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itkImageRandomNonRepeatingConstIteratorWithIndex.txx
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itkImageRandomNonRepeatingConstIteratorWithIndex.txx
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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkImageRandomNonRepeatingConstIteratorWithIndex.txx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef __itkImageRandomNonRepeatingConstIteratorWithIndex_txx
#define __itkImageRandomNonRepeatingConstIteratorWithIndex_txx
#include "itkImageRandomNonRepeatingConstIteratorWithIndex.h"
namespace itk
{
/** Default constructor. Needed since we provide a cast constructor. */
template<class TImage>
ImageRandomNonRepeatingConstIteratorWithIndex<TImage>
::ImageRandomNonRepeatingConstIteratorWithIndex() : ImageConstIteratorWithIndex<TImage>()
{
m_NumberOfPixelsInRegion = 0L;
m_NumberOfSamplesRequested = 0L;
m_NumberOfSamplesDone = 0L;
m_Permutation=NULL;
}
/** Constructor establishes an iterator to walk a particular image and a
* particular region of that image. */
template<class TImage>
ImageRandomNonRepeatingConstIteratorWithIndex<TImage>
::ImageRandomNonRepeatingConstIteratorWithIndex(const ImageType *ptr, const RegionType& region)
: ImageConstIteratorWithIndex<TImage>( ptr, region )
{
m_NumberOfPixelsInRegion = region.GetNumberOfPixels();
m_NumberOfSamplesRequested = 0L;
m_NumberOfSamplesDone = 0L;
m_Permutation=new RandomPermutation(m_NumberOfPixelsInRegion);
}
/** Set the number of samples to extract from the region */
template<class TImage>
void
ImageRandomNonRepeatingConstIteratorWithIndex<TImage>
::SetNumberOfSamples( unsigned long number )
{
m_NumberOfSamplesRequested = number;
if(number>m_NumberOfPixelsInRegion) m_NumberOfSamplesRequested=m_NumberOfPixelsInRegion;
}
/** Set the number of samples to extract from the region */
template<class TImage>
unsigned long
ImageRandomNonRepeatingConstIteratorWithIndex<TImage>
::GetNumberOfSamples( void ) const
{
return m_NumberOfSamplesRequested;
}
/** Reinitialize the seed of the random number generator */
template<class TImage>
void
ImageRandomNonRepeatingConstIteratorWithIndex<TImage>
::ReinitializeSeed()
{
this->m_Permutation->ReinitializeSeed();
this->m_Permutation->Shuffle();
}
template<class TImage>
void
ImageRandomNonRepeatingConstIteratorWithIndex<TImage>
::ReinitializeSeed(int seed)
{
this->m_Permutation->ReinitializeSeed(seed);
this->m_Permutation->Shuffle();
}
/** update the position */
template<class TImage>
void
ImageRandomNonRepeatingConstIteratorWithIndex<TImage>
::SetPriorityImage(const PriorityImageType* priorityImage)
{
// should probably do error checking to be sure that the priority
// image is the right size
IndexType positionIndex;
unsigned long position,pixel;
unsigned long residual;
for(pixel=0;pixel<m_NumberOfPixelsInRegion;pixel++)
{
position=pixel;
for( unsigned int dim = 0; dim < TImage::ImageDimension; dim++ )
{
const unsigned long sizeInThisDimension = this->m_Region.GetSize()[dim];
residual = position % sizeInThisDimension;
positionIndex[dim] = residual + this->m_BeginIndex[dim];
position -= residual;
position /= sizeInThisDimension;
}
//std::cout<<pixel<<" "<<positionIndex<<" "<<priorityImage->GetPixel(positionIndex)std::endl;
this->m_Permutation->SetPriority(pixel,priorityImage->GetPixel(positionIndex));
}
this->m_Permutation->Shuffle();
}
/** update the position */
template<class TImage>
void
ImageRandomNonRepeatingConstIteratorWithIndex<TImage>
::UpdatePosition()
{
unsigned long position = (*(this->m_Permutation))[m_NumberOfSamplesDone%m_NumberOfSamplesRequested];
unsigned long residual;
for( unsigned int dim = 0; dim < TImage::ImageDimension; dim++ )
{
const unsigned long sizeInThisDimension = this->m_Region.GetSize()[dim];
residual = position % sizeInThisDimension;
this->m_PositionIndex[dim] = residual + this->m_BeginIndex[dim];
position -= residual;
position /= sizeInThisDimension;
}
this->m_Position = this->m_Image->GetBufferPointer() + this->m_Image->ComputeOffset( this->m_PositionIndex );
}
} // end namespace itk
#endif