/** 
* @file Centrist.h
* @brief Implementation of the Centrist feature published in  "CENTRIST: A Visual Descriptor for Scene Categorization" (PAMI 2011)
* @author Alexander Lütz
* @date 12/06/2011
*/
#ifndef CENTRISTINCLUDE
#define CENTRISTINCLUDE

#include "core/vector/VectorT.h"
#include "core/vector/MatrixT.h"
#include "core/image/ImageT.h"

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

namespace OBJREC {

/** interface to CENTRIST implementation*/
class Centrist : public LocalFeature
{

    protected:
		 int sizeNeighborhood;
		 
		 int CensusTransform(const NICE::Image & img, const int & x, const int & y);
		 int CensusTransform(const NICE::ColorImage & img, const int & x, const int & y, const int & channel);
		 void GenerateHistForOneRect(const NICE::Image & img, const int & xi, const int & xa, const int & yi, const int & ya, NICE::Vector & feature);
		 void GenerateHistForOneRect(const NICE::ColorImage & img, const int & xi, const int & xa, const int & yi, const int & ya, NICE::Vector & feature);
		 void computeDesc( const NICE::Image & img, NICE::VVector & positions, NICE::VVector & descriptors );
		 void computeDesc( const NICE::ColorImage & img, NICE::VVector & positions, NICE::VVector & descriptors );

    public:
  
	/** simple constructor */
	Centrist();
	/** default constructor */
	Centrist(const NICE::Config *conf, const std::string & section="CENTRIST");
      
	/** simple destructor */
	virtual ~Centrist();

	// we have 8 neighbors, so the size is always 256 with the given implementation (without spatial levels, ...)
	/** Beware: multiply this number by the number of channels you use in your color image*/
	int getDescSize(){return 256;};

	int getDescriptors ( const NICE::Image & img, NICE::VVector & positions, NICE::VVector & descriptors);
	
	int getDescriptors ( const NICE::ColorImage & img, NICE::VVector & positions, NICE::VVector & descriptors);
	
	void visualizeFeatures ( NICE::Image & mark,
				 const NICE::VVector & positions,
				 size_t color ) const;
    
};


} // namespace

#endif