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123 lines
4.8 KiB
123 lines
4.8 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkImageAnisotropicDiffusion2D.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 vtkImageAnisotropicDiffusion2D - edge preserving smoothing.
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//
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// .SECTION Description
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// vtkImageAnisotropicDiffusion2D diffuses a 2d image iteratively.
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// The neighborhood of the diffusion is determined by the instance
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// flags. If "Edges" is on the 4 edge connected voxels
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// are included, and if "Corners" is on, the 4 corner connected voxels
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// are included. "DiffusionFactor" determines how far a pixel value
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// moves toward its neighbors, and is insensitive to the number of
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// neighbors chosen. The diffusion is anisotropic because it only occurs
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// when a gradient measure is below "GradientThreshold". Two gradient measures
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// exist and are toggled by the "GradientMagnitudeThreshold" flag.
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// When "GradientMagnitudeThreshold" is on, the magnitude of the gradient,
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// computed by central differences, above "DiffusionThreshold"
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// a voxel is not modified. The alternative measure examines each
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// neighbor independently. The gradient between the voxel and the neighbor
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// must be below the "DiffusionThreshold" for diffusion to occur with
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// THAT neighbor.
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// .SECTION See Also
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// vtkImageAnisotropicDiffusion3D
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#ifndef __vtkImageAnisotropicDiffusion2D_h
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#define __vtkImageAnisotropicDiffusion2D_h
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#include "vtkImageSpatialAlgorithm.h"
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class VTK_IMAGING_EXPORT vtkImageAnisotropicDiffusion2D : public vtkImageSpatialAlgorithm
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{
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public:
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static vtkImageAnisotropicDiffusion2D *New();
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vtkTypeRevisionMacro(vtkImageAnisotropicDiffusion2D,vtkImageSpatialAlgorithm);
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void PrintSelf(ostream& os, vtkIndent indent);
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// Description:
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// This method sets the number of interations which also affects the
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// input neighborhood needed to compute one output pixel. Each iterations
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// requires an extra pixel layer on the neighborhood. This is only relavent
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// when you are trying to stream or are requesting a sub extent of the "wholeExtent".
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void SetNumberOfIterations(int num);
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// Description:
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// Get the number of iterations.
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vtkGetMacro(NumberOfIterations,int);
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// Description:
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// Set/Get the difference threshold that stops diffusion.
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// when the difference between two pixel is greater than this threshold,
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// the pixels are not diffused. This causes diffusion to avoid sharp edges.
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// If the GradientMagnitudeThreshold is set, then gradient magnitude is used
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// for comparison instead of pixel differences.
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vtkSetMacro(DiffusionThreshold,double);
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vtkGetMacro(DiffusionThreshold,double);
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// Description:
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// The diffusion factor specifies how much neighboring pixels effect each other.
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// No diffusion occurs with a factor of 0, and a diffusion factor of 1 causes
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// the pixel to become the average of all its neighbors.
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vtkSetMacro(DiffusionFactor,double);
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vtkGetMacro(DiffusionFactor,double);
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// Description:
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// Choose neighbors to diffuse (6 faces, 12 edges, 8 corners).
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vtkSetMacro(Faces,int);
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vtkGetMacro(Faces,int);
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vtkBooleanMacro(Faces,int);
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vtkSetMacro(Edges,int);
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vtkGetMacro(Edges,int);
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vtkBooleanMacro(Edges,int);
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vtkSetMacro(Corners,int);
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vtkGetMacro(Corners,int);
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vtkBooleanMacro(Corners,int);
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// Description:
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// Switch between gradient magnitude threshold and pixel gradient threshold.
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vtkSetMacro(GradientMagnitudeThreshold,int);
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vtkGetMacro(GradientMagnitudeThreshold,int);
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vtkBooleanMacro(GradientMagnitudeThreshold,int);
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protected:
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vtkImageAnisotropicDiffusion2D();
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~vtkImageAnisotropicDiffusion2D() {};
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int NumberOfIterations;
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double DiffusionThreshold;
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double DiffusionFactor;
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// to determine which neighbors to diffuse
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int Faces;
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int Edges;
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int Corners;
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// What threshold to use
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int GradientMagnitudeThreshold;
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void ThreadedRequestData(vtkInformation *request,
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vtkInformationVector **inputVector,
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vtkInformationVector *outputVector,
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vtkImageData ***inData, vtkImageData **outData,
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int extent[6], int id);
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void Iterate(vtkImageData *in, vtkImageData *out,
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double ar0, double ar1, int *coreExtent, int count);
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private:
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vtkImageAnisotropicDiffusion2D(const vtkImageAnisotropicDiffusion2D&); // Not implemented.
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void operator=(const vtkImageAnisotropicDiffusion2D&); // Not implemented.
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};
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#endif
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