OpenCV- Working with OpenCV

Alot of feature detectors such as the Haar classifier will return rectangular shapes presented as a detected feature. one of the things to do in order to track these, is to find the center of the rectangle.   int main( int argc, char** argv ) { atscameraCapture movie; char code = (char)-1; for(;;)         {             //get camera             cv::Mat imgs = movie.ats_getImage(); #define drawCross( center, color, d, img )                                 \             line( img, Point( center.x - d, center.y - d ),                \       ...