- The operator orientation_region calculates the orientation of the region. The operator is based on elliptic_axis. In addition the point on the contour with maximal distance to the center of gravity is calculated. If the column coordinate of this point is less than the column coordinate of the center of gravity the value of Pi is added to the angle.
- If more than one region is passed the results are stored in tuples, the index of a value in the tuple corresponding to the index of a region in the input.