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