CV_SEQ_CHAIN_CONTOUR  243 modules/imgproc/src/contours.cpp         scanner->seq_type1 = CV_SEQ_CHAIN_CONTOUR;
CV_SEQ_CHAIN_CONTOUR  270 modules/imgproc/src/contours.cpp         CV_SEQ_CHAIN_CONTOUR : CV_SEQ_POLYGON;
CV_SEQ_CHAIN_CONTOUR  273 modules/imgproc/src/contours.cpp         CV_SEQ_CHAIN_CONTOUR : CV_SEQ_POLYGON;