NICE_VisLearning/features/localfeatures/LFColorWeijer.h

/** 
 * @file LFColorWeijer.cpp
 * @brief implementation of the color features mentioned in van de Weijer, J. & Schmid, C. Applying Color Names to Image Description (2007)
 * @author Björn Fröhlich
 * @date 01/28/2010
 */
#ifndef LFColorWeijerINCLUDE
#define LFColorWeijerINCLUDE

#include <vislearning/nice.h>

#include "LocalFeature.h"
#include "core/basics/Config.h"


namespace OBJREC {

/** interface to ColorSande implementation */
class LFColorWeijer : public LocalFeature
{

    protected:
		//! enum for 11 main colors
		enum 
		{
			BLACK = 0,
			BLUE,
			BROWN,
			GREY,
			GREEN,
			ORANGE,
			PINK,
			PURPLE,
			RED,
			WHITE,
			YELLOW,
			LASTCOLOR
		};
		
		//! bins for L*, a* and b* chanel of L*a*b*
		int bin[3];

		//! upper limits for L*, a* and b* chanel of L*a*b*
		double maxv[3];
		
		//! lower limits for L*, a* and b* chanel of L*a*b*
		double minv[3];
		
		//! quantization interval for L*, a* and b* chanel of L*a*b* depending on bin, maxv and minv
		double interval[3];
		
		//! destination of the computed lookuptable
		std::string tfile;
		
		//! lookuptable for the probabilities (4d: colors, L-channel, a-channel, b-channel)
		std::vector<std::vector<std::vector<std::vector<double> > > > hist;
		
		//! configuration file
		const NICE::Config *conf;
		
    public:
  
		/** simple constructor */
		LFColorWeijer( const NICE::Config *c);
		  
		/** simple destructor */
		virtual ~LFColorWeijer();
		
		/**
		 * get the size of the descriptor
		 * @return size of descriptor
		 */
		int getDescSize () const;
		
		/**
		 * get the colorWeijer features
		 * @param img grayvalue input image
		 * @param features features (output)
		 * @param positions position of the features
		 * @return 
		 */
		int getDescriptors ( const NICE::Image & img, NICE::VVector & positions, NICE::VVector & features ) const;
		
		/**
		 * get the colorWeijer features
		 * @param img color input image
		 * @param features features (output)
		 * @param positions given positions of the features
		 * @return 
		 */
		int getDescriptors ( const NICE::ColorImage & img, NICE::VVector & positions, NICE::VVector & features ) const;
		
		/**
		 * visualize the features
		 * @param mark 
		 * @param positions 
		 * @param color 
		 */
		void visualizeFeatures ( NICE::Image & mark, const NICE::VVector & positions,	size_t color ) const;
		
		/**
		 * visualize the features
		 * @param mark 
		 * @param positions 
		 * @param color 
		 */
		void visualizeFeatures ( NICE::ColorImage & mark, const NICE::VVector & features, const NICE::VVector & position ) const;
		
		/**
		 * visualize the features
		 * @param cimg 
		 */
		void visualizeFeatures ( const NICE::ColorImage & cimg) const;
		
		/**
		 * visualize the features
		 * @param cimg 
		 * @param out
		 */
		void visualizeFeatures ( const NICE::ColorImage & cimg, NICE::ColorImage & out) const;
		
		/**
		 * save parameters
		 */
		void store();
		
		
		/**
		 * load parameters
		 */
		void restore();
		
		/**
		 * smooths the look up table
		 */
		void smooth();
		
		/**
		 * normalizes the sum of a 3d histogram to 1
		 * @param tab 3d histogram
		 */
		void normalize(std::vector<std::vector<std::vector<double> > > &tab);
		
		/**
		 * creates a new and empty table
		 * @return table of the size bin[0]xbin[1]xbin[2]
		 */
		std::vector<std::vector<std::vector<double > > > createTable();
		
		/**
		 * finds a colorname in a given string
		 * @param fn input string
		 * @return number of the color
		 */
		int findColor(std::string &fn);
		
		/**
		 * creates a new Histogram for input image depending on the image mask
		 * @param cimg input image
		 * @param hist histogram
		 * @param mask which pixel should be consider
		 */
		void createHist(const NICE::ColorImage &cimg, std::vector<std::vector<std::vector<double> > > &hist, NICE::Image &mask);
		
		/**
		 * train the lookuptable
		 */
		void train();
		
		
		/**
		 * add a 3d table to a 3d table elementwise
		 * @param dest destination table
		 * @param src source table
		 */
		void add(std::vector<std::vector<std::vector<double> > > &dest, std::vector<std::vector<std::vector<double> > > &src);
		
		/**
		 * transform each pixel of an image
		 * @param img input image
		 * @param feats feature vector for each pixel
		 */
		void getFeats(const NICE::ColorImage &img, std::vector<std::vector<std::vector<double> > > &feats);
};


} // namespace

#endif