void cvCalcBackProject(IplImage * image,CvArr * dst,CvHistogram * hist);
void cvCalcBackProjectPatch(IplImage * image,CvArr * dst,CvSize range,CvHistogram * hist,int method,double factor);
void cvCalcBackProject(IplImage * image,CvArr * dst,CvHistogram * hist);
void cvCalcBackProjectPatch(IplImage * image,CvArr * dst,CvSize range,CvHistogram * hist,int method,double factor);