Maximum distance between two contour points.
The operator diameter_xld calculates the maximum distance between two contour points. The coordinates of these two extremes and the distance between them will be returned. The input contour must not intersect itself, otherwise the resulting parameters are not meaningful. If the input contour is not closed it will be closed automatically.
If the contour is empty, the results of Row1, Column1, Row2 and Column2 (all of them = 0) may lead to confusion.
|
XLD (input_object) |
xld(-array) -> object |
| Contour(s) to be examined. | |
|
Row1 (output_control) |
line.begin.y(-array) -> real |
| Row coordinate of the first extreme point of the contour(s). | |
|
Column1 (output_control) |
line.begin.x(-array) -> real |
| Column coordinate of the first extreme point of the contour(s). | |
|
Row2 (output_control) |
line.end.y(-array) -> real |
| Row coordinate of the second extreme point of the contour(s). | |
|
Column2 (output_control) |
line.end.x(-array) -> real |
| Column coordinate of the second extreme point of the contour(s). | |
|
Diameter (output_control) |
number(-array) -> real |
| Distance of the two extreme points of the contour(s). | |
The operator diameter_xld returns the value 2 (H_MSG_TRUE), if the input is not empty. The reaction to empty input (no input contours are available) may be determined with the help of the operator set_system('no_object_result',<Result>). If necessary an exception is raised.
diameter_xld is reentrant and automatically parallelized (on tuple level).
gen_contours_skeleton_xld, edges_sub_pix, threshold_sub_pix, gen_contour_polygon_xld
Sub-pixel operators
