com.pixelmed.dicom
Class ModalityTransform

java.lang.Object
  com.pixelmed.dicom.ModalityTransform

public class ModalityTransform
extends Object

A transformation constructed from a DICOM attribute list that extracts those attributes that define the Modality LUT transformation, specifically the window center and width attributes.

Looks first for a per-frame functional group PixelValueTransformationSequence then looks in the shared functional groups, otherwise tries to find the Rescale Slope and Intercept values in the top level of the dataset.

Note that multiple transformations (for the same frames) are not permitted by the standard.

Does not currently support a LUT in the Modality LUT Sequence, only linear rescale values.

Will default to identity transformation if none present, or if there is an error in what is present (e.g., rescale slope is zerp).

Constructor Summary

ModalityTransform(AttributeList list)

Method Summary

double	getRescaleIntercept(int frame) Get the rescale intercept of the particular transform available for a particular frame.
double	getRescaleSlope(int frame) Get the rescale slope of the particular transform available for a particular frame.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ModalityTransform

public ModalityTransform(AttributeList list)

Parameters:

list - the dataset of an image object to be searched for transformations

Method Detail

getRescaleSlope

public double getRescaleSlope(int frame)

Get the rescale slope of the particular transform available for a particular frame.

Parameters:

frame - numbered from zero; needed to select which transform if frame-specific

Returns:

the rescale slope (1.0 if none available)

getRescaleIntercept

public double getRescaleIntercept(int frame)

Get the rescale intercept of the particular transform available for a particular frame.

Parameters:

frame - numbered from zero; needed to select which transform if frame-specific

Returns:

the rescale intercept (0.0 if none available)