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86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkImageButterworthLowPass.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 vtkImageButterworthLowPass
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* @brief Frequency domain Low pass.
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*
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* This filter only works on an image after it has been converted to
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* frequency domain by a vtkImageFFT filter. A vtkImageRFFT filter
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* can be used to convert the output back into the spatial domain.
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* vtkImageButterworthLowPass the high frequency components are
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* attenuated. Input and output are in doubles, with two components
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* (complex numbers).
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* out(i, j) = (1 + pow(CutOff/Freq(i,j), 2*Order));
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*
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* @sa
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* vtkImageButterworthHighPass vtkImageFFT vtkImageRFFT
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*/
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#ifndef vtkImageButterworthLowPass_h
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#define vtkImageButterworthLowPass_h
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#include "vtkImagingFourierModule.h" // For export macro
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#include "vtkThreadedImageAlgorithm.h"
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class VTKIMAGINGFOURIER_EXPORT vtkImageButterworthLowPass : public vtkThreadedImageAlgorithm
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{
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public:
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static vtkImageButterworthLowPass* New();
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vtkTypeMacro(vtkImageButterworthLowPass, vtkThreadedImageAlgorithm);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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//@{
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/**
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* Set/Get the cutoff frequency for each axis.
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* The values are specified in the order X, Y, Z, Time.
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* Units: Cycles per world unit (as defined by the data spacing).
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*/
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vtkSetVector3Macro(CutOff, double);
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void SetCutOff(double v) { this->SetCutOff(v, v, v); }
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void SetXCutOff(double v);
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void SetYCutOff(double v);
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void SetZCutOff(double v);
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vtkGetVector3Macro(CutOff, double);
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double GetXCutOff() { return this->CutOff[0]; }
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double GetYCutOff() { return this->CutOff[1]; }
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double GetZCutOff() { return this->CutOff[2]; }
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//@}
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//@{
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/**
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* The order determines sharpness of the cutoff curve.
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*/
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vtkSetMacro(Order, int);
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vtkGetMacro(Order, int);
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//@}
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protected:
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vtkImageButterworthLowPass();
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~vtkImageButterworthLowPass() override {}
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int Order;
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double CutOff[3];
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void ThreadedRequestData(vtkInformation* request, vtkInformationVector** inputVector,
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vtkInformationVector* outputVector, vtkImageData*** inData, vtkImageData** outData,
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int outExt[6], int id) override;
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private:
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vtkImageButterworthLowPass(const vtkImageButterworthLowPass&) = delete;
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void operator=(const vtkImageButterworthLowPass&) = delete;
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};
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#endif
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