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77 lines
2.5 KiB
77 lines
2.5 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkImageFFT.h,v $
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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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// .NAME vtkImageFFT - Fast Fourier Transform.
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// .SECTION Description
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// vtkImageFFT implements a 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 a butterfly fitlers 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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#ifndef __vtkImageFFT_h
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#define __vtkImageFFT_h
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#include "vtkImageFourierFilter.h"
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class VTK_IMAGING_EXPORT vtkImageFFT : public vtkImageFourierFilter
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{
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public:
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static vtkImageFFT *New();
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vtkTypeRevisionMacro(vtkImageFFT,vtkImageFourierFilter);
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// Description:
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// Used internally for streaming and threads.
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// Splits output update extent into num pieces.
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// This method needs to be called num times. Results must not overlap for
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// consistent starting extent. Subclass can override this method.
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// This method returns the number of pieces resulting from a
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// successful split. This can be from 1 to "total".
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// If 1 is returned, the extent cannot be split.
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int SplitExtent(int splitExt[6], int startExt[6],
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int num, int total);
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protected:
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vtkImageFFT() {};
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~vtkImageFFT() {};
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virtual int IterativeRequestInformation(vtkInformation* in,
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vtkInformation* out);
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virtual int IterativeRequestUpdateExtent(vtkInformation* in,
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vtkInformation* out);
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void ThreadedExecute(vtkImageData *inData, vtkImageData *outData,
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int outExt[6], int threadId);
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private:
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vtkImageFFT(const vtkImageFFT&); // Not implemented.
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void operator=(const vtkImageFFT&); // Not implemented.
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};
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#endif
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