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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
* @class vtkImageQuantizeRGBToIndex
* @brief generalized histograms up to 4 dimensions
*
* vtkImageQuantizeRGBToIndex takes a 3 component RGB image as
* input and produces a one component index image as output, along with
* a lookup table that contains the color definitions for the index values.
* This filter works on the entire input extent - it does not perform
* streaming, and it does not supported threaded execution (because it has
* to process the entire image).
*
* To use this filter, you typically set the number of colors
* (between 2 and 65536), execute it, and then retrieve the lookup table.
* The colors can then be using the lookup table and the image index.
*
* This filter can run faster, by initially sampling the colors at a
* coarser level. This can be specified by the SamplingRate parameter.
*
* The "index-image" viewed as a greyscale image, is usually quite
* arbitrary, accentuating contrast where none can be perceived in
* the original color image.
* To make the index image more meaningful (e.g. for image segmentation
* operating on scalar images), we sort the mean colors by luminance
* and re-map the indices accordingly. This option does not introduce any
* computational complexity and has no impact on actual colors in the
* lookup table (only their order).
*/
#ifndef vtkImageQuantizeRGBToIndex_h
#define vtkImageQuantizeRGBToIndex_h
#include "vtkImageAlgorithm.h"
#include "vtkImagingColorModule.h" // For export macro
VTK_ABI_NAMESPACE_BEGIN
class vtkLookupTable;
class VTKIMAGINGCOLOR_EXPORT vtkImageQuantizeRGBToIndex : public vtkImageAlgorithm
{
public:
static vtkImageQuantizeRGBToIndex* New();
vtkTypeMacro(vtkImageQuantizeRGBToIndex, vtkImageAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent) override;
///@{
/**
* Set / Get the number of color index values to produce - must be
* a number between 2 and 65536.
*/
vtkSetClampMacro(NumberOfColors, int, 2, 65536);
vtkGetMacro(NumberOfColors, int);
///@}
vtkSetVector3Macro(SamplingRate, int);
vtkGetVector3Macro(SamplingRate, int);
vtkSetMacro(SortIndexByLuminance, bool);
vtkGetMacro(SortIndexByLuminance, bool);
vtkBooleanMacro(SortIndexByLuminance, bool);
///@{
/**
* Get the resulting lookup table that contains the color definitions
* corresponding to the index values in the output image.
*/
vtkGetObjectMacro(LookupTable, vtkLookupTable);
///@}
vtkGetMacro(InitializeExecuteTime, double);
vtkGetMacro(BuildTreeExecuteTime, double);
vtkGetMacro(LookupIndexExecuteTime, double);
///@{
/**
* For internal use only - get the type of the image
*/
vtkGetMacro(InputType, int);
///@}
///@{
/**
* For internal use only - set the times for execution
*/
vtkSetMacro(InitializeExecuteTime, double);
vtkSetMacro(BuildTreeExecuteTime, double);
vtkSetMacro(LookupIndexExecuteTime, double);
///@}
protected:
vtkImageQuantizeRGBToIndex();
~vtkImageQuantizeRGBToIndex() override;
vtkLookupTable* LookupTable;
int NumberOfColors;
int InputType;
int SamplingRate[3];
bool SortIndexByLuminance;
double InitializeExecuteTime;
double BuildTreeExecuteTime;
double LookupIndexExecuteTime;
int RequestInformation(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;
int RequestUpdateExtent(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;
int RequestData(vtkInformation*, vtkInformationVector**, vtkInformationVector*) override;
private:
vtkImageQuantizeRGBToIndex(const vtkImageQuantizeRGBToIndex&) = delete;
void operator=(const vtkImageQuantizeRGBToIndex&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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