:25,600 --> 00:25:30,000
the center click and then i shift my

700
00:25:28,799 --> 00:25:32,159
weight over

701
00:25:30,000 --> 00:25:34,080
and the whole shot changes a great deal

702
00:25:32,159 --> 00:25:36,400
but the this garden ornament stays in

703
00:25:34,080 --> 00:25:39,200
the center click again

704
00:25:36,400 --> 00:25:41,840
and that's it right

705
00:25:39,200 --> 00:25:43,919
so that's how i create my source images

706
00:25:41,840 --> 00:25:45,600
very simple way to create stereoscopic

707
00:25:43,919 --> 00:25:47,120
images and now how do i turn those into

708
00:25:45,600 --> 00:25:48,799
a stereogram

709
00:25:47,120 --> 00:25:50,320
so we've got two images and now we want

710
00:25:48,799 --> 00:25:51,600
to make a stereogram out of that right

711
00:25:50,320 --> 00:25:53,520
they're not aligned they're not like

712
00:25:51,600 --> 00:25:56,159
whatever and we can do that in a few

713
00:25:53,520 --> 00:25:57,600
very simple steps and of course as

714
00:25:56,159 --> 00:25:59,600
everything as with everything else that

715
00:25:57,600 --> 00:26:01,200
i'm showcasing in this talk i'm using

716
00:25:59,600 --> 00:26:02,240
exclusively free and open source

717
00:26:01,200 --> 00:26:05,360
software

718
00:26:02,240 --> 00:26:08,320
so we're going to do this with the [ __ ]

719
00:26:05,360 --> 00:26:09,120
the canoe image manipulation program

720
00:26:08,320 --> 00:26:10,720
so

721
00:26:09,120 --> 00:26:14,000
what do i do here

722
00:26:10,720 --> 00:26:17,120
well i i've got my two images and i open

723
00:26:14,000 --> 00:26:18,799
them using the open as layers function

724
00:26:17,120 --> 00:26:21,039
in the [ __ ] right so that will simply

725
00:26:18,799 --> 00:26:22,159
create two layers created from these two

726
00:26:21,039 --> 00:26:24,480
images

727
00:26:22,159 --> 00:26:26,240
and now what i'm going to do is i'm

728
00:26:24,480 --> 00:26:29,039
going to rename my layers and i'm going

729
00:26:26,240 --> 00:26:31,520
to rename them left and right

730
00:26:29,039 --> 00:26:32,880
so that they reflect sort of

731
00:26:31,520 --> 00:26:34,960
you know what the view is and then what

732
00:26:32,880 --> 00:26:36,559
i'm going to do is i'm going to take my

733
00:26:34,960 --> 00:26:37,919
right

734
00:26:36,559 --> 00:26:39,840
layer the one that's currently in the

735
00:26:37,919 --> 00:26:42,799
foreground and i'm going to reduce its

736
00:26:39,840 --> 00:26:45,039
opacity to 50

737
00:26:42,799 --> 00:26:48,240
right so that's semi-transparent

738
00:26:45,039 --> 00:26:49,440
and now what i do is i use the [ __ ] move

739
00:26:48,240 --> 00:26:50,640
tool

740
00:26:49,440 --> 00:26:52,640
and

741
00:26:50,640 --> 00:26:53,840
what i want to do is i've got this

742
00:26:52,640 --> 00:26:55,760
little garden ornament that i've

743
00:26:53,840 --> 00:26:57,520
centered as sort of my focal point and

744
00:26:55,760 --> 00:26:59,120
my center of attention and what i want

745
00:26:57,520 --> 00:27:02,960
to do is i want

746
00:26:59,120 --> 00:27:04,480
the image to precisely overlap on that

747
00:27:02,960 --> 00:27:07,120
little ornament so i zoom in a little

748
00:27:04,480 --> 00:27:08,559
bit and i wiggle stuff around until it's

749
00:27:07,120 --> 00:27:10,240
just right

750
00:27:08,559 --> 00:27:11,679
such that i get full overlap on that

751
00:27:10,240 --> 00:27:13,279
little ornament

752
00:27:11,679 --> 00:27:14,880
right just there every everywhere else i

753
00:27:13,279 --> 00:27:16,480
don't care

754
00:27:14,880 --> 00:27:18,799
and then what i do is i do a simple

755
00:27:16,480 --> 00:27:20,799
rectangle select

756
00:27:18,799 --> 00:27:22,799
because now my my layers are only

757
00:27:20,799 --> 00:27:24,080
partially overlapping right and what i

758
00:27:22,799 --> 00:27:25,440
want to do is i want to select the

759
00:27:24,080 --> 00:27:27,600
portion where

760
00:27:25,440 --> 00:27:29,760
they overlap right and i do that with a

761
00:27:27,600 --> 00:27:31,760
simple freehand rectangle select i'm

762
00:27:29,760 --> 00:27:33,760
sure you can write a plugin or a script

763
00:27:31,760 --> 00:27:34,720
or something for that as well but i do a

764
00:27:33,760 --> 00:27:37,919
simple

765
00:27:34,720 --> 00:27:43,840
freehand rectangle select

766
00:27:37,919 --> 00:27:45,440
and once i have that i can use the image

767
00:27:43,840 --> 00:27:47,360
crop to selection option crop to

768
00:27:45,440 --> 00:27:49,679
selection cuts through all the layers

769
00:27:47,360 --> 00:27:51,679
and that means i now have layers that

770
00:27:49,679 --> 00:27:54,159
are exactly identically sized and then

771
00:27:51,679 --> 00:27:55,360
have this little garden ornament in

772
00:27:54,159 --> 00:27:57,760
the center or

773
00:27:55,360 --> 00:27:59,120
that point is is precisely overlapping

774
00:27:57,760 --> 00:28:01,120
and now i have to decide do i want to

775
00:27:59,120 --> 00:28:02,559
make a cross-eyed or a warlike image and

776
00:28:01,120 --> 00:28:05,600
i want to make a cross-side image so

777
00:28:02,559 --> 00:28:08,159
what i do now is i take the right layer

778
00:28:05,600 --> 00:28:10,000
and i move it to the left

779
00:28:08,159 --> 00:28:11,600
right and that creates my cross view

780
00:28:10,000 --> 00:28:13,440
image and then of course you know it's

781
00:28:11,600 --> 00:28:16,080
invisible so i have to resize my canvas

782
00:28:13,440 --> 00:28:17,919
to the layer sizes that's trivial and

783
00:28:16,080 --> 00:28:20,320
then i do one other thing

784
00:28:17,919 --> 00:28:22,640
i leave a little bit of a gap between

785
00:28:20,320 --> 00:28:24,880
and then i create um

786
00:28:22,640 --> 00:28:26,720
a single unique color layer i usually

787
00:28:24,880 --> 00:28:28,720
use white or black and then i put that

788
00:28:26,720 --> 00:28:30,320
into the background because what that

789
00:28:28,720 --> 00:28:32,720
does is it creates this little bar in

790
00:28:30,320 --> 00:28:34,720
the center and when viewing that kind of

791
00:28:32,720 --> 00:28:36,559
tends to nicely frame the image and

792
00:28:34,720 --> 00:28:38,480
guide the eyes right

793
00:28:36,559 --> 00:28:41,039
so that's my stereo my stereogram that

794
00:28:38,480 --> 00:28:45,360
i've created in just a few minutes of

795
00:28:41,039 --> 00:28:47,200
the [ __ ] and this is the result

796
00:28:45,360 --> 00:28:49,120
right so this is a cross-side stereogram

797
00:28:47,200 --> 00:28:51,440
again i'll leave this up for a few

798
00:28:49,120 --> 00:28:53,520
seconds admittedly this one is more

799
00:28:51,440 --> 00:28:56,080
difficult to do than the others because

800
00:28:53,520 --> 00:28:58,480
the background is a little busier

801
00:28:56,080 --> 00:29:01,360
but if you've

802
00:28:58,480 --> 00:29:03,520
managed to do a cross-eyed view of the

803
00:29:01,360 --> 00:29:05,919
image that i gave you earlier chances

804
00:29:03,520 --> 00:29:07,600
are that you're going to do fine with

805
00:29:05,919 --> 00:29:09,679
this one as well

806
00:29:07,600 --> 00:29:11,440
the only thing that you want to perhaps

807
00:29:09,679 --> 00:29:13,840
keep in mind is you want to keep your

808
00:29:11,440 --> 00:29:17,200
attention focused on this little orange

809
00:29:13,840 --> 00:29:20,240
glass bit of of that garden ornament

810
00:29:17,200 --> 00:29:22,320
so you can so you can focus on that

811
00:29:20,240 --> 00:29:24,399
and again i'm going to leave this up for

812
00:29:22,320 --> 00:29:26,640
a few more seconds

813
00:29:24,399 --> 00:29:30,320
and then hopefully what you're going to

814
00:29:26,640 --> 00:29:31,840
see is the depth differences between

815
00:29:30,320 --> 00:29:34,880
this little ornament

816
00:29:31,840 --> 00:29:37,600
and the lilies and the little

817
00:29:34,880 --> 00:29:39,120
maple tree that's growing there and uh

818
00:29:37,600 --> 00:29:42,320
and everything else and the fact that

819
00:29:39,120 --> 00:29:44,480
it's sort of staggered in in depth and

820
00:29:42,320 --> 00:29:46,159
and distance

821
00:29:44,480 --> 00:29:50,240
and that's how we create stereograms in

822
00:29:46,159 --> 00:29:50,240
just a few minutes in the [ __ ]

823
00:29:53,600 --> 00:29:57,120
all right

824
00:29:54,399 --> 00:30:00,559
on to something even more exciting

825
00:29:57,120 --> 00:30:03,679
stereoscopic motion picture aka 3d

826
00:30:00,559 --> 00:30:04,880
movies or motion stereograms so there's

827
00:30:03,679 --> 00:30:06,240
one thing that i think is probably

828
00:30:04,880 --> 00:30:07,760
self-evident right which is that

829
00:30:06,240 --> 00:30:10,159
everything that i talked about for still

830
00:30:07,760 --> 00:30:11,600
photography that relied on using special

831
00:30:10,159 --> 00:30:13,360
lenses or lens attachment or something

832
00:30:11,600 --> 00:30:16,240
like that all that also goes for for

833
00:30:13,360 --> 00:30:17,520
videography right because your dslr or

834
00:30:16,240 --> 00:30:19,600
any other camera including your phone

835
00:30:17,520 --> 00:30:22,480
really can do video just as well as

836
00:30:19,600 --> 00:30:23,919
still so if i if i use this

837
00:30:22,480 --> 00:30:26,799
just you know my regular camera which

838
00:30:23,919 --> 00:30:28,799
can of course do video and i attach this

839
00:30:26,799 --> 00:30:32,159
lens to it then

840
00:30:28,799 --> 00:30:33,120
i get 3d video from that right

841
00:30:32,159 --> 00:30:35,440
but

842
00:30:33,120 --> 00:30:37,600
i'd argue that most people today will be

843
00:30:35,440 --> 00:30:39,120
interested in using a different kind of

844
00:30:37,600 --> 00:30:41,919
camera for

845
00:30:39,120 --> 00:30:44,320
3d video namely a drone camera i don't

846
00:30:41,919 --> 00:30:45,840
know about you i love aerial videography

847
00:30:44,320 --> 00:30:48,399
i think it can be absolutely amazing to

848
00:30:45,840 --> 00:30:51,360
begin with and now imagine shooting

849
00:30:48,399 --> 00:30:52,960
aerial video that's stereoscopic right

850
00:30:51,360 --> 00:30:54,320
now of course what you could do is you

851
00:30:52,960 --> 00:30:56,399
could build your own drone perhaps

852
00:30:54,320 --> 00:30:58,559
something like a fixed wing uav that has

853
00:30:56,399 --> 00:31:00,399
a wingspan of two meters and it has a

854
00:30:58,559 --> 00:31:02,320
gopro embedded in each wing and that

855
00:31:00,399 --> 00:31:03,919
would result in sort of seriously hyper

856
00:31:02,320 --> 00:31:06,000
stereoscopic image and it will give you

857
00:31:03,919 --> 00:31:07,679
the impression or the feel of being

858
00:31:06,000 --> 00:31:10,159
something like a pteranodon science

859
00:31:07,679 --> 00:31:12,640
creature soaring over the earth

860
00:31:10,159 --> 00:31:14,799
but there's a few issues with that right

861
00:31:12,640 --> 00:31:15,600
one we're not all triggered

862
00:31:14,799 --> 00:31:18,080
two

863
00:31:15,600 --> 00:31:20,799
it would come at significant expense and

864
00:31:18,080 --> 00:31:23,279
three you'd need an airstrip for this

865
00:31:20,799 --> 00:31:26,000
whole thing to sort of take off from and

866
00:31:23,279 --> 00:31:27,600
land on right so that's perhaps a bit

867
00:31:26,000 --> 00:31:28,399
problematic

868
00:31:27,600 --> 00:31:29,679
but

869
00:31:28,399 --> 00:31:32,159
there's something very exciting that you

870
00:31:29,679 --> 00:31:34,159
can do you can totally get 3d footage

871
00:31:32,159 --> 00:31:35,760
with a single camera

872
00:31:34,159 --> 00:31:36,720
one that's mounted it could be mounted

873
00:31:35,760 --> 00:31:38,720
on your drum but it could also be

874
00:31:36,720 --> 00:31:40,720
mounted on your car your bicycle

875
00:31:38,720 --> 00:31:43,200
wherever so let me quickly explain the

876
00:31:40,720 --> 00:31:46,000
principle so you already know that any

877
00:31:43,200 --> 00:31:47,519
stereogram consists of a left eye and a

878
00:31:46,000 --> 00:31:49,840
right eye image and of course that also

879
00:31:47,519 --> 00:31:52,320
is true for a motion stereogram but i'm

880
00:31:49,840 --> 00:31:55,679
talking about having only one camera

881
00:31:52,320 --> 00:31:58,480
with only one lens right so imagine

882
00:31:55,679 --> 00:32:00,960
let's take this this gopro here right

883
00:31:58,480 --> 00:32:03,679
and i hold it up to my right eye

884
00:32:00,960 --> 00:32:05,279
right so that's my right eye view

885
00:32:03,679 --> 00:32:07,679
but if i have only one camera where's my

886
00:32:05,279 --> 00:32:11,760
corresponding left eye view

887
00:32:07,679 --> 00:32:13,120
well once i add some sideways motion

888
00:32:11,760 --> 00:32:15,120
right

889
00:32:13,120 --> 00:32:18,000
sideways motion relative to where my

890
00:32:15,120 --> 00:32:20,080
lens is pointed then you quickly realize

891
00:32:18,000 --> 00:32:22,799
that my left eye view is simply where my

892
00:32:20,080 --> 00:32:24,480
right eye view was a moment ago

893
00:32:22,799 --> 00:32:26,480
and we can harness that fact in video

894
00:32:24,480 --> 00:32:29,360
post production to create a 3d video

895
00:32:26,480 --> 00:32:32,640
from a 2d video just as long as it

896
00:32:29,360 --> 00:32:34,399
includes constant lateral motion

897
00:32:32,640 --> 00:32:37,120
so how do we do that

898
00:32:34,399 --> 00:32:39,679
right how do we harness sideways motion

899
00:32:37,120 --> 00:32:41,360
for a 3d effect there's a little bit of

900
00:32:39,679 --> 00:32:44,640
very simple maths that we need to do for

901
00:32:41,360 --> 00:32:47,200
that so suppose that we're shooting uh

902
00:32:44,640 --> 00:32:49,760
video at 50 frames per second right

903
00:32:47,200 --> 00:32:50,880
so that means that um

904
00:32:49,760 --> 00:32:53,200
we're

905
00:32:50,880 --> 00:32:54,399
every frame is 20 milliseconds in

906
00:32:53,200 --> 00:32:56,320
duration

907
00:32:54,399 --> 00:32:59,360
so therefore if we're moving

908
00:32:56,320 --> 00:33:01,200
perpendicular to the direction of view

909
00:32:59,360 --> 00:33:02,799
okay so the camera's pointed this way

910
00:33:01,200 --> 00:33:04,640
we're moving that way

911
00:33:02,799 --> 00:33:06,399
um and we're doing that at even one

912
00:33:04,640 --> 00:33:08,559
meter per second which is roughly the

913
00:33:06,399 --> 00:33:09,760
speed of a leisurely walk and of course

914
00:33:08,559 --> 00:33:12,320
also means that we're moving in one

915
00:33:09,760 --> 00:33:15,039
millimeter per millisecond right so that

916
00:33:12,320 --> 00:33:17,600
means that one frame covers about 20

917
00:33:15,039 --> 00:33:20,399
millimeters in sideways motion

918
00:33:17,600 --> 00:33:22,559
so therefore if we duplicate our stream

919
00:33:20,399 --> 00:33:24,799
and put the two stream copies side by

920
00:33:22,559 --> 00:33:25,840
side and then offset one of them by four

921
00:33:24,799 --> 00:33:27,840
frames

922
00:33:25,840 --> 00:33:29,600
or 80 milliseconds

923
00:33:27,840 --> 00:33:31,120
then what we've effectively achieved is

924
00:33:29,600 --> 00:33:32,399
a stereoscopic distance of 80

925
00:33:31,120 --> 00:33:33,120
millimeters

926
00:33:32,399 --> 00:33:34,960
and

927
00:33:33,120 --> 00:33:36,559
our pupils are 70 millimeters apart so

928
00:33:34,960 --> 00:33:39,200
that's nicely

929
00:33:36,559 --> 00:33:42,320
iso stereoscopic

930
00:33:39,200 --> 00:33:43,360
if we go a step further and uh

931
00:33:42,320 --> 00:33:44,720
we

932
00:33:43,360 --> 00:33:46,399
uh

933
00:33:44,720 --> 00:33:48,159
make with we're thinking about an object

934
00:33:46,399 --> 00:33:51,120
that goes a little faster so say for

935
00:33:48,159 --> 00:33:53,519
example a drone right or a bicycle or

936
00:33:51,120 --> 00:33:55,519
something like that a car is easy

937
00:33:53,519 --> 00:33:57,679
but any any of those can achieve 10

938
00:33:55,519 --> 00:34:00,640
meters per second right

939
00:33:57,679 --> 00:34:03,039
or 36 kilometers an hour um

940
00:34:00,640 --> 00:34:04,960
so when you do that then even a single

941
00:34:03,039 --> 00:34:07,200
frame offset gives you a stereoscopic

942
00:34:04,960 --> 00:34:08,879
distance of 200 millimeters right which

943
00:34:07,200 --> 00:34:11,040
already makes the video solidly hyper

944
00:34:08,879 --> 00:34:12,560
stereoscopic and if you use for example

945
00:34:11,040 --> 00:34:14,560
a five frame offset it gives you a nice

946
00:34:12,560 --> 00:34:17,040
giant's eye view with like a one meter

947
00:34:14,560 --> 00:34:18,639
stereo distance and this becomes

948
00:34:17,040 --> 00:34:22,320
especially interesting when you're

949
00:34:18,639 --> 00:34:24,240
either doing a linear drone flight along

950
00:34:22,320 --> 00:34:26,159
a roughly linear feature so say for

951
00:34:24,240 --> 00:34:28,480
example you're tracking a coastline

952
00:34:26,159 --> 00:34:31,119
or you're doing orbital flight around an

953
00:34:28,480 --> 00:34:32,800
object right so ideally one with where

954
00:34:31,119 --> 00:34:36,000
you're orbiting above

955
00:34:32,800 --> 00:34:37,760
and your camera is is tilted slightly

956
00:34:36,000 --> 00:34:40,560
downward

957
00:34:37,760 --> 00:34:42,800
and i've got an example of the former of

958
00:34:40,560 --> 00:34:45,599
these two so what you see here

959
00:34:42,800 --> 00:34:48,399
is a drone flight sequence that's shot

960
00:34:45,599 --> 00:34:50,159
at 30 frames per second with the camera

961
00:34:48,399 --> 00:34:52,000
pointing forwards and the drone flying

962
00:34:50,159 --> 00:34:54,960
sideways

963
00:34:52,000 --> 00:34:58,160
um and it's going to the right and it's

964
00:34:54,960 --> 00:35:01,839
going at approximately 40 kilometers an

965
00:34:58,160 --> 00:35:04,079
hour or 11.1 meters per second right or

966
00:35:01,839 --> 00:35:05,359
put differently uh this is buffering a

967
00:35:04,079 --> 00:35:06,480
little bit but

968
00:35:05,359 --> 00:35:08,880
you can

969
00:35:06,480 --> 00:35:10,800
follow the um you can follow the video

970
00:35:08,880 --> 00:35:12,720
stream in the in the slide link that we

971
00:35:10,800 --> 00:35:15,040
uh shared at the top of the talk so

972
00:35:12,720 --> 00:35:18,560
anyhow um

973
00:35:15,040 --> 00:35:19,920
the we're going uh sideways at 11.1

974
00:35:18,560 --> 00:35:21,599
meters per second

975
00:35:19,920 --> 00:35:22,960
camera is pointing forwards put

976
00:35:21,599 --> 00:35:24,480
differently drones flying forwards at

977
00:35:22,960 --> 00:35:25,920
11.1 meters per second camera is

978
00:35:24,480 --> 00:35:28,960
pointing 90 degrees to the left it's

979
00:35:25,920 --> 00:35:30,960
exactly the same thing so and i it bears

980
00:35:28,960 --> 00:35:32,960
mentioning that um the camera doesn't

981
00:35:30,960 --> 00:35:35,280
need to be pointed at a 90 degree angle

982
00:35:32,960 --> 00:35:37,040
versus the heading of flight uh we could

983
00:35:35,280 --> 00:35:38,800
also for example be pointing the camera

984
00:35:37,040 --> 00:35:40,720
directly short and then fly at the beach

985
00:35:38,800 --> 00:35:43,359
at a 45 degree angle but what matters is

986
00:35:40,720 --> 00:35:45,359
that we have some lateral motion and

987
00:35:43,359 --> 00:35:47,680
that we're able to quantify it which

988
00:35:45,359 --> 00:35:50,800
which saves us some guesswork

989
00:35:47,680 --> 00:35:52,720
so every time every 90 milliseconds

990
00:35:50,800 --> 00:35:54,320
the camera is laterally displaced one

991
00:35:52,720 --> 00:35:56,320
meter and that's a nice hyper

992
00:35:54,320 --> 00:35:59,200
stereoscopic distance that we can work

993
00:35:56,320 --> 00:36:00,800
with in this panoramic shot so how do we

994
00:35:59,200 --> 00:36:03,280
turn this into

995
00:36:00,800 --> 00:36:04,720
a 3d movie

996
00:36:03,280 --> 00:36:06,240
again

997
00:36:04,720 --> 00:36:08,400
wonderful open source software to the

998
00:36:06,240 --> 00:36:10,000
rescue this is my favorite video editor

999
00:36:08,400 --> 00:36:12,079
happens to be shortcut

1000
00:36:10,000 --> 00:36:14,160
and what you see here is i've got the

1001
00:36:12,079 --> 00:36:16,400
same video opened twice in shortcut in

1002
00:36:14,160 --> 00:36:18,160
my playlist that's just a ux quirk in

1003
00:36:16,400 --> 00:36:20,400
shortcut um

1004
00:36:18,160 --> 00:36:21,680
i need to do it this way because there's

1005
00:36:20,400 --> 00:36:23,839
certain things that i can't do with one

1006
00:36:21,680 --> 00:36:26,560
of them never mind it's exactly the same

1007
00:36:23,839 --> 00:36:28,720
the same sequence so what i'm doing is

1008
00:36:26,560 --> 00:36:30,720
i'm adding a video track

1009
00:36:28,720 --> 00:36:32,720
for the left eye image

1010
00:36:30,720 --> 00:36:34,560
and note we're again going to be making

1011
00:36:32,720 --> 00:36:36,160
a cross view video so this image will

1012
00:36:34,560 --> 00:36:38,160
actually end up on the right so i'm

1013
00:36:36,160 --> 00:36:39,599
pulling this clip down into into the

1014
00:36:38,160 --> 00:36:43,280
track here

1015
00:36:39,599 --> 00:36:45,760
and then what i'll do is i'll apply two

1016
00:36:43,280 --> 00:36:48,320
filters very simple filters so the first

1017
00:36:45,760 --> 00:36:51,040
one is a crop filter

1018
00:36:48,320 --> 00:36:53,440
and what i want to do is i want to sort

1019
00:36:51,040 --> 00:36:55,280
of extract out of this

1020
00:36:53,440 --> 00:36:56,960
widescreen view i want to extract sort

1021
00:36:55,280 --> 00:36:58,480
of just the middle bit

1022
00:36:56,960 --> 00:37:00,480
and so therefore

1023
00:36:58,480 --> 00:37:01,760
what i'm going to do is i'm going to

1024
00:37:00,480 --> 00:37:06,079
take a crop

1025
00:37:01,760 --> 00:37:10,079
of half the width of the whole frame

1026
00:37:06,079 --> 00:37:14,720
so it has an original width of 2704 so

1027
00:37:10,079 --> 00:37:17,760
i'm going to drop it to our 1352

1028
00:37:14,720 --> 00:37:21,560
in width so 1352 pixels and of course

1029
00:37:17,760 --> 00:37:21,560
the height stays unchanged

1030
00:37:22,400 --> 00:37:25,440
and then what i'll also do is i'll

1031
00:37:24,400 --> 00:37:26,560
offset my crop

1032
00:37:25,440 --> 00:37:29,839
[Music]

1033
00:37:26,560 --> 00:37:32,560
by one quarter of the image width so

1034
00:37:29,839 --> 00:37:34,480
that's 776 pixels that you see here so

1035
00:37:32,560 --> 00:37:36,560
what we're chopping out we're taking out

1036
00:37:34,480 --> 00:37:38,960
sort of the left and the right side and

1037
00:37:36,560 --> 00:37:40,560
we're just leaving the middle

1038
00:37:38,960 --> 00:37:42,640
okay and now what i'm going to do is i'm

1039
00:37:40,560 --> 00:37:44,160
going to use a position filter to move

1040
00:37:42,640 --> 00:37:46,160
this cropped

1041
00:37:44,160 --> 00:37:48,160
frame

1042
00:37:46,160 --> 00:37:50,320
all the way over to the

1043
00:37:48,160 --> 00:37:52,320
right all right it's the left eye image

1044
00:37:50,320 --> 00:37:55,520
it moves over to the right because we're

1045
00:37:52,320 --> 00:37:57,839
building a cross view video

1046
00:37:55,520 --> 00:37:59,440
all right so

1047
00:37:57,839 --> 00:38:01,200
that's

1048
00:37:59,440 --> 00:38:04,320
the left eye image

1049
00:38:01,200 --> 00:38:06,800
now add a second track pull the exact

1050
00:38:04,320 --> 00:38:09,520
same video into that track

1051
00:38:06,800 --> 00:38:14,320
and then we're also going to be doing a

1052
00:38:09,520 --> 00:38:14,320
little bit of play with filters

1053
00:38:16,079 --> 00:38:20,320
so there we go we're pulling that down

1054
00:38:18,400 --> 00:38:22,880
uh into our track at this point it's

1055
00:38:20,320 --> 00:38:25,280
it's identically aligned and now uh

1056
00:38:22,880 --> 00:38:28,160
we're applying the same filters

1057
00:38:25,280 --> 00:38:29,520
so first a crop filter the crop filter

1058
00:38:28,160 --> 00:38:31,520
is going to use exactly the same

1059
00:38:29,520 --> 00:38:32,960
parameters as

1060
00:38:31,520 --> 00:38:36,000
with the

1061
00:38:32,960 --> 00:38:40,320
left eye image so we're going to

1062
00:38:36,000 --> 00:38:42,320
reduce its size its width to 1352

1063
00:38:40,320 --> 00:38:44,320
and we're going to

1064
00:38:42,320 --> 00:38:47,200
use the middle portion so we're going to

1065
00:38:44,320 --> 00:38:49,280
offset this by 776 but now i do

1066
00:38:47,200 --> 00:38:50,960
something i do the reverse of what i did

1067
00:38:49,280 --> 00:38:53,960
earlier with the position filter with

1068
00:38:50,960 --> 00:38:57,280
the position filter i now use a negative

1069
00:38:53,960 --> 00:38:59,440
776 pixel offset so that this thing

1070
00:38:57,280 --> 00:39:00,480
moves to the left gets jammed over to

1071
00:38:59,440 --> 00:39:02,800
the left

1072
00:39:00,480 --> 00:39:04,240
uh the left edge of the frame and then

1073
00:39:02,800 --> 00:39:06,400
there's one tiny little thing that i

1074
00:39:04,240 --> 00:39:08,800
need to do i have this bar here that

1075
00:39:06,400 --> 00:39:11,040
overlaps and of course i don't want that

1076
00:39:08,800 --> 00:39:12,240
so uh what i'll do is i'll change the

1077
00:39:11,040 --> 00:39:15,040
blend mode

1078
00:39:12,240 --> 00:39:17,359
to add and there we go so now we've got

1079
00:39:15,040 --> 00:39:19,760
the two images side by side

1080
00:39:17,359 --> 00:39:23,520
and now comes the magic right so now

1081
00:39:19,760 --> 00:39:25,040
what we do is we take one of our one of

1082
00:39:23,520 --> 00:39:26,880
our tracks

1083
00:39:25,040 --> 00:39:31,040
and we offset it

1084
00:39:26,880 --> 00:39:32,960
by 90 milliseconds versus the other

1085
00:39:31,040 --> 00:39:34,880
all right and so what i'll do here is

1086
00:39:32,960 --> 00:39:36,800
this takes me a little bit of fiddling

1087
00:39:34,880 --> 00:39:38,960
because at the time when i uh when i

1088
00:39:36,800 --> 00:39:41,359
screen capped this i didn't know the

1089
00:39:38,960 --> 00:39:43,440
shortcut yet to make this happen in

1090
00:39:41,359 --> 00:39:45,119
shortcut so forgive me for that so i'm

1091
00:39:43,440 --> 00:39:47,079
just positioning the playhead i'm

1092
00:39:45,119 --> 00:39:50,160
roughly eyeballing this to

1093
00:39:47,079 --> 00:39:51,359
.09 seconds

1094
00:39:50,160 --> 00:39:53,280
and then

1095
00:39:51,359 --> 00:39:55,119
once i found that which like i said took

1096
00:39:53,280 --> 00:39:57,599
me a few tries

1097
00:39:55,119 --> 00:40:02,640
i can

1098
00:39:57,599 --> 00:40:02,640
move and then split my tracks

1099
00:40:04,400 --> 00:40:07,400
so

1100
00:40:11,119 --> 00:40:14,960
so there we go now we're moving that one

1101
00:40:12,880 --> 00:40:16,880
track by that offset

1102
00:40:14,960 --> 00:40:18,160
and now everything else that remains is

1103
00:40:16,880 --> 00:40:20,319
just trimming

1104
00:40:18,160 --> 00:40:22,079
right we're trimming a little bit at the

1105
00:40:20,319 --> 00:40:24,240
at the start and we're trimming a little

1106
00:40:22,079 --> 00:40:25,760
bit at the back and then we're moving

1107
00:40:24,240 --> 00:40:27,680
everything back to

1108
00:40:25,760 --> 00:40:31,040
this to to the beginning of the track to

1109
00:40:27,680 --> 00:40:31,040
the start of the track to the zero mark

1110
00:40:31,520 --> 00:40:35,520
okay so there we go

1111
00:40:33,680 --> 00:40:39,839
i just find another spot here with the

1112
00:40:35,520 --> 00:40:39,839
playhead again i completely eyeball this

1113
00:40:40,240 --> 00:40:45,160
and i split

1114
00:40:41,839 --> 00:40:45,160
and i trim

1115
00:40:54,160 --> 00:41:01,720
and now that that's done i just move

1116
00:40:56,640 --> 00:41:01,720
everything to the start of the track

1117
00:41:10,640 --> 00:41:14,480
and that's it

1118
00:41:12,160 --> 00:41:18,480
and now we can render this thing

1119
00:41:14,480 --> 00:41:18,480
and we end up with

1120
00:41:19,760 --> 00:41:22,800
a 3d video

1121
00:41:21,680 --> 00:41:25,040
all right

1122
00:41:22,800 --> 00:41:27,359
so again this is exactly the same

1123
00:41:25,040 --> 00:41:29,200
principle you cross your eyes

1124
00:41:27,359 --> 00:41:31,839
you let them wander out a little bit and

1125
00:41:29,200 --> 00:41:33,200
you wait for them to click into place

1126
00:41:31,839 --> 00:41:34,800
right again if you're watching the

1127
00:41:33,200 --> 00:41:37,359
recording or maybe you're watching the

1128
00:41:34,800 --> 00:41:40,000
original on on youtube you probably want

1129
00:41:37,359 --> 00:41:42,800
to pause the stream at some point and

1130
00:41:40,000 --> 00:41:44,720
just find your find your spot at the

1131
00:41:42,800 --> 00:41:46,480
very beginning of that loop there's a

1132
00:41:44,720 --> 00:41:48,480
house in the middle that kind of lends

1133
00:41:46,480 --> 00:41:50,480
itself to being a nice little focal

1134
00:41:48,480 --> 00:41:52,400
point

1135
00:41:50,480 --> 00:41:54,560
and i'll give you this on a loop here a

1136
00:41:52,400 --> 00:41:57,520
few times as well

1137
00:41:54,560 --> 00:42:00,079
i realize it's probably a little bit

1138
00:41:57,520 --> 00:42:02,800
jerky right now like i said you've got

1139
00:42:00,079 --> 00:42:05,599
all the links available and you can look

1140
00:42:02,800 --> 00:42:08,480
at the original footage but in principle

1141
00:42:05,599 --> 00:42:10,160
this works exactly the same way as a

1142
00:42:08,480 --> 00:42:12,800
stereo photograph

1143
00:42:10,160 --> 00:42:14,560
and once you get the hang of it it's

1144
00:42:12,800 --> 00:42:16,560
really nice because in this case you

1145
00:42:14,560 --> 00:42:18,240
sort of see how

1146
00:42:16,560 --> 00:42:20,160
there's like different layers of depth

1147
00:42:18,240 --> 00:42:22,319
in the jungle that are staggered uh

1148
00:42:20,160 --> 00:42:23,280
there's houses kind of like in between

1149
00:42:22,319 --> 00:42:24,960
there

1150
00:42:23,280 --> 00:42:26,720
and and they are all at like different

1151
00:42:24,960 --> 00:42:28,160
depths there's two ridge lines in the

1152
00:42:26,720 --> 00:42:30,400
back actually three ridge lines in the

1153
00:42:28,160 --> 00:42:33,280
background and you kind of nicely see

1154
00:42:30,400 --> 00:42:35,359
the relative depth of those and and so

1155
00:42:33,280 --> 00:42:37,280
on and it's it's it's pretty neat uh

1156
00:42:35,359 --> 00:42:39,440
when it turns out that way and that's

1157
00:42:37,280 --> 00:42:41,440
how we get 3d footage of flying along a

1158
00:42:39,440 --> 00:42:45,520
brazilian beach with a view of the

1159
00:42:41,440 --> 00:42:46,319
jungle with just a single camera

1160
00:42:45,520 --> 00:42:48,000
now

1161
00:42:46,319 --> 00:42:50,720
uh with that

1162
00:42:48,000 --> 00:42:53,599
i hope i've peaked your curiosity for

1163
00:42:50,720 --> 00:42:54,640
stereoscopic photography

1164
00:42:53,599 --> 00:42:57,040
a little bit

1165
00:42:54,640 --> 00:42:59,359
and i'll have a few more stereo images

1166
00:42:57,040 --> 00:43:01,440
here to close out the talk for those of

1167
00:42:59,359 --> 00:43:02,720
you who have already mastered the art of

1168
00:43:01,440 --> 00:43:04,880
cross site previewing these will

1169
00:43:02,720 --> 00:43:07,200
probably be a breeze

1170
00:43:04,880 --> 00:43:08,079
so this here is a shot

1171
00:43:07,200 --> 00:43:10,400
of

1172
00:43:08,079 --> 00:43:13,359
reconstructed roman baths in what used

1173
00:43:10,400 --> 00:43:15,839
to be the capital of uh the roman

1174
00:43:13,359 --> 00:43:18,240
province of pannonia superior in

1175
00:43:15,839 --> 00:43:20,800
kanuntum uh today this is about a 45

1176
00:43:18,240 --> 00:43:23,040
minute drive away from

1177
00:43:20,800 --> 00:43:24,400
vienna 45 minute drive east of vienna

1178
00:43:23,040 --> 00:43:26,640
approximately

1179
00:43:24,400 --> 00:43:28,480
and that gives you uh when when that

1180
00:43:26,640 --> 00:43:30,319
clicks into place that also gives you

1181
00:43:28,480 --> 00:43:32,079
sort of a nice view of the relative

1182
00:43:30,319 --> 00:43:34,240
depth of the buildings there's these

1183
00:43:32,079 --> 00:43:36,880
neatly trimmed bushes in front uh

1184
00:43:34,240 --> 00:43:39,040
there's some trees in the background

1185
00:43:36,880 --> 00:43:40,480
uh and so on

1186
00:43:39,040 --> 00:43:44,560
uh here's

1187
00:43:40,480 --> 00:43:44,560
another image coming up now

1188
00:43:44,960 --> 00:43:48,079
that apparently takes a little bit to

1189
00:43:46,800 --> 00:43:50,480
load

1190
00:43:48,079 --> 00:43:53,480
for some reason and i'm not really sure

1191
00:43:50,480 --> 00:43:53,480
why

1192
00:43:54,240 --> 00:44:00,000
that's great florian i'm just imagining

1193
00:43:57,200 --> 00:44:02,640
this talk in real life uh at the

1194
00:44:00,000 --> 00:44:04,400
conference and a room full of lca is

1195
00:44:02,640 --> 00:44:05,839
stumbling around during the broom

1196
00:44:04,400 --> 00:44:08,960
changeover

1197
00:44:05,839 --> 00:44:11,599
trying to uncross eye themselves

1198
00:44:08,960 --> 00:44:14,640
um we do have one question from the chat

1199
00:44:11,599 --> 00:44:16,960
if you've got got a moment to take it

1200
00:44:14,640 --> 00:44:18,960
um have you tried using any of the

1201
00:44:16,960 --> 00:44:23,200
various vr headsets that are in the

1202
00:44:18,960 --> 00:44:24,960
market as a stereogram viewer

1203
00:44:23,200 --> 00:44:26,640
i have not

1204
00:44:24,960 --> 00:44:28,240
but in principle

1205
00:44:26,640 --> 00:44:29,760
and i have another version of this talk

1206
00:44:28,240 --> 00:44:31,119
in which i mentioned this so basically a

1207
00:44:29,760 --> 00:44:33,040
vr goggle

1208
00:44:31,119 --> 00:44:35,599
works very much the same way as a

1209
00:44:33,040 --> 00:44:38,000
stereoscope like this except that rather

1210
00:44:35,599 --> 00:44:40,640
than putting a photograph an image in

1211
00:44:38,000 --> 00:44:42,000
here um you've got two screens right so

1212
00:44:40,640 --> 00:44:44,000
in principle it's it's pretty much the

1213
00:44:42,000 --> 00:44:46,560
same thing no i have not used it like i

1214
00:44:44,000 --> 00:44:48,640
said like for me this is uh i mean yes i

1215
00:44:46,560 --> 00:44:52,400
use all these digital tools and whatnot

1216
00:44:48,640 --> 00:44:54,079
but for me viewing this uh is sort of a

1217
00:44:52,400 --> 00:44:56,480
low-tech hobby i want to i want to put

1218
00:44:54,079 --> 00:44:59,040
this stuff sort of on my wall and and be

1219
00:44:56,480 --> 00:45:01,119
able to to look at that um i know we're

1220
00:44:59,040 --> 00:45:03,599
almost out of time i do want to mention

1221
00:45:01,119 --> 00:45:06,240
uh just a couple of more things because

1222
00:45:03,599 --> 00:45:08,160
they're important um i my twitter handle

1223
00:45:06,240 --> 00:45:10,720
was already sort of all over this talk

1224
00:45:08,160 --> 00:45:12,720
um if you do engage in this sort of

1225
00:45:10,720 --> 00:45:15,119
thing please tag me i'd love to see your

1226
00:45:12,720 --> 00:45:17,359
stereo images and uh there's another

1227
00:45:15,119 --> 00:45:20,800
thing that i do want to say which is a

1228
00:45:17,359 --> 00:45:23,440
special thanks to my former colleague

1229
00:45:20,800 --> 00:45:24,480
adolfo branches who took the drone

1230
00:45:23,440 --> 00:45:26,560
footage

1231
00:45:24,480 --> 00:45:29,200
from the brazilian beach and gave me

1232
00:45:26,560 --> 00:45:30,079
permission to use it and i also have a

1233
00:45:29,200 --> 00:45:32,720
few

1234
00:45:30,079 --> 00:45:35,200
creative commons image credits to share

1235
00:45:32,720 --> 00:45:37,599
at the end of the talk do we have any

1236
00:45:35,200 --> 00:45:40,000
more questions

1237
00:45:37,599 --> 00:45:42,240
uh yep we have one more how does this

1238
00:45:40,000 --> 00:45:43,760
relate to magikai books from back in the

1239
00:45:42,240 --> 00:45:46,960
day

1240
00:45:43,760 --> 00:45:48,480
magic ibooks are called auto stereograms

1241
00:45:46,960 --> 00:45:50,079
so

1242
00:45:48,480 --> 00:45:51,760
that's um

1243
00:45:50,079 --> 00:45:54,640
yeah i mean

1244
00:45:51,760 --> 00:45:57,359
that's also it's it simply creates the

1245
00:45:54,640 --> 00:46:00,000
illusion of depth in a different way

1246
00:45:57,359 --> 00:46:01,760
namely by using these actually they're

1247
00:46:00,000 --> 00:46:03,760
probably called random dot stereograms

1248
00:46:01,760 --> 00:46:05,359
so anything that you can free view is

1249
00:46:03,760 --> 00:46:07,599
essentially an autostereogram pretty

1250
00:46:05,359 --> 00:46:10,560
much um and those are called random dot

1251
00:46:07,599 --> 00:46:11,680
stereograms so yes it's pretty much

1252
00:46:10,560 --> 00:46:14,240
similar

1253
00:46:11,680 --> 00:46:16,480
it just yeah it just doesn't come off

1254
00:46:14,240 --> 00:46:18,880
sort of the living object right but it's

1255
00:46:16,480 --> 00:46:21,520
but it's generated there's also people

1256
00:46:18,880 --> 00:46:24,480
that do things like taking

1257
00:46:21,520 --> 00:46:26,000
uh letting [ __ ] build depth maps from

1258
00:46:24,480 --> 00:46:27,440
two different

1259
00:46:26,000 --> 00:46:29,440
uh views

1260
00:46:27,440 --> 00:46:31,520
left eye and right eye views of an image

1261
00:46:29,440 --> 00:46:33,040
and then creating random dot stereograms

1262
00:46:31,520 --> 00:46:34,960
from that but that is something that i

1263
00:46:33,040 --> 00:46:37,119
just know exists i haven't dabbled in it

1264
00:46:34,960 --> 00:46:39,599
i don't know anything about this uh but

1265
00:46:37,119 --> 00:46:40,880
yeah it's it's something uh

1266
00:46:39,599 --> 00:46:42,640
well it was brilliant thank you very

1267
00:46:40,880 --> 00:46:44,800
much um

1268
00:46:42,640 --> 00:46:46,160
thank you actual feedback was really

1269
00:46:44,800 --> 00:46:48,640
good from the chat really good

1270
00:46:46,160 --> 00:46:50,800
engagement everyone was trying out the

1271
00:46:48,640 --> 00:46:53,599
the cross side and different methods it

1272
00:46:50,800 --> 00:46:55,200
was great okay thank you and now we'll

1273
00:46:53,599 --> 00:46:56,800
be back in 10 minutes after the room

1274
00:46:55,200 --> 00:46:58,640
changeover

1275
00:46:56,800 --> 00:47:01,359
so thank you once again florian and

1276
00:46:58,640 --> 00:47:02,960
we'll see you hopefully at the next lca

1277
00:47:01,359 --> 00:47:04,480
yes exactly stay safe and healthy

1278
00:47:02,960 --> 00:47:07,880
everybody and i hope to see you next

1279
00:47:04,480 --> 00:47:07,880
year cheers