opening_seg — Separate overlapping regions.
The opening_seg operation is defined as a sequence of the following operators: erosion1, connection and dilation1 (see example). Only one iteration is done in erosion1 and dilation1.
opening_seg serves to separate overlapping regions whose area of overlap is smaller than StructElement. It should be noted that the resulting regions can overlap without actually merging (see expand_region). opening_seg uses the center of gravity as the reference point of the 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.
Regions to be opened.
Structuring element (position-invariant).
* Simulation of opening_seg * opening_seg(Region,StructElement,RegionOpening): erosion1(Region,StructElement,H1,1) connection(H1,H2) dilation1(H2,StructElement,RegionOpening,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:
opening_seg 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: set_system('empty_region_result',<RegionResult>)
Otherwise, an exception is raised.
threshold, regiongrowing, connection, union1, watersheds, class_ndim_norm, gen_circle, gen_ellipse, gen_rectangle1, gen_rectangle2, draw_region, gen_region_points, gen_struct_elements, gen_region_polygon_filled
expand_region, reduce_domain, select_shape, area_center, connection
erosion1, connection, dilation1