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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImageGradient.h
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 vtkImageGradient - Computes the gradient vector.
// .SECTION Description
// vtkImageGradient computes the gradient vector of an image. The
// vector results are stored as scalar components. The Dimensionality
// determines whether to perform a 2d or 3d gradient. The default is
// two dimensional XY gradient. OutputScalarType is always
// double. Gradient is computed using central differences.
#ifndef vtkImageGradient_h
#define vtkImageGradient_h
#include "vtkImagingGeneralModule.h" // For export macro
#include "vtkThreadedImageAlgorithm.h"
class VTKIMAGINGGENERAL_EXPORT vtkImageGradient : public vtkThreadedImageAlgorithm
{
public:
static vtkImageGradient *New();
vtkTypeMacro(vtkImageGradient,vtkThreadedImageAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Determines how the input is interpreted (set of 2d slices ...)
vtkSetClampMacro(Dimensionality,int,2,3);
vtkGetMacro(Dimensionality,int);
// Description:
// Get/Set whether to handle boundaries. If enabled, boundary
// pixels are treated as duplicated so that central differencing
// works for the boundary pixels. If disabled, the output whole
// extent of the image is reduced by one pixel.
vtkSetMacro(HandleBoundaries, int);
vtkGetMacro(HandleBoundaries, int);
vtkBooleanMacro(HandleBoundaries, int);
protected:
vtkImageGradient();
~vtkImageGradient() {}
int HandleBoundaries;
int Dimensionality;
virtual int RequestInformation (vtkInformation*,
vtkInformationVector**,
vtkInformationVector*);
virtual int RequestUpdateExtent(vtkInformation*,
vtkInformationVector**,
vtkInformationVector*);
virtual int RequestData(vtkInformation*,
vtkInformationVector**,
vtkInformationVector*);
void ThreadedRequestData(vtkInformation*,
vtkInformationVector**,
vtkInformationVector*,
vtkImageData*** inData,
vtkImageData** outData,
int outExt[6],
int threadId);
private:
vtkImageGradient(const vtkImageGradient&); // Not implemented.
void operator=(const vtkImageGradient&); // Not implemented.
};
#endif
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