erosion_golay — Erode a region with an element from the Golay alphabet.
erosion_golay erodes a region with the selected element GolayElement from the Golay alphabet. The following structuring elements are available:
'l', 'm', 'd', 'c', 'e', 'i', 'f', 'f2', 'h', 'k'.
The rotation number Rotation determines which rotation of the element should be used, and whether the foreground (even) or background version (odd) of the selected element should be used. The Golay elements, together with all possible rotations, are described with the operator golay_elements. The operator works by shifting the structuring element over the region to be processed (Region). For all positions of the structuring element fully contained in the region, the corresponding reference point (relative to the structuring element) is added to the output region. This means that the intersection of all translations of the structuring element within the region is computed.
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.
Not all values of Rotation are valid for any Golay element. For some of the values of Rotation, the resulting regions are identical to the input regions.
Regions to be eroded.
Structuring element from the Golay alphabet.
Default value: 'h'
List of values: 'c', 'd', 'e', 'f', 'f2', 'h', 'i', 'k', 'l', 'm'
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 (lin)
Minimum increment: 1
Recommended increment: 1
Rotation of the Golay element. Depending on the element, not all rotations are valid.
Default value: 0
List of values: 0, 2, 4, 6, 8, 10, 12, 14, 1, 3, 5, 7, 9, 11, 13, 15
Let F be the area of an input region. Then the runtime complexity for one region is:
O(3 * sqrt(F)) .
erosion_golay returns 2 (H_MSG_TRUE) if all parameters are correct. The behavior in case of empty or no input region can be set via:
no region: set_system('no_object_result',<RegionResult>)
empty region: empty region: set_system('empty_region_result',<RegionResult>)
Otherwise, an exception is raised.
threshold, regiongrowing, watersheds, class_ndim_norm
reduce_domain, select_shape, area_center, connection
erosion_seq, erosion1, erosion2
dilation_golay, opening_golay, closing_golay, hit_or_miss_golay, thinning_golay, thickening_golay, golay_elements