| hough_circle_trans | Returns the Hough-Transform for circles with a given radius. |
| hough_circles | Detects the centre of circles in regions with the help of the Hough transform for circles with a certain radius |
| hough_line_trans | Produces the Hough transform for lines within regions. |
| hough_lines | Detects lines in edge images with the help of the Hough transform and returns it in HNF |
| matching_lines | Selects those lines from a set of lines (in HNF) which fit best into a region. |
| point_in_line | Check whether a pixel belongs to a line. |