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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkMovingHistogramImageFilter.h
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 __itkMovingHistogramImageFilter_h
#define __itkMovingHistogramImageFilter_h
#include "itkMovingHistogramImageFilterBase.h"
//#define zigzag
namespace itk {
/**
* \class MovingHistogramImageFilter
* \brief Implements a generic moving histogram algorithm
*
* This filter is a base class to implement efficiently many neighborhood
* filters. Instead of visiting all the neighbors of a pixel, the set
* of pixels in the neighborhood is updated when the filter is moving
* to a new pixel. The number of pixels read for each pixel can be very
* smaller than the number of pixels read by a basic algorithm.
*
* This filter moves the neighborhood over all the pixels of the output requested region,
* and pass the pixel added and removed of the neighborhood to the an
* histogram class. This filter doesn't implement the histogram class - it
* must be implement and passed as template parameter. The histogram class
* is not necessary a real histogram. It can be implemented in many ways,
* and only has to provide the methods described below.
*
* This filter takes 4 template parameters: the input and output image type,
* the structuring element (or kernel) type, and the histogram type.
* The input and output image must have the same number of dimension.
*
* The histogram type is a class which has to implements seven methods:
* + a default constructor which takes no parameter.
* + HistogramType * Clone() must produce a new identical histogram. It is
* used internally to optimize the filter, by avoiding reverse iteration
* over the image.
* + void AddPixel( const InputPixelType &p ) is called when a new pixel
* is added to the histogram.
* + void RemovePixel( const InputPixelType &p ) is called when a pixel
* is removed of the histogram.
* + void AddBoundary() is called when a pixel outside the image is added.
* No value is provided: it's the responsability to the histogram class to
* get it if needed. This method can be kept empty to ignore the boundary
* pixels.
* + void RemoveBoundary() is called to when a pixel outside the image is removed.
* No value is provided: it's the responsability to the histogram class to
* get it if needed. This method can be kept empty to ignore the boundary
* pixels.
* + AType GetValue() is called to set the value of the output image. AType
* must be the output pixel type, or a type castable to the output pixel type.
*
* MovingHistogramImageFilter add the new pixels before removing the old ones,
* so, if AddBoundary() is implemented and/or the kernel is symetric, it is safe
* to consider that the histogram will never be empty.
*
* One histogram is created for each thread by the method NewHistogram().
* The NewHistogram() method can be overiden to pass some parameters to the
* histogram.
*
* The neighborhood is defined by a structuring element, and must a
* itk::Neighborhood object or a subclass.
* The structuring element is assumed to be composed of binary
* values (zero or one). Only elements of the structuring element
* having values > 0 are candidates for affecting the center pixel.
*
* \sa MovingWindowMeanImageFilter, RankImageFilter, MaskedMovingHistogramImageFitler,
* \sa MovingHistogramMorphologicalGradientImageFilter
* \ingroup ImageEnhancement MathematicalMorphologyImageFilters
*
* \author Gaetan Lehmann
* \author Richard Beare
*/
template<class TInputImage, class TOutputImage, class TKernel, class THistogram >
class ITK_EXPORT MovingHistogramImageFilter :
public MovingHistogramImageFilterBase<TInputImage, TOutputImage, TKernel>
{
public:
/** Standard class typedefs. */
typedef MovingHistogramImageFilter Self;
typedef MovingHistogramImageFilterBase<TInputImage, TOutputImage, TKernel> Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Standard New method. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(MovingHistogramImageFilter,
MovingHistogramImageFilter);
/** Image related typedefs. */
typedef TInputImage InputImageType;
typedef TOutputImage OutputImageType;
typedef typename TInputImage::RegionType RegionType;
typedef typename TInputImage::SizeType SizeType;
typedef typename TInputImage::IndexType IndexType;
typedef typename TInputImage::PixelType PixelType;
typedef typename TInputImage::OffsetType OffsetType;
typedef typename Superclass::OutputImageRegionType OutputImageRegionType;
typedef typename TOutputImage::PixelType OutputPixelType;
/** Image related typedefs. */
itkStaticConstMacro(ImageDimension, unsigned int,
TInputImage::ImageDimension);
/** Kernel typedef. */
typedef TKernel KernelType;
/** Kernel (structuring element) iterator. */
typedef typename KernelType::ConstIterator KernelIteratorType;
/** n-dimensional Kernel radius. */
typedef typename KernelType::SizeType RadiusType;
typedef typename std::list< OffsetType > OffsetListType;
typedef typename std::map< OffsetType, OffsetListType, typename OffsetType::LexicographicCompare > OffsetMapType;
protected:
MovingHistogramImageFilter();
~MovingHistogramImageFilter() {};
/** Multi-thread version GenerateData. */
void ThreadedGenerateData (const OutputImageRegionType&
outputRegionForThread,
int threadId);
/** NewHistogram must return an histogram object. It's also the good place to
* pass parameters to the histogram.
* A default version is provided which just create a new Historgram and return
* it.
*/
virtual THistogram * NewHistogram();
#ifndef zigzag
// declare the type used to store the histogram
typedef THistogram HistogramType;
void PushHistogram(HistogramType * histogram,
const OffsetListType* addedList,
const OffsetListType* removedList,
const RegionType &inputRegion,
const RegionType &kernRegion,
const InputImageType* inputImage,
const IndexType currentIdx);
void PrintHistogram(const HistogramType &H);
#endif
private:
MovingHistogramImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
}; // end of class
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkMovingHistogramImageFilter.txx"
#endif
#endif
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