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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 itkCyclicShiftImageFilter_h
#define itkCyclicShiftImageFilter_h
#include "itkImageToImageFilter.h"
namespace itk
{
/** \class CyclicShiftImageFilter
* \brief Perform a cyclic spatial shift of image intensities on the
* image grid.
*
* This filter supports arbitrary cyclic shifts of pixel values on the
* image grid. If the Shift is set to [xOff, yOff], the value of the
* pixel at [0, 0] in the input image will be the value of the pixel
* in the output image at index [xOff modulo xSize, yOff modulo ySize]
* where xSize and ySize are the sizes of the image in the x and y
* dimensions, respectively. If a pixel value is moved across a
* boundary, the pixel value is wrapped around that boundary. For
* example, if the image is 40-by-40 and the Shift is [13, 47], then
* the value of the pixel at [0, 0] in the input image will be the
* value of the pixel in the output image at index [13, 7].
*
* Negative Shifts are supported. This filter also works with images
* whose largest possible region starts at a non-zero index.
*
* \ingroup ITKImageGrid
*/
template< typename TInputImage, typename TOutputImage = TInputImage >
class ITK_TEMPLATE_EXPORT CyclicShiftImageFilter:
public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
/** Standard class typedefs. */
typedef CyclicShiftImageFilter Self;
typedef ImageToImageFilter< TInputImage, TOutputImage > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Some convenient typedefs. */
typedef TInputImage InputImageType;
typedef TOutputImage OutputImageType;
typedef typename InputImageType::Pointer InputImagePointer;
typedef typename InputImageType::ConstPointer InputImageConstPointer;
typedef typename InputImageType::RegionType InputImageRegionType;
typedef typename InputImageType::PixelType InputImagePixelType;
typedef typename OutputImageType::Pointer OutputImagePointer;
typedef typename OutputImageType::ConstPointer OutputImageConstPointer;
typedef typename OutputImageType::RegionType OutputImageRegionType;
typedef typename OutputImageType::PixelType OutputImagePixelType;
typedef typename OutputImageType::IndexType IndexType;
typedef typename OutputImageType::SizeType SizeType;
typedef typename OutputImageType::OffsetType OffsetType;
typedef typename OutputImageType::OffsetValueType OffsetValueType;
/** ImageDimension constants */
itkStaticConstMacro(ImageDimension, unsigned int,
TInputImage::ImageDimension);
/** Standard New method. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(CyclicShiftImageFilter, ImageToImageFilter);
/** Set/get the shift. Shifts may be positive or negative. */
itkSetMacro(Shift, OffsetType);
itkGetConstMacro(Shift, OffsetType);
protected:
CyclicShiftImageFilter();
~CyclicShiftImageFilter() ITK_OVERRIDE {}
void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
/** This filter needs the entire input be available so it needs to
* provide an implementation of GenerateInputRequestedRegion(). */
void GenerateInputRequestedRegion() ITK_OVERRIDE;
/** This filter can be threaded. */
void ThreadedGenerateData(const OutputImageRegionType &
outputRegionForThread,
ThreadIdType threadId) ITK_OVERRIDE;
/** Protected so that subclasses may set it without calling
Modified(). */
OffsetType m_Shift;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(CyclicShiftImageFilter);
}; // end of class
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkCyclicShiftImageFilter.hxx"
#endif
#endif
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