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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.
*
*=========================================================================*/
/*=========================================================================
*
* Portions of this file are subject to the VTK Toolkit Version 3 copyright.
*
* Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
*
* For complete copyright, license and disclaimer of warranty information
* please refer to the NOTICE file at the top of the ITK source tree.
*
*=========================================================================*/
#ifndef itkBSplineResampleImageFilterBase_h
#define itkBSplineResampleImageFilterBase_h
#include <vector>
#include "itkImageLinearIteratorWithIndex.h"
#include "itkImageRegionIterator.h" // Used for the output iterator needs to
// match filter program
#include "itkProgressReporter.h"
#include "itkImageToImageFilter.h"
namespace itk
{
/**
* \class BSplineResampleImageFilterBase
* \brief Uses the "l2" spline pyramid implementation of B-Spline Filters to
* up/down sample an image by a factor of 2.
*
* This class defines N-Dimension B-Spline transformation.
* It is based on:
* [1] M. Unser,
* "Splines: A Perfect Fit for Signal and Image Processing,"
* IEEE Signal Processing Magazine, vol. 16, no. 6, pp. 22-38,
* November 1999.
* [2] M. Unser, A. Aldroubi and M. Eden,
* "B-Spline Signal Processing: Part I--Theory,"
* IEEE Transactions on Signal Processing, vol. 41, no. 2, pp. 821-832,
* February 1993.
* [3] M. Unser, A. Aldroubi and M. Eden,
* "B-Spline Signal Processing: Part II--Efficient Design and Applications,"
* IEEE Transactions on Signal Processing, vol. 41, no. 2, pp. 834-848,
* February 1993.
* And code obtained from bigwww.epfl.ch by Philippe Thevenaz
*
* Limitations: Spline order for the l2 pyramid must be between 0 and 3.
* This code cannot be multi-threaded since the entire image must be
* traversed in the proper order.
* This code cannot be streamed and requires the all of the input image.
* Only up/down samples by a factor of 2.
* This is a base class and is not meant to be instantiated on its own.
* It requires one of the itkBSplineDownsampleImageFilter or
* itkBSplineUpsampleImageFilter classes.
*
* \sa itkBSplineDownsampleImageFilter
* \sa itkBSplineUpsampleImageFilter
* \sa itkBSplineCenteredL2ResampleImageFilterBase
* \sa itkBSplineCenteredResampleImageFilterBase
* \sa itkBSplineL2ResampleImageFilterBase
*
* \ingroup GeometricTransformationFilters
* \ingroup SingleThreaded
* \ingroup CannotBeStreamed
* \ingroup ITKImageGrid
*/
template <typename TInputImage, typename TOutputImage>
class ITK_TEMPLATE_EXPORT BSplineResampleImageFilterBase : public ImageToImageFilter<TInputImage, TOutputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(BSplineResampleImageFilterBase);
/** Standard class type aliases. */
using Self = BSplineResampleImageFilterBase;
using Superclass = ImageToImageFilter<TInputImage, TOutputImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(BSplineResampleImageFilterBase);
/** New macro for creation of through a Smart Pointer */
// Must be instantiated through another class. itkNewMacro( Self );
/** InputInputImage type alias support */
using typename Superclass::InputImageType;
/** Dimension underlying input image. */
static constexpr unsigned int ImageDimension = TInputImage::ImageDimension;
/** Index type alias support */
using IndexType = typename TInputImage::IndexType;
/** Size type alias support */
using SizeType = typename TInputImage::SizeType;
/** Size type alias support */
using RegionType = typename TInputImage::RegionType;
/** OutputImagePixelType type alias support */
using typename Superclass::OutputImagePixelType;
/** Iterator type alias support */
using ConstInputImageIterator = itk::ImageLinearConstIteratorWithIndex<TInputImage>;
/** Iterator type alias support */
using ConstOutputImageIterator = itk::ImageLinearConstIteratorWithIndex<TOutputImage>;
/** Output Iterator type alias support */
using OutputImageIterator = itk::ImageLinearIteratorWithIndex<TOutputImage>;
/** Set the spline order for interpolation. Value must be between 0 and 3 with a
* default of 0. */
void
SetSplineOrder(int splineOrder);
/** Get the spline order */
itkGetConstMacro(SplineOrder, int);
protected:
/** Reduces an N-dimension image by a factor of 2 in each dimension. */
void
ReduceNDImage(OutputImageIterator & outItr);
/** Expands an N-dimension image by a factor of 2 in each dimension. */
void
ExpandNDImage(OutputImageIterator & outItr);
/** Initializes the pyramid spline coefficients. Called when Spline order
* has been set. */
virtual void
InitializePyramidSplineFilter(int SplineOrder);
/** Reduce the input data vector by a factor of 2 and writes the results to the location specified by the output
* Iterator.
*
* \p inTraverseSize is the size of the input vector.
*/
virtual void
Reduce1DImage(const std::vector<double> & in,
OutputImageIterator & out,
unsigned int inTraverseSize,
ProgressReporter & progress);
/** Expand the input data vector by a factor of 2 and writes the results to the location specified by the output
* Iterator
*
* \p inTraverseSize is the size of the in vector.
*/
virtual void
Expand1DImage(const std::vector<double> & in,
OutputImageIterator & out,
unsigned int inTraverseSize,
ProgressReporter & progress);
BSplineResampleImageFilterBase();
~BSplineResampleImageFilterBase() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
int m_SplineOrder{}; // User specified spline order
int m_GSize{}; // downsampling filter size
int m_HSize{}; // upsampling filter size
std::vector<double> m_G{}; // downsampling filter coefficients
std::vector<double> m_H{}; // upsampling filter coefficients
private:
/** Allocate scratch space based on image sizes. */
void
InitializeScratch(SizeType DataLength);
/** Copy a line of data from the input to the m_Scratch for subsequent processing. */
void
CopyInputLineToScratch(ConstInputImageIterator & Iter);
void
CopyOutputLineToScratch(ConstOutputImageIterator & Iter);
void
CopyLineToScratch(ConstInputImageIterator & Iter);
std::vector<double> m_Scratch{}; // temp storage for processing
// of Coefficients
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkBSplineResampleImageFilterBase.hxx"
#endif
#endif
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