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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkImageRandomConstIteratorWithIndex.h.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_h |
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#define __itkImageRandomConstIteratorWithIndex_h |
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#include "itkImageConstIteratorWithIndex.h" |
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#include "itkMersenneTwisterRandomVariateGenerator.h" |
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namespace itk |
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{ |
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/** \class ImageRandomConstIteratorWithIndex |
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* \brief A multi-dimensional image iterator that visits a random set of pixels |
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* within an image region. |
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* |
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* ImageRandomConstIteratorWithIndex is a multi-dimensional iterator class that |
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* is templated over image type. ImageRandomConstIteratorWithIndex is |
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* constrained to walk only within the specified region. It samples random |
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* pixel positions at each increment or decrement. |
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* |
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* ImageRandomConstIteratorWithIndex assumes a particular layout of the image data. The |
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* is arranged in a 1D array as if it were [][][][slice][row][col] with |
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* Index[0] = col, Index[1] = row, Index[2] = slice, etc. |
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* |
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* The operator++ method provides a simple syntax for walking around a region |
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* of a multidimensional image. operator++ performs a jump to a random position |
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* within the specified image region. This is designed to facilitate the |
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* extraction of random samples from the image. |
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* |
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* This is the typical use of this iterator in a loop: |
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* |
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* \code |
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* |
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* ImageRandomConstIteratorWithIndex<ImageType> it( image, image->GetRequestedRegion() ); |
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* |
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* it.SetNumberOfSamples(200); |
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* it.GoToBegin(); |
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* while( !it.IsAtEnd() ) |
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* { |
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** it.Get(); |
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** ++it; // here it jumps to another random position inside the region |
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** } |
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* |
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* \endcode |
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* |
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* or |
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* |
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* \code |
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* |
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* ImageRandomConstIteratorWithIndex<ImageType> it( image, image->GetRequestedRegion() ); |
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* |
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* it.SetNumberOfSamples(200); |
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* it.GoToEnd(); |
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* while( !it.IsAtBegin() ) |
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* { |
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** it.Get(); |
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** --it; // here it jumps to another random position inside the region |
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** } |
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* |
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* \endcode |
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* |
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* \warning Incrementing the iterator (++it) followed by a decrement (--it) |
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* or vice versa does not in general return the iterator to the same position. |
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* |
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* \example Examples/itkImageRandomConstIteratorWithIndex.cxx |
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* |
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* \par MORE INFORMATION |
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* For a complete description of the ITK Image Iterators and their API, please |
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* see the Iterators chapter in the ITK Software Guide. The ITK Software Guide |
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* is available in print and as a free .pdf download from http://www.itk.org. |
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* |
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* \ingroup ImageIterators |
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* |
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* \sa ImageConstIterator \sa ConditionalConstIterator |
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* \sa ConstNeighborhoodIterator \sa ConstShapedNeighborhoodIterator |
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* \sa ConstSliceIterator \sa CorrespondenceDataStructureIterator |
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* \sa FloodFilledFunctionConditionalConstIterator |
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* \sa FloodFilledImageFunctionConditionalConstIterator |
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* \sa FloodFilledImageFunctionConditionalIterator |
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* \sa FloodFilledSpatialFunctionConditionalConstIterator |
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* \sa FloodFilledSpatialFunctionConditionalIterator |
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* \sa ImageConstIterator \sa ImageConstIteratorWithIndex |
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* \sa ImageIterator \sa ImageIteratorWithIndex |
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* \sa ImageLinearConstIteratorWithIndex \sa ImageLinearIteratorWithIndex |
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* \sa ImageRandomConstIteratorWithIndex \sa ImageRandomIteratorWithIndex |
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* \sa ImageRegionConstIterator \sa ImageRegionConstIteratorWithIndex |
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* \sa ImageRegionExclusionConstIteratorWithIndex |
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* \sa ImageRegionExclusionIteratorWithIndex |
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* \sa ImageRegionIterator \sa ImageRegionIteratorWithIndex |
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* \sa ImageRegionReverseConstIterator \sa ImageRegionReverseIterator |
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* \sa ImageReverseConstIterator \sa ImageReverseIterator |
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* \sa ImageSliceConstIteratorWithIndex \sa ImageSliceIteratorWithIndex |
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* \sa NeighborhoodIterator \sa PathConstIterator \sa PathIterator |
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* \sa ShapedNeighborhoodIterator \sa SliceIterator |
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* \sa ImageConstIteratorWithIndex |
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* |
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*/ |
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template<typename TImage> |
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class ITK_EXPORT ImageRandomConstIteratorWithIndex : public ImageConstIteratorWithIndex<TImage> |
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{ |
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public: |
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/** Standard class typedefs. */ |
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typedef ImageRandomConstIteratorWithIndex Self; |
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TDA |
typedef ImageConstIteratorWithIndex<TImage> Superclass; |
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/** Index typedef support. While this was already typdef'ed in the superclass |
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* it needs to be redone here for this subclass to compile properly with gcc. |
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* Note that we have to rescope Index back to itk::Index to that is it not |
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* confused with ImageIterator::Index. */ |
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typedef typename TImage::IndexType IndexType; |
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/** Region typedef support. While this was already typdef'ed in the superclass |
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* it needs to be redone here for this subclass to compile properly with gcc. |
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* Note that we have to rescope Region back to itk::ImageRegion so that is |
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* it not confused with ImageIterator::Index. */ |
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typedef typename TImage::RegionType RegionType; |
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/** Image typedef support. While this was already typdef'ed in the superclass |
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* it needs to be redone here for this subclass to compile properly with gcc. |
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* Note that we have to rescope Index back to itk::Index to that is it not |
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* confused with ImageIterator::Index. */ |
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typedef TImage ImageType; |
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/** PixelContainer typedef support. Used to refer to the container for |
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* the pixel data. While this was already typdef'ed in the superclass |
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* it needs to be redone here for this subclass to compile properly with gcc. */ |
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typedef typename TImage::PixelContainer PixelContainer; |
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TDA |
typedef typename PixelContainer::Pointer PixelContainerPointer; |
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/** Default constructor. Needed since we provide a cast constructor. */ |
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ImageRandomConstIteratorWithIndex(); |
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~ImageRandomConstIteratorWithIndex() {}; |
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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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ImageRandomConstIteratorWithIndex(const ImageType *ptr, const RegionType& region); |
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/** Constructor that can be used to cast from an ImageIterator to an |
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* ImageRandomConstIteratorWithIndex. Many routines return an ImageIterator but for a |
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* particular task, you may want an ImageRandomConstIteratorWithIndex. Rather than |
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* provide overloaded APIs that return different types of Iterators, itk |
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* returns ImageIterators and uses constructors to cast from an |
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* ImageIterator to a ImageRandomConstIteratorWithIndex. */ |
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ImageRandomConstIteratorWithIndex( const ImageConstIteratorWithIndex<TImage> &it) |
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{ this->ImageConstIteratorWithIndex<TImage>::operator=(it); } |
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/** Move an iterator to the beginning of the region. */ |
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void GoToBegin(void) |
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**{ |
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this->RandomJump(); |
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m_NumberOfSamplesDone = 0L; |
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**} |
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/** Move an iterator to one position past the End of the region. */ |
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void GoToEnd(void) |
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**{ |
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this->RandomJump(); |
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m_NumberOfSamplesDone = m_NumberOfSamplesRequested; |
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**} |
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/** Is the iterator at the beginning of the region? */ |
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bool IsAtBegin(void) const |
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{ return (m_NumberOfSamplesDone == 0L) ; } |
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/** Is the iterator at the end of the region? */ |
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bool IsAtEnd(void) const |
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{ return (m_NumberOfSamplesDone >= m_NumberOfSamplesRequested); } |
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/** Increment (prefix) the selected dimension. |
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* No bounds checking is performed. \sa GetIndex \sa operator-- */ |
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Self & operator++() |
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**{ |
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this->RandomJump(); |
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m_NumberOfSamplesDone++; |
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return *this; |
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**} |
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/** Decrement (prefix) the selected dimension. |
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* No bounds checking is performed. \sa GetIndex \sa operator++ */ |
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Self & operator--() |
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**{ |
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this->RandomJump(); |
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m_NumberOfSamplesDone--; |
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return *this; |
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**} |
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/** Set/Get number of random samples to get from the image region */ |
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void SetNumberOfSamples( unsigned long number ); |
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unsigned long GetNumberOfSamples( void ) const; |
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/** Reinitialize the seed of the random number generator */ |
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void ReinitializeSeed(); |
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void ReinitializeSeed(int); |
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private: |
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void RandomJump(); |
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Statistics::MersenneTwisterRandomVariateGenerator::Pointer m_Generator; |
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unsigned long m_NumberOfSamplesRequested; |
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unsigned long m_NumberOfSamplesDone; |
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unsigned long m_NumberOfPixelsInRegion; |
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}; |
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} // end namespace itk |
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#ifndef ITK_MANUAL_INSTANTIATION |
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#include "itkImageRandomConstIteratorWithIndex.txx" |
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#endif |
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#endif |
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EOF |
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EOF,EML |
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EOF,EML |
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