junc ( Region : EndPoints, JuncPoints : : )

Find junctions and end points in a skeleton.

junc detects junctions and end points in a skeleton (see skeleton). The junctions in the input region Region are output as a region in JuncPoints, while the end points are output as a region in EndPoints.


Parameters

Region (input_object)
region(-array) -> object
Input skeletons.

EndPoints (output_object)
region(-array) -> object
Extracted end points.
Number of elements: EndPoints == Region

JuncPoints (output_object)
region(-array) -> object
Extracted junctions.
Number of elements: JuncPoints == Region


Example
/* non-connected branches of a skeleton */
skeleton(Region:Skeleton::) >
junc(Skeleton:EPoints,JPoints::) >
difference(S,JPoints:Rows::) >
set_system('heighbourhood',4) >
connection(Rows:Parts::) >

Complexity

Let F be the area of the input region. Then the runtime complexity is O(F).


Result

junc always returns the value TRUE. The behavior in case of empty input (no regions given) can be set via set_system(::'no_object_result',<Result>:), the behavior in case of an empty input region via set_system(::'empty_region_result',<Result>:), and the behavior in case of an empty result region via set_system(::'store_empty_region',<true/false>:). If necessary, an exception is raised.


Possible Predecessors

skeleton


Possible Successors

area_center, connection, fetch_coord, difference


See also

pruning, split_skeleton1



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