Erode a region sequentially.
::erosion_seq computes the sequential erosion of the input region Region with the selected structuring element GolayElement from the Golay alphabet. This is done by executing the operator ::erosion_golay with all rotations of the structuring element Iterations times. The following structuring elements can be selected:
'l', 'd', 'c', 'f', 'h', 'k'.
Only the ``foreground elements'' (even rotation numbers) are used. The elements 'i' and 'e' result in unchanged output regions. The elements 'l', 'm' and 'f2' are identical for the foreground. The Golay elements, together with all possible rotations, are described with the operator ::golay_elements.
|
Region (input_object) |
region(-array) -> Hobject: HRegion(Array) |
| Regions to be eroded. | |
|
RegionErosion (output_object) |
region(-array) -> Hobject * : HRegion(Array) |
| Eroded regions. | |
|
GolayElement (input_control) |
string -> HTuple.char * |
| Structuring element from the Golay alphabet. | |
| Default value: 'h' | |
| List of values: 'l', 'd', 'c', 'f', 'h', 'k' | |
|
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 F be the area of an input region. Then the runtime complexity for one region is:
O(Iterations * 20 * sqrt(F)) .
::erosion_seq 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
::connection, ::reduce_domain, ::select_shape, ::area_center
::erosion_golay, ::erosion1, ::erosion2
::dilation_seq, ::hit_or_miss_seq, ::thinning_seq
Morphology
