/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkImageNonMaximumSuppression.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$
  Thanks:    Thanks to C. Charles Law who developed this class.

Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/
// .NAME vtkImageNonMaximumSuppression - Performs non-maximum suppression
// .SECTION Description
// vtkImageNonMaximumSuppression Sets to zero any pixel that is not a peak.
// If a pixel has a neighbor along the vector that has larger magnitude, the
// smaller pixel is set to zero.  The filter takes two inputs: a magnitude
// and a vector.  Output is magnitude information and is always in floats.
// Typically this filter is used with vtkImageGradient and
// vtkImageGradientMagnitude as inputs.


#ifndef __vtkImageNonMaximumSuppression_h
#define __vtkImageNonMaximumSuppression_h

#define VTK_IMAGE_NON_MAXIMUM_SUPPRESSION_MAGNITUDE_INPUT 0
#define VTK_IMAGE_NON_MAXIMUM_SUPPRESSION_VECTOR_INPUT 1

#include "vtkImageTwoInputFilter.h"

class VTK_EXPORT vtkImageNonMaximumSuppression : public vtkImageTwoInputFilter
{
public:
  static vtkImageNonMaximumSuppression *New();
  vtkTypeMacro(vtkImageNonMaximumSuppression,vtkImageTwoInputFilter);
  void PrintSelf(ostream& os, vtkIndent indent);
  
  // Description:
  // Set the magnitude and vector inputs.
  void SetMagnitudeInput(vtkImageData *input) {this->SetInput1(input);};
  void SetVectorInput(vtkImageData *input) {this->SetInput2(input);};
  
  // Description:
  // If "HandleBoundariesOn" then boundary pixels are duplicated
  // So central differences can get values.
  vtkSetMacro(HandleBoundaries, int);
  vtkGetMacro(HandleBoundaries, int);
  vtkBooleanMacro(HandleBoundaries, int);

  // Description:
  // Determines how the input is interpreted (set of 2d slices or a 3D volume)
  vtkSetClampMacro(Dimensionality,int,2,3);
  vtkGetMacro(Dimensionality,int);
  
protected:
  vtkImageNonMaximumSuppression();
  ~vtkImageNonMaximumSuppression() {};
  vtkImageNonMaximumSuppression(const vtkImageNonMaximumSuppression&) {};
  void operator=(const vtkImageNonMaximumSuppression&) {};

  int HandleBoundaries;
  int Dimensionality;
  
  void ExecuteInformation(vtkImageData **inDatas, vtkImageData *outData);
  virtual void ComputeInputUpdateExtent(int inExt[6], int outExt[6],
					int whichInput);
  void ExecuteInformation(){this->vtkImageTwoInputFilter::ExecuteInformation();};
  void ThreadedExecute(vtkImageData **inDatas, vtkImageData *outData,
		       int extent[6], int id);
  
};

#endif



