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66 lines
2.4 KiB
C
66 lines
2.4 KiB
C
3 weeks ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkImageRFFT.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkImageRFFT
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* @brief Reverse Fast Fourier Transform.
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*
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* vtkImageRFFT implements the reverse fast Fourier transform. The input
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* can have real or complex data in any components and data types, but
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* the output is always complex doubles with real values in component0, and
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* imaginary values in component1. The filter is fastest for images that
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* have power of two sizes. The filter uses butterfly filters for each
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* prime factor of the dimension. This makes images with prime number dimensions
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* (i.e. 17x17) much slower to compute. Multi dimensional (i.e volumes)
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* FFT's are decomposed so that each axis executes in series.
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* In most cases the RFFT will produce an image whose imaginary values are all
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* zero's. In this case vtkImageExtractComponents can be used to remove
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* this imaginary components leaving only the real image.
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*
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* @sa
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* vtkImageExtractComponenents
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*/
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#ifndef vtkImageRFFT_h
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#define vtkImageRFFT_h
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#include "vtkImageFourierFilter.h"
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#include "vtkImagingFourierModule.h" // For export macro
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class VTKIMAGINGFOURIER_EXPORT vtkImageRFFT : public vtkImageFourierFilter
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{
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public:
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static vtkImageRFFT* New();
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vtkTypeMacro(vtkImageRFFT, vtkImageFourierFilter);
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protected:
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vtkImageRFFT() {}
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~vtkImageRFFT() override {}
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int IterativeRequestInformation(vtkInformation* in, vtkInformation* out) override;
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int IterativeRequestUpdateExtent(vtkInformation* in, vtkInformation* out) override;
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void ThreadedRequestData(vtkInformation* vtkNotUsed(request), vtkInformationVector** inputVector,
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vtkInformationVector* vtkNotUsed(outputVector), vtkImageData*** inDataVec,
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vtkImageData** outDataVec, int outExt[6], int threadId) override;
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private:
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vtkImageRFFT(const vtkImageRFFT&) = delete;
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void operator=(const vtkImageRFFT&) = delete;
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};
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#endif
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// VTK-HeaderTest-Exclude: vtkImageRFFT.h
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