imgfeatures.h

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#ifndef IMGFEATURES_H
#define IMGFEATURES_H

#include <cxcore.h> // opencv

enum feature_type
  {
    FEATURE_OXFD,
    FEATURE_LOWE,
  };

enum feature_match_type
  {
    FEATURE_FWD_MATCH,
    FEATURE_BCK_MATCH,
    FEATURE_MDL_MATCH,
  };


/* colors in which to display different feature types */
#define FEATURE_OXFD_COLOR CV_RGB(255,255,0)
#define FEATURE_LOWE_COLOR CV_RGB(255,0,255)

#define FEATURE_MAX_D 128


struct feature
{
  double x;                      
  double y;                      
  double a;                      
  double b;                      
  double c;                      
  double scl;                    
  double ori;                    
  int d;                         
  double descr[FEATURE_MAX_D];   
  int type;                      
  int klass;                     
  struct feature* fwd_match;     
  struct feature* bck_match;     
  struct feature* mdl_match;     
  CvPoint2D64f img_pt;           
  CvPoint2D64f mdl_pt;           
  void* feature_data;            
};


extern int import_features( char* filename, int type, struct feature** feat );


extern int export_features( char* filename, struct feature* feat, int n );


extern void draw_features( IplImage* img, struct feature* feat, int n );


extern double descr_dist_sq( struct feature* f1, struct feature* f2 );


#endif