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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkNoiseImageFilter.h,v $
Language: C++
Date: $Date: 2006-03-30 15:36:24 $
Version: $Revision: 1.3 $
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 __itkNoiseImageFilter_h
#define __itkNoiseImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkImage.h"
#include "itkNumericTraits.h"
namespace itk
{
/** \class NoiseImageFilter
* \brief Calculate the local noise in an image.
*
* Computes an image where a given pixel is the standard deviation of
* the pixels in a neighborhood about the corresponding input pixel.
* This serves as an estimate of the local noise (or texture) in an
* image. Currently, this noise estimate assume a piecewise constant
* image. This filter should be extended to fitting a (hyper) plane
* to the neighborhood and calculating the standard deviation of the
* residuals to this (hyper) plane.
*
* \sa Image
* \sa Neighborhood
* \sa NeighborhoodOperator
* \sa NeighborhoodIterator
*
* \ingroup IntensityImageFilters
*/
template <class TInputImage, class TOutputImage>
class ITK_EXPORT NoiseImageFilter :
public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
/** Extract dimension from input and output image. */
itkStaticConstMacro(InputImageDimension, unsigned int,
TInputImage::ImageDimension);
itkStaticConstMacro(OutputImageDimension, unsigned int,
TOutputImage::ImageDimension);
/** Convenient typedefs for simplifying declarations. */
typedef TInputImage InputImageType;
typedef TOutputImage OutputImageType;
/** Standard class typedefs. */
typedef NoiseImageFilter Self;
typedef ImageToImageFilter< InputImageType, OutputImageType> 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(NoiseImageFilter, ImageToImageFilter);
/** Image typedef support. */
typedef typename InputImageType::PixelType InputPixelType;
typedef typename OutputImageType::PixelType OutputPixelType;
typedef typename NumericTraits<InputPixelType>::RealType InputRealType;
typedef typename InputImageType::RegionType InputImageRegionType;
typedef typename OutputImageType::RegionType OutputImageRegionType;
typedef typename InputImageType::SizeType InputSizeType;
/** Set the radius of the neighborhood used to compute the noise.
* In general, the radius should be small. But if set to one, the
* confidence in the estimates will be marginal. */
itkSetMacro(Radius, InputSizeType);
/** Get the radius of the neighborhood used to compute the noise */
itkGetConstReferenceMacro(Radius, InputSizeType);
/** NoiseImageFilter needs a larger input requested region than
* the output requested region. As such, NoiseImageFilter needs
* to provide an implementation for GenerateInputRequestedRegion()
* in order to inform the pipeline execution model.
*
* \sa ImageToImageFilter::GenerateInputRequestedRegion() */
virtual void GenerateInputRequestedRegion() throw(InvalidRequestedRegionError);
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(InputHasNumericTraitsCheck,
(Concept::HasNumericTraits<InputPixelType>));
/** End concept checking */
#endif
protected:
NoiseImageFilter();
virtual ~NoiseImageFilter() {}
void PrintSelf(std::ostream& os, Indent indent) const;
/** NoiseImageFilter 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& outputRegionForThread,
int threadId );
private:
NoiseImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
InputSizeType m_Radius;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkNoiseImageFilter.txx"
#endif
#endif
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