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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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 itkBinShrinkImageFilter_h
#define itkBinShrinkImageFilter_h
#include "itkShrinkImageFilter.h"
#include <type_traits>
namespace itk
{
/**
* \class BinShrinkImageFilter
* \brief Reduce the size of an image by an integer factor in each
* dimension while performing averaging of an input neighborhood.
*
*
* The output image size in each dimension is given by:
*
* outputSize[j] = max( std::floor(inputSize[j]/shrinkFactor[j]), 1 );
*
* The algorithm implemented can be describe with the following
* equation for 2D:
* \f[
* \mathsf{I}_{out}(x_o,x_1) =
* \frac{\sum_{i=0}^{f_0}\sum_{j=0}^{f_1}\mathsf{I}_{in}(f_0 x_o+i,f_1 x_1+j)}{f_0 f_1}
* \f]
*
* This filter is implemented so that the starting extent of the first
* pixel of the output matches that of the input.
*
* \image html BinShrinkGrid.png "The change in image geometry from a 5x5 image binned by a factor of 2x2."
*
* This code was contributed in the Insight Journal paper:
* "BinShrink: A multi-resolution filter with cache efficient averaging"
* by Lowekamp B., Chen D.
* https://www.insight-journal.org/browse/publication/912
*
* \ingroup ITKImageGrid
* \ingroup Streamed
*/
template <typename TInputImage, typename TOutputImage>
class ITK_TEMPLATE_EXPORT BinShrinkImageFilter : public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(BinShrinkImageFilter);
/** Standard class type aliases. */
using Self = BinShrinkImageFilter;
using Superclass = ImageToImageFilter<TInputImage, TOutputImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(BinShrinkImageFilter);
/** Typedef to images */
using OutputImageType = TOutputImage;
using InputImageType = TInputImage;
using OutputImagePointer = typename OutputImageType::Pointer;
using InputImagePointer = typename InputImageType::Pointer;
using InputImageConstPointer = typename InputImageType::ConstPointer;
using OutputOffsetType = typename TOutputImage::OffsetType;
using OutputIndexType = typename TOutputImage::IndexType;
using InputIndexType = typename TInputImage::IndexType;
/** Typedef to describe the output image region type. */
using OutputImageRegionType = typename TOutputImage::RegionType;
/** ImageDimension enumeration. */
static constexpr unsigned int ImageDimension = TInputImage::ImageDimension;
static constexpr unsigned int OutputImageDimension = TOutputImage::ImageDimension;
using ShrinkFactorsType = FixedArray<unsigned int, ImageDimension>;
/** Set the shrink factors. Values are clamped to
* a minimum value of 1. Default is 1 for all dimensions. */
itkSetMacro(ShrinkFactors, ShrinkFactorsType);
void
SetShrinkFactors(unsigned int factor);
void
SetShrinkFactor(unsigned int i, unsigned int factor);
/** Get the shrink factors. */
itkGetConstReferenceMacro(ShrinkFactors, ShrinkFactorsType);
void
GenerateOutputInformation() override;
/** BinShrinkImageFilter needs a larger input requested region than the output
* requested region. As such, BinShrinkImageFilter needs to provide an
* implementation for GenerateInputRequestedRegion() in order to inform the
* pipeline execution model.
* \sa ProcessObject::GenerateInputRequestedRegion() */
void
GenerateInputRequestedRegion() override;
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(InputConvertibleToOutputCheck,
(Concept::Convertible<typename TInputImage::PixelType, typename TOutputImage::PixelType>));
itkConceptMacro(SameDimensionCheck, (Concept::SameDimension<ImageDimension, OutputImageDimension>));
/** End concept checking */
#endif
protected:
BinShrinkImageFilter();
void
PrintSelf(std::ostream & os, Indent indent) const override;
void
DynamicThreadedGenerateData(const OutputImageRegionType & outputRegionForThread) override;
private:
ShrinkFactorsType m_ShrinkFactors{};
/** Round different pixel types. */
template <class TOutputType, class TInputType>
std::enable_if_t<std::numeric_limits<TOutputType>::is_integer, TOutputType>
RoundIfInteger(TInputType input)
{
return Math::Round<TOutputType>(input);
}
// For Non-fundamental types numeric_limits is not specialized, and
// is_integer defaults to false.
template <class TOutputType, class TInputType>
std::enable_if_t<!std::numeric_limits<TOutputType>::is_integer, TOutputType>
RoundIfInteger(const TInputType & input, ...)
{
return static_cast<TOutputType>(input);
}
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkBinShrinkImageFilter.hxx"
#endif
#endif
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