函数说明： Parameters: imgProb windowIn numIters windowOut CAMSHIFT window - 2D object probability distribution - CvRect of CAMSHIFT Window intial size - If CAMSHIFT iterates this many times, stop - Location, height and width of converged len width itersUsed - If != NULL, return equivalent len - If != NULL, return equivalent width - Returns number of iterations CAMSHIFT took to converge Returns: The function itself returns the area found int cvMeanShift( const void* imgProb, CvRect windowIn, CvTermCriteria criteria, CvConnectedComp* comp ) { i = 0, eps; CvMoments moments; int CvMat CvMat CvRect cur_rect = windowIn; stub, *mat = (CvMat*)imgProb; cur_win; CV_FUNCNAME( "cvMeanShift" ); if( comp ) comp->rect = windowIn; moments.m00 = moments.m10 = moments.m01 = 0; __BEGIN__; CV_CALL( mat = cvGetMat( mat, &stub )); if( windowIn.height <= 0 || windowIn.width <= 0 ) CV_ERROR( CV_StsBadArg, "Input window has non-positive sizes" ); if( windowIn.x < 0 || windowIn.x + windowIn.width > mat->cols || windowIn.y < 0 || windowIn.y + windowIn.height > mat->rows ) CV_ERROR( CV_StsBadArg, "Initial window is not inside the image ROI" ); 

CV_CALL( criteria = cvCheckTermCriteria( criteria, 1., 100 )); eps = cvRound( criteria.epsilon * criteria.epsilon ); for( i = 0; i < criteria.max_iter; i++ ) { int dx, dy, nx, ny; double inv_m00; CV_CALL( cvGetSubRect( mat, &cur_win, cur_rect )); CV_CALL( cvMoments( &cur_win, &moments )); if( fabs(moments.m00) < DBL_EPSILON ) break; inv_m00 = moments.inv_sqrt_m00*moments.inv_sqrt_m00; dx = cvRound( moments.m10 * inv_m00 - windowIn.width*0.5 ); dy = cvRound( moments.m01 * inv_m00 - windowIn.height*0.5 ); nx = cur_rect.x + dx; ny = cur_rect.y + dy; if( nx < 0 ) nx = 0; else if( nx + cur_rect.width > mat->cols ) nx = mat->cols - cur_rect.width; if( ny < 0 ) ny = 0; else if( ny + cur_rect.height > mat->rows ) ny = mat->rows - cur_rect.height; dx = nx - cur_rect.x; dy = ny - cur_rect.y; cur_rect.x = nx; cur_rect.y = ny; if( dx*dx + dy*dy < eps ) break; } 

__END__; if( comp ) { comp->rect = cur_rect; comp->area = (float)moments.m00; } return i; }