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64 lines
2.4 KiB
64 lines
2.4 KiB
2 years ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkImageCityBlockDistance.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 vtkImageCityBlockDistance - 1,2 or 3D distance map.
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// .SECTION Description
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// vtkImageCityBlockDistance creates a distance map using the city block
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// (Manhatten) distance measure. The input is a mask. Zero values are
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// considered boundaries. The output pixel is the minimum of the input pixel
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// and the distance to a boundary (or neighbor value + 1 unit).
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// distance values are calculated in pixels.
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// The filter works by taking 6 passes (for 3d distance map): 2 along each
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// axis (forward and backward). Each pass keeps a running minimum distance.
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// For some reason, I preserve the sign if the distance. If the input
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// mask is initially negative, the output distances will be negative.
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// Distances maps can have inside (negative regions)
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// and outsides (positive regions).
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#ifndef __vtkImageCityBlockDistance_h
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#define __vtkImageCityBlockDistance_h
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#include "vtkImageDecomposeFilter.h"
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class VTK_IMAGING_EXPORT vtkImageCityBlockDistance : public vtkImageDecomposeFilter
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{
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public:
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static vtkImageCityBlockDistance *New();
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vtkTypeRevisionMacro(vtkImageCityBlockDistance,vtkImageDecomposeFilter);
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protected:
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vtkImageCityBlockDistance();
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~vtkImageCityBlockDistance() {};
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virtual int IterativeRequestUpdateExtent(vtkInformation* in,
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vtkInformation* out);
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virtual int IterativeRequestData(vtkInformation*,
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vtkInformationVector**,
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vtkInformationVector*);
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void AllocateOutputScalars(vtkImageData *outData,
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int* updateExtent,
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int* wholeExtent);
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private:
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vtkImageCityBlockDistance(const vtkImageCityBlockDistance&); // Not implemented.
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void operator=(const vtkImageCityBlockDistance&); // Not implemented.
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};
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#endif
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