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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkImageRandomConstIteratorWithIndex.txx.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:39 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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#ifndef _itkImageRandomConstIteratorWithIndex_txx |
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#define _itkImageRandomConstIteratorWithIndex_txx |
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#include "itkImageRandomConstIteratorWithIndex.h" |
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namespace itk |
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{ |
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/** Default constructor. Needed since we provide a cast constructor. */ |
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template<class TImage> |
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ImageRandomConstIteratorWithIndex<TImage> |
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::ImageRandomConstIteratorWithIndex() : ImageConstIteratorWithIndex<TImage>() |
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{ |
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m_NumberOfPixelsInRegion = 0L; |
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m_NumberOfSamplesRequested = 0L; |
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m_NumberOfSamplesDone = 0L; |
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m_Generator = Statistics::MersenneTwisterRandomVariateGenerator::New(); |
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} |
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/** Constructor establishes an iterator to walk a particular image and a |
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* particular region of that image. */ |
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template<class TImage> |
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ImageRandomConstIteratorWithIndex<TImage> |
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::ImageRandomConstIteratorWithIndex(const ImageType *ptr, const RegionType& region) |
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**: ImageConstIteratorWithIndex<TImage>( ptr, region ) |
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{ |
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m_NumberOfPixelsInRegion = region.GetNumberOfPixels(); |
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m_NumberOfSamplesRequested = 0L; |
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m_NumberOfSamplesDone = 0L; |
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m_Generator = Statistics::MersenneTwisterRandomVariateGenerator::New(); |
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} |
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/** Set the number of samples to extract from the region */ |
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template<class TImage> |
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void |
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ImageRandomConstIteratorWithIndex<TImage> |
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::SetNumberOfSamples( unsigned long number ) |
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{ |
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m_NumberOfSamplesRequested = number; |
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} |
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/** Set the number of samples to extract from the region */ |
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template<class TImage> |
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unsigned long |
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ImageRandomConstIteratorWithIndex<TImage> |
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::GetNumberOfSamples( void ) const |
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{ |
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return m_NumberOfSamplesRequested; |
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} |
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/** Reinitialize the seed of the random number generator */ |
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template<class TImage> |
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void |
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ImageRandomConstIteratorWithIndex<TImage> |
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::ReinitializeSeed() |
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{ |
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m_Generator->SetSeed(); |
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} |
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template<class TImage> |
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void |
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ImageRandomConstIteratorWithIndex<TImage> |
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::ReinitializeSeed(int seed) |
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{ |
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m_Generator->SetSeed ( seed ); |
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// vnl_sample_reseed(seed); |
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} |
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/** Execute an acrobatic random jump */ |
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template<class TImage> |
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void |
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ImageRandomConstIteratorWithIndex<TImage> |
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::RandomJump() |
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{ |
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const unsigned long randomPosition = |
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****static_cast<unsigned long > ( m_Generator->GetVariateWithOpenRange ( static_cast<double>(m_NumberOfPixelsInRegion)-0.5 ) ); |
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/* |
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******vnl_sample_uniform(0.0f, |
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static_cast<double>(m_NumberOfPixelsInRegion)-0.5) ); |
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*/ |
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unsigned long position = randomPosition; |
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unsigned long residual; |
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for( unsigned int dim = 0; dim < TImage::ImageDimension; dim++ ) |
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{ |
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const unsigned long sizeInThisDimension = this->m_Region.GetSize()[dim]; |
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residual = position % sizeInThisDimension; |
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this->m_PositionIndex[dim] = residual + this->m_BeginIndex[dim]; |
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position -= residual; |
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position /= sizeInThisDimension; |
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} |
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this->m_Position = this->m_Image->GetBufferPointer() + this->m_Image->ComputeOffset( this->m_PositionIndex ); |
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} |
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} // end namespace itk |
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#endif |
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