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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkLaplacianImageFilter.h,v $
Language: C++
Date: $Date: 2007-09-19 17:24:12 $
Version: $Revision: 1.13 $
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 __itkLaplacianImageFilter_h
#define __itkLaplacianImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkImage.h"
namespace itk
{
/**
* \class LaplacianImageFilter
*
* This filter computes the Laplacian of a scalar-valued image. The Laplacian
* is an isotropic measure of the 2nd spatial derivative of an image. The
* Laplacian of an image highlights regions of rapid intensity change and is
* therefore often used for edge detection. Often, the Laplacian is applied to
* an image that has first been smoothed with a Gaussian filter in order to
* reduce its sensitivity to noise.
*
*
*
* \par
* The Laplacian at each pixel location is computed by convolution with the
* itk::LaplacianOperator.
*
* \par Inputs and Outputs
* The input to this filter is a scalar-valued itk::Image of arbitrary
* dimension. The output is a scalar-valued itk::Image.
*
* \warning The pixel type of the input and output images must be of real type
* (float or double). ConceptChecking is used here to enforce the input pixel
* type. You will get a compilation error if the pixel type of the input and
* output images is not float or double.
*
*
* \sa Image
* \sa Neighborhood
* \sa NeighborhoodOperator
* \sa NeighborhoodIterator
* \sa LaplacianOperator
*
* \ingroup ImageFeatureExtraction */
template <class TInputImage, class TOutputImage>
class ITK_EXPORT LaplacianImageFilter :
public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
/** Standard "Self" & Superclass typedef. */
typedef LaplacianImageFilter Self;
typedef ImageToImageFilter< TInputImage, TOutputImage > Superclass;
/** Extract some information from the image types. Dimensionality
* of the two images is assumed to be the same. */
typedef typename TOutputImage::PixelType OutputPixelType;
typedef typename TOutputImage::InternalPixelType OutputInternalPixelType;
typedef typename TInputImage::PixelType InputPixelType;
typedef typename TInputImage::InternalPixelType InputInternalPixelType;
itkStaticConstMacro(InputImageDimension, unsigned int,
TInputImage::ImageDimension);
itkStaticConstMacro(ImageDimension, unsigned int,
TOutputImage::ImageDimension);
/** Image typedef support. */
typedef TInputImage InputImageType;
typedef TOutputImage OutputImageType;
typedef typename InputImageType::Pointer InputImagePointer;
/** Smart pointer typedef support. */
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Run-time type information (and related methods) */
itkTypeMacro(LaplacianImageFilter, ImageToImageFilter);
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** LaplacianImageFilter needs a larger input requested region than
* the output requested region (larger in the direction of the
* derivative). As such, LaplacianImageFilter needs to provide an
* implementation for GenerateInputRequestedRegion() in order to
* inform the pipeline execution model.
*
* \sa ImageToImageFilter::GenerateInputRequestedRegion() */
virtual void GenerateInputRequestedRegion() throw(InvalidRequestedRegionError);
/** Use the image spacing information in calculations. Use this option if you
* want derivatives in physical space. Default is UseImageSpacingOn. */
void SetUseImageSpacingOn()
{ this->SetUseImageSpacing(true); }
/** Ignore the image spacing. Use this option if you want derivatives in
isotropic pixel space. Default is UseImageSpacingOn. */
void SetUseImageSpacingOff()
{ this->SetUseImageSpacing(false); }
/** Set/Get whether or not the filter will use the spacing of the input
image in its calculations */
itkSetMacro(UseImageSpacing, bool);
itkGetMacro(UseImageSpacing, bool);
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(SameDimensionCheck,
(Concept::SameDimension<InputImageDimension, ImageDimension>));
itkConceptMacro(InputPixelTypeIsFloatingPointCheck,
(Concept::IsFloatingPoint<InputPixelType>));
itkConceptMacro(OutputPixelTypeIsFloatingPointCheck,
(Concept::IsFloatingPoint<OutputPixelType>));
/** End concept checking */
#endif
protected:
LaplacianImageFilter()
{
m_UseImageSpacing = true;
}
virtual ~LaplacianImageFilter() {}
/** Standard pipeline method. While this class does not implement a
* ThreadedGenerateData(), its GenerateData() delegates all
* calculations to an NeighborhoodOperatorImageFilter. Since the
* NeighborhoodOperatorImageFilter is multithreaded, this filter is
* multithreaded by default. */
void GenerateData();
void PrintSelf(std::ostream&, Indent) const;
private:
LaplacianImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
bool m_UseImageSpacing;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkLaplacianImageFilter.txx"
#endif
#endif
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