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/*=========================================================================
Program: Visualization Toolkit
Module: $RCSfile: vtkImageButterworthLowPass.h,v $
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// .NAME vtkImageButterworthLowPass - Frequency domain Low pass.
// .SECTION Description
// This filter only works on an image after it has been converted to
// frequency domain by a vtkImageFFT filter. A vtkImageRFFT filter
// can be used to convert the output back into the spatial domain.
// vtkImageButterworthLowPass the high frequency components are
// attenuated. Input and output are in doubles, with two components
// (complex numbers).
// out(i, j) = (1 + pow(CutOff/Freq(i,j), 2*Order));
// .SECTION See Also
// vtkImageButterworthHighPass vtkImageFFT vtkImageRFFT
#ifndef __vtkImageButterworthLowPass_h
#define __vtkImageButterworthLowPass_h
#include "vtkThreadedImageAlgorithm.h"
class VTK_IMAGING_EXPORT vtkImageButterworthLowPass : public vtkThreadedImageAlgorithm
{
public:
static vtkImageButterworthLowPass *New();
vtkTypeRevisionMacro(vtkImageButterworthLowPass,vtkThreadedImageAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Set/Get the cutoff frequency for each axis.
// The values are specified in the order X, Y, Z, Time.
// Units: Cycles per world unit (as defined by the data spacing).
vtkSetVector3Macro(CutOff,double);
void SetCutOff(double v) {this->SetCutOff(v, v, v);}
void SetXCutOff(double v);
void SetYCutOff(double v);
void SetZCutOff(double v);
vtkGetVector3Macro(CutOff,double);
double GetXCutOff() {return this->CutOff[0];}
double GetYCutOff() {return this->CutOff[1];}
double GetZCutOff() {return this->CutOff[2];}
// Description:
// The order determines sharpness of the cutoff curve.
vtkSetMacro(Order, int);
vtkGetMacro(Order, int);
protected:
vtkImageButterworthLowPass();
~vtkImageButterworthLowPass() {};
int Order;
double CutOff[3];
void ThreadedRequestData( vtkInformation *request,
vtkInformationVector **inputVector,
vtkInformationVector *outputVector,
vtkImageData ***inData, vtkImageData **outData,
int outExt[6], int id);
private:
vtkImageButterworthLowPass(const vtkImageButterworthLowPass&); // Not implemented.
void operator=(const vtkImageButterworthLowPass&); // Not implemented.
};
#endif
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