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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkLaplacianImageFilter_h
#define itkLaplacianImageFilter_h
#include "itkImageToImageFilter.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
* \ingroup ITKImageFeature
*
* \wiki
* \wikiexample{ImageProcessing/LaplacianImageFilter,Compute the Laplacian of an image}
* \endwiki
*/
template< typename TInputImage, typename TOutputImage >
class ITK_TEMPLATE_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() ITK_OVERRIDE;
/** Enable/Disable using the image spacing information in
* calculations. Use this option if you want derivatives in
* physical space. Default is UseImageSpacingOn. */
itkBooleanMacro( UseImageSpacing );
/** Set/Get whether or not the filter will use the spacing of the input
image in its calculations */
itkSetMacro(UseImageSpacing, bool);
itkGetConstMacro(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() ITK_OVERRIDE {}
/** 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() ITK_OVERRIDE;
void PrintSelf(std::ostream &, Indent) const ITK_OVERRIDE;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(LaplacianImageFilter);
bool m_UseImageSpacing;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkLaplacianImageFilter.hxx"
#endif
#endif
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