first try of gist.

reco_sym.cpp

// this is just a test
for( size_t i = 0; i < contours.size(); i++ ) {
    approxPolyDP( Mat(contours[i]), contours_poly[i], 3, true );
    boundRect[i] = boundingRect( Mat(contours_poly[i]) );
    minEnclosingCircle( contours_poly[i], center[i], radius[i] );
 }