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85 lines
3.3 KiB
85 lines
3.3 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkSubPixelPositionEdgels.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 vtkSubPixelPositionEdgels - adjust edgel locations based on gradients.
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// .SECTION Description
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// vtkSubPixelPositionEdgels is a filter that takes a series of linked
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// edgels (digital curves) and gradient maps as input. It then adjusts
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// the edgel locations based on the gradient data. Specifically, the
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// algorithm first determines the neighboring gradient magnitudes of
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// an edgel using simple interpolation of its neighbors. It then fits
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// the following three data points: negative gradient direction
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// gradient magnitude, edgel gradient magnitude and positive gradient
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// direction gradient magnitude to a quadratic function. It then
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// solves this quadratic to find the maximum gradient location along
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// the gradient orientation. It then modifies the edgels location
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// along the gradient orientation to the calculated maximum
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// location. This algorithm does not adjust an edgel in the direction
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// orthogonal to its gradient vector.
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// .SECTION see also
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// vtkImageData vtkImageGradient vtkLinkEdgels
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#ifndef __vtkSubPixelPositionEdgels_h
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#define __vtkSubPixelPositionEdgels_h
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#include "vtkPolyDataAlgorithm.h"
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class vtkStructuredPoints;
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class vtkDataArray;
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class VTK_GRAPHICS_EXPORT vtkSubPixelPositionEdgels : public vtkPolyDataAlgorithm
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{
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public:
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static vtkSubPixelPositionEdgels *New();
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vtkTypeRevisionMacro(vtkSubPixelPositionEdgels,vtkPolyDataAlgorithm);
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void PrintSelf(ostream& os, vtkIndent indent);
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// Description:
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// Set/Get the gradient data for doing the position adjustments.
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void SetGradMaps(vtkStructuredPoints *gm);
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vtkStructuredPoints *GetGradMaps();
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// Description:
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// These methods can make the positioning look for a target scalar value
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// instead of looking for a maximum.
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vtkSetMacro(TargetFlag, int);
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vtkGetMacro(TargetFlag, int);
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vtkBooleanMacro(TargetFlag, int);
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vtkSetMacro(TargetValue, double);
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vtkGetMacro(TargetValue, double);
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protected:
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vtkSubPixelPositionEdgels();
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~vtkSubPixelPositionEdgels();
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// Usual data generation method
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virtual int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);
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virtual int FillInputPortInformation(int port, vtkInformation *info);
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void Move(int xdim, int ydim, int zdim, int x, int y,
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float *img, vtkDataArray *inVecs,
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double *result, int z, double *aspect, double *resultNormal);
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void Move(int xdim, int ydim, int zdim, int x, int y,
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double *img, vtkDataArray *inVecs,
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double *result, int z, double *aspect, double *resultNormal);
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// extension for target instead of maximum
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int TargetFlag;
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double TargetValue;
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private:
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vtkSubPixelPositionEdgels(const vtkSubPixelPositionEdgels&); // Not implemented.
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void operator=(const vtkSubPixelPositionEdgels&); // Not implemented.
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};
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#endif
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