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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 itkGPUDiscreteGaussianImageFilter_h
#define itkGPUDiscreteGaussianImageFilter_h
#include "itkGPUImage.h"
#include "itkGPUImageToImageFilter.h"
#include "itkGPUNeighborhoodOperatorImageFilter.h"
#include "itkDiscreteGaussianImageFilter.h"
namespace itk
{
/**
* \class GPUDiscreteGaussianImageFilter
* \brief Blurs an image by separable convolution with discrete gaussian kernels.
* This filter performs Gaussian blurring by separable convolution of an image
* and a discrete Gaussian operator (kernel). GPUNeighborhoodOperatorImageFilter
* is used to compute 1D directional discrete Gaussian filtering for each axis.
*
* The variance or standard deviation (sigma) will be evaluated as pixel units
* if SetUseImageSpacing is off (false) or as physical units if
* SetUseImageSpacing is on (true, default). The variance can be set
* independently in each dimension.
*
* When the Gaussian kernel is small, this filter tends to run faster than
* itk::RecursiveGaussianImageFilter.
*
* \ingroup ITKGPUSmoothing
*
* \sphinx
* \sphinxexample{Filtering/Smoothing/SmoothImageWithDiscreteGaussianFilter,Smooth Image With Discrete Gaussian Filter}
* \endsphinx
*/
template <typename TInputImage, typename TOutputImage>
class ITK_TEMPLATE_EXPORT GPUDiscreteGaussianImageFilter
: public GPUImageToImageFilter<TInputImage, TOutputImage, DiscreteGaussianImageFilter<TInputImage, TOutputImage>>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(GPUDiscreteGaussianImageFilter);
/** Standard class type aliases. */
using Self = GPUDiscreteGaussianImageFilter;
using CPUSuperclass = DiscreteGaussianImageFilter<TInputImage, TOutputImage>;
using GPUSuperclass = GPUImageToImageFilter<TInputImage, TOutputImage, CPUSuperclass>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(GPUDiscreteGaussianImageFilter);
/** Image type information. */
using InputImageType = TInputImage;
using OutputImageType = TOutputImage;
/** Extract some information from the image types. Dimensionality
* of the two images is assumed to be the same. */
static constexpr unsigned int ImageDimension = TOutputImage::ImageDimension;
/** Extract some information from the image types. Dimensionality
* of the two images is assumed to be the same. */
using OutputPixelType = typename TOutputImage::PixelType;
using OutputInternalPixelType = typename TOutputImage::InternalPixelType;
using InputPixelType = typename TInputImage::PixelType;
using InputInternalPixelType = typename TInputImage::InternalPixelType;
/** Pixel value type for Vector pixel types **/
using InputPixelValueType = typename NumericTraits<InputPixelType>::ValueType;
using OutputPixelValueType = typename NumericTraits<OutputPixelType>::ValueType;
using RealOutputPixelType = OutputPixelType;
using RealOutputImageType = GPUImage<OutputPixelType, ImageDimension>;
using RealOutputPixelValueType = typename NumericTraits<RealOutputPixelType>::ValueType;
using FirstFilterType =
GPUNeighborhoodOperatorImageFilter<InputImageType, RealOutputImageType, RealOutputPixelValueType>;
using IntermediateFilterType =
GPUNeighborhoodOperatorImageFilter<RealOutputImageType, RealOutputImageType, RealOutputPixelValueType>;
using LastFilterType =
GPUNeighborhoodOperatorImageFilter<RealOutputImageType, OutputImageType, RealOutputPixelValueType>;
using SingleFilterType =
GPUNeighborhoodOperatorImageFilter<InputImageType, OutputImageType, RealOutputPixelValueType>;
void
GenerateInputRequestedRegion() override;
protected:
GPUDiscreteGaussianImageFilter();
~GPUDiscreteGaussianImageFilter() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
/** Standard GPU pipeline method. */
void
GPUGenerateData() override;
private:
/** Intermediate 1D Gaussian filters */
typename FirstFilterType::Pointer m_FirstFilter{};
typename LastFilterType::Pointer m_LastFilter{};
std::vector<typename IntermediateFilterType::Pointer> m_IntermediateFilters{};
typename SingleFilterType::Pointer m_SingleFilter{};
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkGPUDiscreteGaussianImageFilter.hxx"
#endif
#endif
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