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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 itkContourDirectedMeanDistanceImageFilter_h
#define itkContourDirectedMeanDistanceImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkNumericTraits.h"
#include "itkArray.h"
#include "itkImage.h"
namespace itk
{
/** \class ContourDirectedMeanDistanceImageFilter
* \brief Computes the directed Mean distance between the boundaries of
* non-zero pixel regions of two images.
*
* ContourDirectedMeanDistanceImageFilter computes the distance between the set
* non-zero pixels of two images using the following formula:
* \f[ h(A,B) = \mathrm{mean}_{a \in A} \min_{b \in B} \| a - b\| \f]
* where \f$A\f$ and \f$B\f$ are respectively the set of non-zero pixels
* in the first and second input images. It identifies the point \f$ a \in A \f$
* that is farthest from any point of \f$B\f$ and measures the distance from \f$a\f$
* to the nearest neighbor in \f$B\f$. Note that this function is not
* is not symmetric and hence is not a true distance.
*
* In particular, this filter uses the SignedMaurerDistanceMapImageFilter
* inside to compute distance map from all non-zero pixels in the second image.
* It then computes the mean distance (in pixels) within the boundary pixels
* of non-zero regions in the first image.
*
* This filter requires the largest possible region of the first image and the
* same corresponding region in the second image. It behaves as filter with
* two input and one output. Thus it can be inserted in a pipeline with other
* filters. The filter passes the first input through unmodified.
*
* This filter is templated over the two input image type. It assume
* both image have the same number of dimensions.
*
* \sa SignedMaurerDistanceMapImageFilter
*
* \ingroup MultiThreaded
*
* \author Teo Popa, ISIS Center, Georgetown University
*
* \ingroup ITKDistanceMap
*/
template< typename TInputImage1, typename TInputImage2 >
class ITK_TEMPLATE_EXPORT ContourDirectedMeanDistanceImageFilter:
public ImageToImageFilter< TInputImage1, TInputImage1 >
{
public:
/** Standard Self typedef */
typedef ContourDirectedMeanDistanceImageFilter Self;
typedef ImageToImageFilter< TInputImage1, TInputImage1 > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(ContourDirectedMeanDistanceImageFilter, ImageToImageFilter);
/** Image related typedefs. */
typedef TInputImage1 InputImage1Type;
typedef TInputImage2 InputImage2Type;
typedef typename TInputImage1::Pointer InputImage1Pointer;
typedef typename TInputImage2::Pointer InputImage2Pointer;
typedef typename TInputImage1::ConstPointer InputImage1ConstPointer;
typedef typename TInputImage2::ConstPointer InputImage2ConstPointer;
typedef typename TInputImage1::RegionType RegionType;
typedef typename TInputImage1::SizeType SizeType;
typedef typename TInputImage1::IndexType IndexType;
typedef typename TInputImage1::PixelType InputImage1PixelType;
typedef typename TInputImage2::PixelType InputImage2PixelType;
/** Image related typedefs. */
itkStaticConstMacro(ImageDimension, unsigned int,
TInputImage1::ImageDimension);
/** Type to use form computations. */
typedef typename NumericTraits< InputImage1PixelType >::RealType RealType;
/** Set the first input. */
void SetInput1(const InputImage1Type *image);
/** Set the second input. */
void SetInput2(const InputImage2Type *image);
/** Get the first input. */
const InputImage1Type * GetInput1();
/** Get the second input. */
const InputImage2Type * GetInput2();
/** Return the computed directed Mean distance. */
itkGetConstMacro(ContourDirectedMeanDistance, RealType);
/** Set if image spacing should be used in computing distances. */
itkSetMacro( UseImageSpacing, bool );
itkGetConstMacro( UseImageSpacing, bool );
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro( InputHasNumericTraitsCheck,
( Concept::HasNumericTraits< InputImage1PixelType > ) );
// End concept checking
#endif
protected:
ContourDirectedMeanDistanceImageFilter();
~ContourDirectedMeanDistanceImageFilter() ITK_OVERRIDE {}
void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
/** Pass the input through unmodified. Do this by Grafting in the
AllocateOutputs method. */
void AllocateOutputs() ITK_OVERRIDE;
/** Initialize some accumulators before the threads run. */
void BeforeThreadedGenerateData() ITK_OVERRIDE;
/** Do final mean and variance computation from data accumulated in threads.
*/
void AfterThreadedGenerateData() ITK_OVERRIDE;
/** Multi-thread version GenerateData. */
void ThreadedGenerateData(const RegionType &
outputRegionForThread,
ThreadIdType threadId) ITK_OVERRIDE;
// Override since the filter needs all the data for the algorithm
void GenerateInputRequestedRegion() ITK_OVERRIDE;
// Override since the filter produces all of its output
void EnlargeOutputRequestedRegion(DataObject *data) ITK_OVERRIDE;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(ContourDirectedMeanDistanceImageFilter);
typedef Image< RealType, itkGetStaticConstMacro(ImageDimension) > DistanceMapType;
typename DistanceMapType::Pointer m_DistanceMap;
Array< RealType > m_MeanDistance;
Array< IdentifierType > m_Count;
RealType m_ContourDirectedMeanDistance;
bool m_UseImageSpacing;
}; // end of class
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkContourDirectedMeanDistanceImageFilter.hxx"
#endif
#endif
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