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vtkImageRGBToYIQ.cxx
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vtkImageRGBToYIQ.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImageRGBToYIQ.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 "vtkImageRGBToYIQ.h"
#include "vtkImageData.h"
#include "vtkImageProgressIterator.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
vtkStandardNewMacro(vtkImageRGBToYIQ);
//----------------------------------------------------------------------------
vtkImageRGBToYIQ::vtkImageRGBToYIQ()
{
this->Maximum = 255.0;
this->SetNumberOfInputPorts(1);
this->SetNumberOfOutputPorts(1);
}
//----------------------------------------------------------------------------
// This templated function executes the filter for any type of data.
namespace{
template <class T>
void vtkImageRGBToYIQExecute(vtkImageRGBToYIQ *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, Y, I, Q;
double max = self->GetMaximum();
// 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) / max; inSI++;
G = static_cast<double>(*inSI) / max; inSI++;
B = static_cast<double>(*inSI) / max; inSI++;
//vtkMath::RGBToHSV(R, G, B, &H, &S, &V);
// Port this snippet below into vtkMath as RGBtoYIQ(similar to RGBToHSV above)
// The numbers used below are standard numbers used from here
// https://www.eembc.org/techlit/datasheets/yiq_consumer.pdf
// Please do not change these numbers
Y = 0.299*R + 0.587*G + 0.114*B;
I = 0.596*R - 0.275*G - 0.321*B;
Q = 0.212*R - 0.523*G + 0.311*B;
//----------------------------------------------------------------
Y *= max;
I *= max;
Q *= max;
if (Y > max)
{
Y = max;
}
if (I > max)
{
I = max;
}
if (Q > max)
{
Q = max;
}
// assign output.
*outSI = static_cast<T>(Y); outSI++;
*outSI = static_cast<T>(I); outSI++;
*outSI = static_cast<T>(Q); outSI++;
for (idxC = 3; idxC <= maxC; idxC++)
{
*outSI++ = *inSI++;
}
}
inIt.NextSpan();
outIt.NextSpan();
}
}
}
//----------------------------------------------------------------------------
void vtkImageRGBToYIQ::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(
vtkImageRGBToYIQExecute( this, inData,
outData, outExt, id,
static_cast<VTK_TT *>(nullptr)));
default:
vtkErrorMacro(<< "Execute: Unknown ScalarType");
return;
}
}
void vtkImageRGBToYIQ::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Maximum: " << this->Maximum << "\n";
}