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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 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
*/
template< typename TInputImage, typename TOutputImage >
class ITK_TEMPLATE_EXPORT GPUDiscreteGaussianImageFilter :
public GPUImageToImageFilter< TInputImage, TOutputImage, DiscreteGaussianImageFilter< TInputImage, TOutputImage > >
{
public:
/** Standard class typedefs. */
typedef GPUDiscreteGaussianImageFilter Self;
typedef DiscreteGaussianImageFilter< TInputImage, TOutputImage > CPUSuperclass;
typedef GPUImageToImageFilter< TInputImage, TOutputImage, CPUSuperclass > GPUSuperclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(GPUDiscreteGaussianImageFilter, GPUImageToImageFilter);
/** Image type information. */
typedef TInputImage InputImageType;
typedef TOutputImage OutputImageType;
/** Extract some information from the image types. Dimensionality
* of the two images is assumed to be the same. */
itkStaticConstMacro(ImageDimension, unsigned int,
TOutputImage::ImageDimension);
/** 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;
/** Pixel value type for Vector pixel types **/
typedef typename NumericTraits<InputPixelType>::ValueType InputPixelValueType;
typedef typename NumericTraits<OutputPixelType>::ValueType OutputPixelValueType;
typedef OutputPixelType
RealOutputPixelType;
typedef GPUImage< OutputPixelType,
ImageDimension > RealOutputImageType;
typedef typename NumericTraits<RealOutputPixelType>::ValueType
RealOutputPixelValueType;
typedef GPUNeighborhoodOperatorImageFilter< InputImageType, RealOutputImageType,
RealOutputPixelValueType > FirstFilterType;
typedef GPUNeighborhoodOperatorImageFilter< RealOutputImageType, RealOutputImageType,
RealOutputPixelValueType > IntermediateFilterType;
typedef GPUNeighborhoodOperatorImageFilter< RealOutputImageType, OutputImageType,
RealOutputPixelValueType > LastFilterType;
typedef GPUNeighborhoodOperatorImageFilter< InputImageType, OutputImageType,
RealOutputPixelValueType > SingleFilterType;
virtual void GenerateInputRequestedRegion() ITK_OVERRIDE;
protected:
GPUDiscreteGaussianImageFilter();
virtual ~GPUDiscreteGaussianImageFilter() ITK_OVERRIDE {}
void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
/** Standard GPU pipeline method. */
void GPUGenerateData() ITK_OVERRIDE;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(GPUDiscreteGaussianImageFilter);
/** 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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