#include <SSDImageSimilarity.h>

Inheritance diagram for SSDImageSimilarity:

Collaboration diagram for SSDImageSimilarity:

Public Types
typedef float	PrecisionType

Public Member Functions
	SSDImageSimilarity ()

	~SSDImageSimilarity ()

double	GetSimilarityMeasureValueForImages (nifti_image source, nifti_image reference)

virtual void	GetSimilarityGradientWRTVoxels (nifti_image referenceImg, nifti_image sourceImg, nifti_image *similarityGradientWRTVoxelsOutputImage)

virtual double	GetSimilarityMeasureValueForImages (nifti_image img1In, nifti_image img2In)=0

virtual void	GetSimilarityGradientWRTVoxels (nifti_image referenceImg, nifti_image sourceImg, nifti_image *similarityGradientWRTVoxelsOutputImage)=0

Private Member Functions
double	GetSSDValue (nifti_image referenceImage, nifti_image sourceImage)

Detailed Description

Class to calculate the sum-of-squared-differences (SSD) image similarity value and gradient.

Member Typedef Documentation

◆ PrecisionType

typedef float SSDImageSimilarity::PrecisionType

Constructor & Destructor Documentation

◆ SSDImageSimilarity()

SSDImageSimilarity::SSDImageSimilarity ( )

Constructor.

◆ ~SSDImageSimilarity()

SSDImageSimilarity::~SSDImageSimilarity ( )

Destructor.

Member Function Documentation

◆ GetSimilarityGradientWRTVoxels()

void SSDImageSimilarity::GetSimilarityGradientWRTVoxels	(	nifti_image *	referenceImg,
		nifti_image *	sourceImg,
		nifti_image *	similarityGradientWRTVoxelsOutputImage
	)

virtual

Calculates and returns the gradient of the image similarity measure with respect to the voxel intensities. Unlike SSDImageSimilarity::GetSimilarityMeasureValueForImages this funciton is not symmetric. Here \( \frac{\partial \mathcal{S}_t}{\mathbf{P}_{A_t}}\) is calculated, which for SSD is given by

\[ \frac{ \partial \mathcal{S} }{ \partial p_{A_t ,y} } = -2\left( p_{A_t ,y} - \partial p_{t ,y} \right) \]

calculated at each voxel.

Parameters

referenceImg	Nifti image pointer to the reference image. In the case of the unified registration framework it is the actual dynamic image \( \mathbf{P}_{t} \).
sourceImg	Nifti image pointer to the source image. In the case of the unified registration framework it is the simulated dynamic image \( \mathbf{P}_{A_t} \).
similarityGradientWRTVoxelsOutputImage	Nifti image of the same size/geometry of the sourceImg and referenceImg that is used to recieve the gradient image. Purposely not a member of this class.

Todo:: Decide how to deal with multiple time points in images

Implements ImageSimilarity.

◆ GetSimilarityMeasureValueForImages()

double SSDImageSimilarity::GetSimilarityMeasureValueForImages	(	nifti_image *	source,
		nifti_image *	reference
	)

virtual

Measures and returns the image similarity \( S(\mathbf{P}_t, \mathbf{P}_{A_t}) \) between two images.

Todo:: Perform checks that images are of equal size, and equal data type (equal geometry?)

Implements ImageSimilarity.

◆ GetSSDValue()

double SSDImageSimilarity::GetSSDValue	(	nifti_image *	referenceImage,
		nifti_image *	sourceImage
	)

private

The documentation for this class was generated from the following files:

motion-lib/SSDImageSimilarity.h
motion-lib/SSDImageSimilarity.cpp

Public Types

Public Member Functions

Private Member Functions