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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImageRGBToHSI.cxx
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.
=========================================================================*/
#include "vtkImageRGBToHSI.h"
#include "vtkMath.h"
#include "vtkImageData.h"
#include "vtkImageProgressIterator.h"
#include "vtkObjectFactory.h"
#include <math.h>
vtkStandardNewMacro(vtkImageRGBToHSI);
//----------------------------------------------------------------------------
vtkImageRGBToHSI::vtkImageRGBToHSI()
{
this->Maximum = 255.0;
this->SetNumberOfInputPorts(1);
this->SetNumberOfOutputPorts(1);
}
//----------------------------------------------------------------------------
// This templated function executes the filter for any type of data.
template <class T>
void vtkImageRGBToHSIExecute(vtkImageRGBToHSI *self,
vtkImageData *inData,
vtkImageData *outData,
int outExt[6], int id, T *)
{
vtkImageIterator<T> inIt(inData, outExt);
vtkImageProgressIterator<T> outIt(outData, outExt, self, id);
int idxC, maxC;
double R, G, B, H, S, I;
double max = self->GetMaximum();
double temp;
// find the region to loop over
maxC = inData->GetNumberOfScalarComponents()-1;
// Loop through output pixels
while (!outIt.IsAtEnd())
{
T* inSI = inIt.BeginSpan();
T* outSI = outIt.BeginSpan();
T* outSIEnd = outIt.EndSpan();
while (outSI != outSIEnd)
{
// Pixel operation
R = static_cast<double>(*inSI); inSI++;
G = static_cast<double>(*inSI); inSI++;
B = static_cast<double>(*inSI); inSI++;
// Saturation
temp = R;
if (G < temp)
{
temp = G;
}
if (B < temp)
{
temp = B;
}
double sumRGB = R+G+B;
if(sumRGB == 0.0)
{
S = 0.0;
}
else
{
S = max * (1.0 - (3.0 * temp / sumRGB));
}
temp = static_cast<double>(R + G + B);
// Intensity is easy
I = temp / 3.0;
// Hue
temp = sqrt((R-G)*(R-G) + (R-B)*(G-B));
if(temp != 0.0)
{
temp = acos((0.5 * ((R-G) + (R-B))) / temp);
}
if (G >= B)
{
H = max * (temp / (2.0 * vtkMath::Pi()));
}
else
{
H = max * (1.0 - (temp / (2.0 * vtkMath::Pi())));
}
// assign output.
*outSI = static_cast<T>(H); outSI++;
*outSI = static_cast<T>(S); outSI++;
*outSI = static_cast<T>(I); outSI++;
for (idxC = 3; idxC <= maxC; idxC++)
{
*outSI++ = *inSI++;
}
}
inIt.NextSpan();
outIt.NextSpan();
}
}
//----------------------------------------------------------------------------
void vtkImageRGBToHSI::ThreadedExecute (vtkImageData *inData,
vtkImageData *outData,
int outExt[6], int id)
{
vtkDebugMacro(<< "Execute: inData = " << inData
<< ", outData = " << outData);
// this filter expects that input is the same type as output.
if (inData->GetScalarType() != outData->GetScalarType())
{
vtkErrorMacro(<< "Execute: input ScalarType, " << inData->GetScalarType()
<< ", must match out ScalarType " << outData->GetScalarType());
return;
}
// need three components for input and output
if (inData->GetNumberOfScalarComponents() < 3)
{
vtkErrorMacro("Input has too few components");
return;
}
if (outData->GetNumberOfScalarComponents() < 3)
{
vtkErrorMacro("Output has too few components");
return;
}
switch (inData->GetScalarType())
{
vtkTemplateMacro(
vtkImageRGBToHSIExecute( this, inData,
outData, outExt, id,
static_cast<VTK_TT *>(0)));
default:
vtkErrorMacro(<< "Execute: Unknown ScalarType");
return;
}
}
void vtkImageRGBToHSI::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Maximum: " << this->Maximum << "\n";
}
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