CV_IS_SEQ_CHAIN_CONTOUR   74 modules/imgproc/src/approx.cpp     CV_Assert( CV_IS_SEQ_CHAIN_CONTOUR( chain ));
CV_IS_SEQ_CHAIN_CONTOUR 2410 modules/imgproc/src/drawing.cpp         if( CV_IS_SEQ_CHAIN_CONTOUR( contour ))