/** 
* @file LFReadCache.h
* @brief read local features from file
* @author Erik Rodner
* @date 02/14/2008

*/
#ifndef LFReadCacheINCLUDE
#define LFReadCacheINCLUDE

#include "core/vector/VectorT.h"
#include "core/vector/MatrixT.h"
#include "core/image/ImageT.h"
 
#include "LocalFeatureRepresentation.h"
#include "LFSiftPP.h"
#include "core/basics/Config.h"


namespace OBJREC {

/** read local features from file */
class LFReadCache : public LocalFeatureRepresentation
{

    protected:
		int   numFeatures;
		const LocalFeatureRepresentation *lfrep;
		std::string cachedir;

		int descFormat;
		int cachemode;

		template <class ImageClass>
		int extractFeaturesTemplate ( const ImageClass & img, 
				  NICE::VVector & features, 
				  NICE::VVector & positions) const;

    public:
  
	/** constructor 
	 * @param conf Configuration
	 * @param lfrep a LocalFeatureRepresentation (i.e. LFColorSande)
	 * @param _numfeatures how many features should be returned (-1 for all)
	 */
	LFReadCache( const NICE::Config *conf, 
		     const LocalFeatureRepresentation *lfrep,
		     int _numFeatures = -1 );
      
	/** simple destructor */
	virtual ~LFReadCache();

	int getDescSize () const;

	/**
	 * extract features for gray images
	 * @param img input image
	 * @param features output features
	 * @param positions position of the features
	 * @return 
	 */
	int extractFeatures ( const NICE::Image & img, 
			      NICE::VVector & features, 
			      NICE::VVector & positions ) const;
	
	/**
	 * extract features for color images
	 * @param img input image
	 * @param features output features
	 * @param positions position of the features
	 * @return 
	 */
	int extractFeatures ( const NICE::ColorImage & img, 
			      NICE::VVector & features, 
			      NICE::VVector & positions ) const;

	void visualize ( NICE::Image & img, 
		 const NICE::Vector & feature ) const;

	void visualizeFeatures ( NICE::Image & mark,
				 const NICE::VVector & positions,
				 size_t color ) const;
};

} // namespace

#include "LFReadCache.tcc"


#endif