READ_PT           542 modules/imgproc/src/approx.cpp             READ_PT(start_pt, pos);
READ_PT           548 modules/imgproc/src/approx.cpp                 READ_PT(pt, pos);
READ_PT           583 modules/imgproc/src/approx.cpp         READ_PT(start_pt, pos);
READ_PT           596 modules/imgproc/src/approx.cpp                 READ_PT(pt, pos);