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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: LabelToRGBAFilter.h,v $
Language: C++
Date: $Date: 2009/10/26 16:22:52 $
Version: $Revision: 1.2 $
Copyright (c) 2003 Insight Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/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 notices for more information.
=========================================================================*/
#ifndef __LabelToRGBAFilter_h_
#define __LabelToRGBAFilter_h_
#include "SNAPCommon.h"
#include "itkImage.h"
#include "itkRGBAPixel.h"
#include "itkImageToImageFilter.h"
#include "ColorLabelTable.h"
#include <itkRGBAPixel.h>
#include <itkNumericTraitsRGBAPixel.h>
/**
* \class LabelToRGBAFilter
* \brief Simple filter that maps label image to RGB color image
*/
class LabelToRGBAFilter:
public itk::ImageToImageFilter<
itk::Image<LabelType, 2> , itk::Image<itk::RGBAPixel<unsigned char>,2> >
{
public:
/** Pixel Type of the input image */
typedef LabelType InputPixelType;
typedef itk::Image<InputPixelType, 2> InputImageType;
typedef itk::SmartPointer<InputImageType> InputImagePointer;
/** Pixel Type of the output image */
typedef itk::RGBAPixel<unsigned char> OutputPixelType;
typedef itk::Image<OutputPixelType, 2> OutputImageType;
typedef itk::SmartPointer<OutputImageType> OutputImagePointer;
/** Standard class typedefs. */
typedef LabelToRGBAFilter Self;
typedef itk::ImageToImageFilter<InputImageType,OutputImageType> Superclass;
typedef itk::SmartPointer<Self> Pointer;
typedef itk::SmartPointer<const Self> ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self)
/** Image dimension. */
itkStaticConstMacro(ImageDimension, unsigned int,
InputImageType::ImageDimension);
/** Set color table macro */
void SetColorTable(ColorLabelTable *table)
{
m_ColorTable = table;
this->SetNthInput(1, table);
}
/** Get color table */
ColorLabelTable *GetColorTable()
{
return m_ColorTable;
}
protected:
void PrintSelf(std::ostream& os, itk::Indent indent) const
{ os << indent << "LabelToRGBAFilter"; }
/** Generate Data */
void GenerateData( void )
{
// Here's the input and output
InputImageType::ConstPointer inputPtr = this->GetInput();
OutputImageType::Pointer outputPtr = this->GetOutput();
// Get the number of pixels in the input
size_t n = inputPtr->GetBufferedRegion().GetNumberOfPixels();
// Allocate output if needed
if(outputPtr->GetBufferedRegion().GetNumberOfPixels() != n)
{
outputPtr->SetBufferedRegion(inputPtr->GetBufferedRegion());
outputPtr->Allocate();
}
// Get the clear label
const ColorLabel &clear = m_ColorTable->GetColorLabel(0);
const ColorLabel *cllast = &clear;
// Keep track of the last pixel - this reduces the amount of color label
// lookups, taking advantage of the fact that segmentations are homogeneous
InputPixelType last_pixel = 0;
// Simple loop
const LabelType *xin = inputPtr->GetBufferPointer(), *xinend = xin + n;
OutputPixelType *xout = outputPtr->GetBufferPointer();
for(; xin < xinend; ++xin, ++xout)
{
if(*xin != last_pixel)
{
last_pixel = *xin;
const ColorLabel &cl = m_ColorTable->GetColorLabel(last_pixel);
if(cl.IsVisible())
cllast = &cl;
else
cllast = &clear;
}
cllast->GetRGBAVector(xout->GetDataPointer());
}
}
private:
ColorLabelTable *m_ColorTable;
};
#endif
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