| Operators |
orientation_points_xld — Orientation of contours or polygons treated as point clouds.
The operator orientation_points_xld calculates the orientation of the point clouds given by the contours or polygons XLD (i.e., the order of the points in the contour or polygon is not taken into account). The orientation Phi is calculated the same way as in elliptic_axis_points_xld. If the contour or polygon is closed (end point = start point), the end point of the contour or polygon is not taken into account to avoid that it receives twice the weight of the other points.
In addition, the contour point p_{m} with maximum distance to the center of gravity c is calculated. If the angle between the vector and the vector given by Phi is greater than , the value of is added to the angle. If XLD consists of only two points, Phi is given by the direction from the first point towards the second point.
orientation_points_xld should be used if the contour XLD intersects itself or if it is not possible to close the contour using a line from end to start point without self-intersection, because in this case orientation_xld does not produce useful results. To test whether the contours or polygons intersect themselves, test_self_intersection_xld can be used.
If more than one contour or polygon is passed, the values of the orientations are stored in a tuple in the same order as the respective contours or polygons in XLD.
Contours or polygons to be examined.
Orientation of the contours or polygons (radians).
Assertion: - pi < Phi && Phi <= pi
gen_contours_skeleton_xld, edges_sub_pix, threshold_sub_pix, gen_contour_polygon_xld
orientation_xld, elliptic_axis_points_xld, smallest_rectangle2_xld
Foundation
| Operators |