connection — Compute connected components of a region.
connection determines the connected components of the input regions given in Region. The neighborhood used for this can be set via set_system('neighborhood',<4/8>). The default is 8-neighborhood, which is useful for determining the connected components of the foreground. The maximum number of connected components that is returned by connection can be set via set_system('max_connection',<Num>). The default value of 0 causes all connected components to be returned. The inverse operator of connection is union1.
read_image(Image,'monkey') set_colored(WindowHandle,12) threshold(Image,Light,150.0,255.0) count_obj(Light,Number1) fwrite_string(FH, 'Number of regions after threshold = '+Number1) fnew_line(FH) disp_region(Light,WindowHandle) connection(Light,Many) count_obj(Many,Number2) fwrite_string(FH, 'Number of regions after threshold = '+Number2) fnew_line(FH) disp_region(Many,WindowHandle)
Let F be the area of the input region and N be the number of generated connected components. Then the runtime complexity is O(sqrt(F) * sqrt(N)).
connection always returns the value 2 (H_MSG_TRUE). The behavior in case of empty input (no regions given) can be set via set_system('no_object_result',<Result>) and the behavior in case of an empty input region via set_system('empty_region_result',<Result>). If necessary, an exception is raised.
auto_threshold, threshold, dyn_threshold, erosion1
select_shape, select_gray, shape_trans, set_colored, dilation1, count_obj, reduce_domain, add_channels