NICE_VisLearning/features/localfeatures/LocalFeatureOpponnentSift.cpp

#include <iostream>

#include "vislearning/features/localfeatures/sift.h"
#include "vislearning/features/localfeatures/LocalFeatureOpponnentSift.h"

using namespace OBJREC;
using namespace std;
using namespace NICE;

LocalFeatureOpponnentSift::LocalFeatureOpponnentSift( const Config *conf ):LocalFeatureRGBSift(conf)
{
}

LocalFeatureOpponnentSift::~LocalFeatureOpponnentSift()
{
}

int LocalFeatureOpponnentSift::getDescriptors ( const NICE::ColorImage & cimg, 
		VVector & positions,
  VVector & descriptors ) const
{
	NICE::ColorImage opimg(cimg.width(), cimg.height());
	
	for(int y = 0; y < (int)cimg.height(); y++)
	{
		for(int x = 0; x < (int)cimg.width(); x++)
		{
			// Farbkanaele auslesen
			int r = cimg.getPixel(x,y,0);
			int g = cimg.getPixel(x,y,1);
			int b = cimg.getPixel(x,y,2);
			
			// Transformation in den Opponent Farbraum nach Van de Sande
			int o1 = (int)(((double)(r-g)+255.0)/2.0);
			int o2 = (int)(((double)(r+g-b)+510.0)/4.0);
			int o3 = (int)((double)(r+g+b)/3.0);

			opimg.setPixel(x,y,o1,o2,o3);
		}
	}
	
	return LocalFeatureRGBSift::getDescriptors(opimg, positions, descriptors);
}