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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkDifferenceImageFilter.h,v $
Language: C++
Date: $Date: 2007-02-08 18:55:54 $
Version: $Revision: 1.11 $
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 __itkDifferenceImageFilter_h
#define __itkDifferenceImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkNumericTraits.h"
#include "itkArray.h"
namespace itk
{
/** \class DifferenceImageFilter
* \brief Implements comparison between two images.
*
* This filter is used by the testing system to compute the difference between
* a valid image and an image produced by the test. The comparison value is
* computed by visiting all the pixels in the baseline images and comparing
* their values with the pixel values in the neighborhood of the homologous
* pixel in the other image.
*
* \ingroup IntensityImageFilters Multithreaded
*/
template <class TInputImage, class TOutputImage>
class ITK_EXPORT DifferenceImageFilter :
public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
/** Standard class typedefs. */
typedef DifferenceImageFilter Self;
typedef ImageToImageFilter<TInputImage,TOutputImage> Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(DifferenceImageFilter, ImageToImageFilter);
/** Some convenient typedefs. */
typedef TInputImage InputImageType;
typedef TOutputImage OutputImageType;
typedef typename OutputImageType::PixelType OutputPixelType;
typedef typename OutputImageType::RegionType OutputImageRegionType;
typedef typename NumericTraits<OutputPixelType>::RealType RealType;
typedef typename NumericTraits<RealType>::AccumulateType AccumulateType;
/** Set the valid image input. This will be input 0. */
virtual void SetValidInput(const InputImageType* validImage);
/** Set the test image input. This will be input 1. */
virtual void SetTestInput(const InputImageType* testImage);
/** Set/Get the maximum distance away to look for a matching pixel.
Default is 0. */
itkSetMacro(ToleranceRadius, int);
itkGetMacro(ToleranceRadius, int);
/** Set/Get the minimum threshold for pixels to be different.
Default is 0. */
itkSetMacro(DifferenceThreshold, OutputPixelType);
itkGetMacro(DifferenceThreshold, OutputPixelType);
/** Get parameters of the difference image after execution. */
itkGetMacro(MeanDifference, RealType);
itkGetMacro(TotalDifference, AccumulateType);
itkGetMacro(NumberOfPixelsWithDifferences, unsigned long);
protected:
DifferenceImageFilter();
virtual ~DifferenceImageFilter() {}
void PrintSelf(std::ostream& os, Indent indent) const;
/** DifferenceImageFilter can be implemented as a multithreaded
* filter. Therefore, this implementation provides a
* ThreadedGenerateData() routine which is called for each
* processing thread. The output image data is allocated
* automatically by the superclass prior to calling
* ThreadedGenerateData(). ThreadedGenerateData can only write to
* the portion of the output image specified by the parameter
* "outputRegionForThread"
*
* \sa ImageToImageFilter::ThreadedGenerateData(),
* ImageToImageFilter::GenerateData() */
void ThreadedGenerateData(const OutputImageRegionType& threadRegion,
int threadId);
void BeforeThreadedGenerateData();
void AfterThreadedGenerateData();
OutputPixelType m_DifferenceThreshold;
RealType m_MeanDifference;
AccumulateType m_TotalDifference;
unsigned long m_NumberOfPixelsWithDifferences;
int m_ToleranceRadius;
Array<AccumulateType> m_ThreadDifferenceSum;
Array<unsigned long> m_ThreadNumberOfPixels;
private:
DifferenceImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
};
} // end namespace itk
// Define instantiation macro for this template.
#define ITK_TEMPLATE_DifferenceImageFilter(_, EXPORT, x, y) namespace itk { \
_(2(class EXPORT DifferenceImageFilter< ITK_TEMPLATE_2 x >)) \
namespace Templates { typedef DifferenceImageFilter< ITK_TEMPLATE_2 x > \
DifferenceImageFilter##y; } \
}
#if ITK_TEMPLATE_EXPLICIT
# include "Templates/itkDifferenceImageFilter+-.h"
#endif
#if ITK_TEMPLATE_TXX
# include "itkDifferenceImageFilter.txx"
#endif
#endif
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