| get_region_chain | Contour of an object as chain code. |
| get_region_contour | Access the contour of an object. |
| get_region_convex | Access convex hull as contour. |
| get_region_points | Access the pixels of a region. |
| get_region_polygon | Polygon approximation of a region. |
| get_region_runs | Access the runlength coding of a region. |