Centres of circles for a specific radius.
::hough_circle_trans detects the centres of circles in regions with the help of the Hough transform for circles with a specific radius.
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RegionIn (input_object) |
region -> Hobject: HRegion |
| Binary edge image in which the circles are to be detected. | |
|
RegionOut (output_object) |
region(-array) -> Hobject * : HRegion(Array) |
| Centres of those circles which are included in the edge image by Percent percent. | |
| Number of elements: RegionOut == ((Radius * Percent) * Mode) | |
|
Radius (input_control) |
integer(-array) -> HTuple.long |
| Radius of the circle to be searched in the image. | |
| Default value: 12 | |
| Typical range of values: 2 <= Radius <= 500 (lin) | |
| Minimum increment: 1 | |
|
Recommended increment: 1 | |
| Number of elements: (1 <= Radius) <= 500 | |
|
Percent (input_control) |
integer(-array) -> HTuple.long |
| Indicates the percentage (approximately) of the (ideal) circle which must be present in the edge image RegionIn. | |
| Default value: 60 | |
| Typical range of values: 10 <= Percent <= 100 (lin) | |
| Minimum increment: 1 | |
|
Recommended increment: 5 | |
| Number of elements: (1 <= Percent) <= 100 | |
|
Mode (input_control) |
integer(-array) -> HTuple.long |
|
The modus defines the position of the circle in question:
0 - the radius is equivalent to the outer border of the set pixels. 1 - the radius is equivalent to the centres of the circle lines´ pixels. 2 - both 0 and 1 (a little more fuzzy, but more reliable in contrast to circles set slightly differently, necessitates 50 more processing capacity compared to 0 or 1 alone). | |
| List of values: 0, 1, 2 | |
| Number of elements: (1 <= Mode) <= 3 | |
The operator ::hough_circles returns the value H_MSG_TRUE if the input is not empty. The behavior in case of empty input (no input regions available) is set via the operator ::set_system('no_object_result',<Result>), the behavior in case of empty region is set via ::set_system('empty_region_result',<Result>). If necessary an exception handling is raised.
Region processing
