| ::close_measure | Delete a measure object. |
| ::gen_measure_arc | Prepare the extraction of straight edges perpendicular to an annular arc. |
| ::gen_measure_rectangle2 | Prepare the extraction of straight edges perpendicular to a rectangle. |
| ::measure_pairs | Extract straight edge pairs perpendicular to a rectangle. |
| ::measure_pos | Extract straight edges perpendicular to a rectangle. |
| ::measure_projection | Extract a gray value profile perpendicular to a rectangle. |