Erode a region (using a reference point).
::erosion2 erodes the input regions with a structuring element (StructElement) having the reference point (Row,Column). ::erosion2 has a similar effect as ::erosion1, 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) -> Hobject: HRegion(Array) |
| Regions to be eroded. | |
|
StructElement (input_object) |
region -> Hobject: HRegion |
| Structuring element. | |
|
RegionErosion (output_object) |
region(-array) -> Hobject * : HRegion(Array) |
| Eroded regions. | |
|
Row (input_control) |
point.y -> HTuple.long |
| Row coordinate of the reference point. | |
| Default value: 0 | |
| Typical range of values: 0 <= Row <= 511 (lin) | |
| Minimum increment: 1 | |
|
Recommended increment: 1 | |
|
Column (input_control) |
point.x -> HTuple.long |
| Column coordinate of the reference point. | |
| Default value: 0 | |
| Typical range of values: 0 <= Column <= 511 (lin) | |
| Minimum increment: 1 | |
|
Recommended increment: 1 | |
|
Iterations (input_control) |
integer -> HTuple.long |
| 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) .
::erosion2 returns 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.
::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_sub2, ::minkowski_sub1, ::erosion1, ::erosion_golay, ::erosion_seq
::transpose_region, ::gen_circle, ::gen_rectangle2, ::gen_region_polygon
Morphology
