61 lines
2.3 KiB
C
61 lines
2.3 KiB
C
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkImageCityBlockDistance.h
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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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/**
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* @class vtkImageCityBlockDistance
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* @brief 1,2 or 3D distance map.
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*
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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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*/
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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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#include "vtkImagingGeneralModule.h" // For export macro
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class VTKIMAGINGGENERAL_EXPORT vtkImageCityBlockDistance : public vtkImageDecomposeFilter
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{
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public:
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static vtkImageCityBlockDistance* New();
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vtkTypeMacro(vtkImageCityBlockDistance, vtkImageDecomposeFilter);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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protected:
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vtkImageCityBlockDistance();
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~vtkImageCityBlockDistance() override = default;
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int IterativeRequestUpdateExtent(vtkInformation* in, vtkInformation* out) override;
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int IterativeRequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;
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void AllocateOutputScalars(
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vtkImageData* outData, int* updateExtent, int* wholeExtent, vtkInformation* outInfo);
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private:
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vtkImageCityBlockDistance(const vtkImageCityBlockDistance&) = delete;
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void operator=(const vtkImageCityBlockDistance&) = delete;
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};
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#endif
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