/usr/include/InsightToolkit/Common/itkImageRandomConstIteratorWithIndex.txx is in libinsighttoolkit3-dev 3.20.1-1.
This file is owned by root:root, with mode 0o644.
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Program: Insight Segmentation & Registration Toolkit
Module: itkImageRandomConstIteratorWithIndex.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 __itkImageRandomConstIteratorWithIndex_txx
#define __itkImageRandomConstIteratorWithIndex_txx
#include "itkImageRandomConstIteratorWithIndex.h"
namespace itk
{
/** Default constructor. Needed since we provide a cast constructor. */
template<class TImage>
ImageRandomConstIteratorWithIndex<TImage>
::ImageRandomConstIteratorWithIndex() : ImageConstIteratorWithIndex<TImage>()
{
m_NumberOfPixelsInRegion = 0L;
m_NumberOfSamplesRequested = 0L;
m_NumberOfSamplesDone = 0L;
m_Generator = Statistics::MersenneTwisterRandomVariateGenerator::New();
}
/** Constructor establishes an iterator to walk a particular image and a
* particular region of that image. */
template<class TImage>
ImageRandomConstIteratorWithIndex<TImage>
::ImageRandomConstIteratorWithIndex(const ImageType *ptr, const RegionType& region)
: ImageConstIteratorWithIndex<TImage>( ptr, region )
{
m_NumberOfPixelsInRegion = region.GetNumberOfPixels();
m_NumberOfSamplesRequested = 0L;
m_NumberOfSamplesDone = 0L;
m_Generator = Statistics::MersenneTwisterRandomVariateGenerator::New();
}
/** Set the number of samples to extract from the region */
template<class TImage>
void
ImageRandomConstIteratorWithIndex<TImage>
::SetNumberOfSamples( unsigned long number )
{
m_NumberOfSamplesRequested = number;
}
/** Set the number of samples to extract from the region */
template<class TImage>
unsigned long
ImageRandomConstIteratorWithIndex<TImage>
::GetNumberOfSamples( void ) const
{
return m_NumberOfSamplesRequested;
}
/** Reinitialize the seed of the random number generator */
template<class TImage>
void
ImageRandomConstIteratorWithIndex<TImage>
::ReinitializeSeed()
{
m_Generator->SetSeed();
}
template<class TImage>
void
ImageRandomConstIteratorWithIndex<TImage>
::ReinitializeSeed(int seed)
{
m_Generator->SetSeed ( seed );
// vnl_sample_reseed(seed);
}
/** Execute an acrobatic random jump */
template<class TImage>
void
ImageRandomConstIteratorWithIndex<TImage>
::RandomJump()
{
const unsigned long randomPosition =
static_cast<unsigned long > ( m_Generator->GetVariateWithOpenRange ( static_cast<double>(m_NumberOfPixelsInRegion)-0.5 ) );
/*
vnl_sample_uniform(0.0f,
static_cast<double>(m_NumberOfPixelsInRegion)-0.5) );
*/
unsigned long position = randomPosition;
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
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