Erode a region (using a reference point).
minkowski_sub2 computes the Minkowski subtraction of the input regions with a structuring element (StructElement) having the reference point (Row,Column). minkowski_sub2 has a similar effect as minkowski_sub1, the difference is that the reference point of the structuring element can be chosen arbitrarily. The parameter Iterations determines the number of iterations which are to be performed with the structuring element. The result of iteration n-1 is used as input for iteration n.
A maximum region is generated in case of an empty structuring element.
Structuring elements (StructElement) can be generated with operators such as gen_circle, gen_rectangle1, gen_rectangle2, gen_ellipse, draw_region, gen_region_polygon, gen_region_points, etc.
|
Region (input_object) |
region(-array) -> object |
| Regions to be eroded. | |
|
StructElement (input_object) |
region -> object |
| Structuring element. | |
|
RegionMinkSub (output_object) |
region(-array) -> object |
| Eroded regions. | |
|
Row (input_control) |
point.y -> integer |
| Row coordinate of the reference point. | |
| Default value: 0 | |
| Suggested values: 0, 10, 16, 32, 64, 100, 128 | |
| Typical range of values: 0 <= Row <= 511 (lin) | |
| Minimum increment: 1 | |
|
Recommended increment: 1 | |
|
Column (input_control) |
point.x -> integer |
| Column coordinate of the reference point. | |
| Default value: 0 | |
| Suggested values: 0, 10, 16, 32, 64, 100, 128 | |
| Typical range of values: 0 <= Column <= 511 (lin) | |
| Minimum increment: 1 | |
|
Recommended increment: 1 | |
|
Iterations (input_control) |
integer -> integer |
| Number of iterations. | |
| Default value: 1 | |
| Suggested values: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 17, 20, 30, 40, 50 | |
| Typical range of values: 1 <= Iterations | |
| Minimum increment: 1 | |
|
Recommended increment: 1 | |
Let F1 be the area of the input region, and F2 be the area of the structuring element. Then the runtime complexity for one region is:
O(sqrt(F1) * sqrt(F2) * Iterations) .
minkowski_sub2 returns 2 (H_MSG_TRUE) if all parameters are correct. The behavior in case of empty or no input region can be set via:
a) no region: set_system('no_object_result',<RegionResult>)
b) empty region: set_system('empty_region_result',<RegionResult>)
Otherwise, an exception is raised.
minkowski_sub2 is reentrant and automatically parallelized (on tuple level).
threshold, regiongrowing, watersheds, class_ndim_norm, gen_circle, gen_ellipse, gen_rectangle1, gen_rectangle2, draw_region, gen_region_points, gen_struct_elements, gen_region_polygon_filled
reduce_domain, select_shape, area_center, connection
minkowski_sub1, erosion1, erosion2, erosion_golay, erosion_seq
gen_circle, gen_rectangle2, gen_region_polygon
Morphology
