itk::ImageHelper< VImageDimension, VLoop > Class Template Reference

#include <itkImageHelper.h>

Detailed Description

template<unsigned int VImageDimension, unsigned int VLoop>
class itk::ImageHelper< VImageDimension, VLoop >

Fast Index/Offset computation.

These helper methods use recursive templates to unroll the loops of simple calculations. The resulting speed improvement varies from compiler to compiler. Some gcc compilers with debug turned on exhibit slight speed increases, but most compilers see improvement. The ComputeOffset performance improvement is impressive. For example, the Windows VS7.0 compiler shows almost a factor of 2 speed improvement with the recursive templates. Usually recursive templates use partial specialization to terminate loops. Here we use a technique used by Brad King in the itk Concept Checking code.

Note

This work is part of the National Alliance for Medical Image Computing (NAMIC), funded by the National Institutes of Health through the NIH Roadmap for Medical Research, Grant U54 EB005149. Information on the National Centers for Biomedical Computing can be obtained from http://commonfund.nih.gov/bioinformatics.

Definition at line 53 of file itkImageHelper.h.

Public Types
using	ImageType = ImageBase< VImageDimension >
using	IndexType = typename ImageType::IndexType
using	IndexValueType = typename ImageType::IndexValueType
using	OffsetType = typename ImageType::OffsetType
using	OffsetValueType = typename ImageType::OffsetValueType

Static Public Member Functions
static void	ComputeIndex (const IndexType &bufferedRegionIndex, OffsetValueType offset, [[maybe_unused]] const OffsetValueType offsetTable[], IndexType &index)
static void	ComputeOffset (const IndexType &bufferedRegionIndex, const IndexType &index, [[maybe_unused]] const OffsetValueType offsetTable[], OffsetValueType &offset)

Member Typedef Documentation

ImageType

template<unsigned int VImageDimension, unsigned int VLoop>

using itk::ImageHelper< VImageDimension, VLoop >::ImageType = ImageBase<VImageDimension>

Definition at line 56 of file itkImageHelper.h.

IndexType

template<unsigned int VImageDimension, unsigned int VLoop>

using itk::ImageHelper< VImageDimension, VLoop >::IndexType = typename ImageType::IndexType

Definition at line 57 of file itkImageHelper.h.

IndexValueType

template<unsigned int VImageDimension, unsigned int VLoop>

using itk::ImageHelper< VImageDimension, VLoop >::IndexValueType = typename ImageType::IndexValueType

Definition at line 60 of file itkImageHelper.h.

OffsetType

template<unsigned int VImageDimension, unsigned int VLoop>

using itk::ImageHelper< VImageDimension, VLoop >::OffsetType = typename ImageType::OffsetType

Definition at line 58 of file itkImageHelper.h.

OffsetValueType

template<unsigned int VImageDimension, unsigned int VLoop>

using itk::ImageHelper< VImageDimension, VLoop >::OffsetValueType = typename ImageType::OffsetValueType

Definition at line 59 of file itkImageHelper.h.

Member Function Documentation

ComputeIndex()

template<unsigned int VImageDimension, unsigned int VLoop>

static void itk::ImageHelper< VImageDimension, VLoop >::ComputeIndex ( const IndexType &  bufferedRegionIndex, OffsetValueType  offset, [[maybe_unused] ] const OffsetValueType  offsetTable[], IndexType &  index  )

inlinestatic

ComputeIndex with recursive templates

Definition at line 64 of file itkImageHelper.h.

Referenced by itk::ImageBase< TImage::ImageDimension >::ComputeIndex(), and itk::ImageBase< TImage::ImageDimension >::FastComputeIndex().

ComputeOffset()

template<unsigned int VImageDimension, unsigned int VLoop>

static void itk::ImageHelper< VImageDimension, VLoop >::ComputeOffset ( const IndexType &  bufferedRegionIndex, const IndexType &  index, [[maybe_unused] ] const OffsetValueType  offsetTable[], OffsetValueType &  offset  )

inlinestatic

Definition at line 92 of file itkImageHelper.h.

Referenced by itk::ImageRegionRange< TImage >::ComputeOffset(), itk::ImageBase< TImage::ImageDimension >::ComputeOffset(), and itk::ImageBase< TImage::ImageDimension >::FastComputeOffset().

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

• itkImageHelper.h