split_skeleton_regionsplit_skeleton_regionSplitSkeletonRegionSplitSkeletonRegion (Operator)
Name
split_skeleton_regionsplit_skeleton_regionSplitSkeletonRegionSplitSkeletonRegion — Split lines represented by one pixel wide, non-branching regions.
Signature
Description
split_skeleton_regionsplit_skeleton_regionSplitSkeletonRegionSplitSkeletonRegionSplitSkeletonRegion splits lines represented by one pixel
wide, non-branching regions into shorter lines based on their
curvature. A line is split if the maximum distance of a point on
the line to the line segment connecting its end points is larger
than MaxDistanceMaxDistanceMaxDistanceMaxDistancemaxDistance (split & merge algorithm). However,
not the approximating lines are returned, but rather the original
lines split into several output regions.
Attention
The input regions must represent non-branching lines, that is single
branches of the skeleton.
Execution Information
- Multithreading type: reentrant (runs in parallel with non-exclusive operators).
- Multithreading scope: global (may be called from any thread).
- Automatically parallelized on tuple level.
Parameters
SkeletonRegionSkeletonRegionSkeletonRegionSkeletonRegionskeletonRegion (input_object) region(-array) → objectHRegionHRegionHobject
Input lines (represented by 1 pixel wide, non-branching
regions).
RegionLinesRegionLinesRegionLinesRegionLinesregionLines (output_object) region-array → objectHRegionHRegionHobject *
Split lines.
MaxDistanceMaxDistanceMaxDistanceMaxDistancemaxDistance (input_control) integer → HTupleHTupleHtuple (integer) (int / long) (Hlong) (Hlong)
Maximum distance of the line points to the line segment
connecting both end points.
Default value: 3
Suggested values: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Typical range of values: 1
≤
MaxDistance
MaxDistance
MaxDistance
MaxDistance
maxDistance
≤
500 (lin)
Minimum increment: 1
Recommended increment: 1
Example (HDevelop)
read_image(Image,'fabrik')
edges_image (Image, ImaAmp, ImaDir, 'lanser2', 0.5, 'nms', 8, 16)
threshold (ImaAmp, RawEdges, 8, 255)
skeleton (RawEdges, Skeleton)
junctions_skeleton (Skeleton, EndPoints, JuncPoints)
difference (Skeleton, JuncPoints, SkelWithoutJunc)
connection (SkelWithoutJunc, SingleBranches)
select_shape (SingleBranches, SelectedBranches, 'area', 'and', 16, 99999)
split_skeleton_region (SelectedBranches, Lines, 3)
Example (C)
read_image(&Image,"fabrik");
edges_image (Image, &ImaAmp, &ImaDir, "lanser2", 0.5, "nms", 8, 16);
threshold (ImaAmp, &RawEdges, 8, 255);
skeleton (RawEdges, &Skeleton);
junctions_skeleton (Skeleton, &EndPoints, &JuncPoints);
difference (Skeleton, JuncPoints, &SkelWithoutJunc);
connection (SkelWithoutJunc, &SingleBranches);
select_shape (SingleBranches, &SelectedBranches, "area", "and", 16, 99999);
split_skeleton_region (SelectedBranches, Lines, 3);
Example (HDevelop)
read_image(Image,'fabrik')
edges_image (Image, ImaAmp, ImaDir, 'lanser2', 0.5, 'nms', 8, 16)
threshold (ImaAmp, RawEdges, 8, 255)
skeleton (RawEdges, Skeleton)
junctions_skeleton (Skeleton, EndPoints, JuncPoints)
difference (Skeleton, JuncPoints, SkelWithoutJunc)
connection (SkelWithoutJunc, SingleBranches)
select_shape (SingleBranches, SelectedBranches, 'area', 'and', 16, 99999)
split_skeleton_region (SelectedBranches, Lines, 3)
Example (HDevelop)
read_image(Image,'fabrik')
edges_image (Image, ImaAmp, ImaDir, 'lanser2', 0.5, 'nms', 8, 16)
threshold (ImaAmp, RawEdges, 8, 255)
skeleton (RawEdges, Skeleton)
junctions_skeleton (Skeleton, EndPoints, JuncPoints)
difference (Skeleton, JuncPoints, SkelWithoutJunc)
connection (SkelWithoutJunc, SingleBranches)
select_shape (SingleBranches, SelectedBranches, 'area', 'and', 16, 99999)
split_skeleton_region (SelectedBranches, Lines, 3)
Example (HDevelop)
read_image(Image,'fabrik')
edges_image (Image, ImaAmp, ImaDir, 'lanser2', 0.5, 'nms', 8, 16)
threshold (ImaAmp, RawEdges, 8, 255)
skeleton (RawEdges, Skeleton)
junctions_skeleton (Skeleton, EndPoints, JuncPoints)
difference (Skeleton, JuncPoints, SkelWithoutJunc)
connection (SkelWithoutJunc, SingleBranches)
select_shape (SingleBranches, SelectedBranches, 'area', 'and', 16, 99999)
split_skeleton_region (SelectedBranches, Lines, 3)
Result
split_skeleton_regionsplit_skeleton_regionSplitSkeletonRegionSplitSkeletonRegionSplitSkeletonRegion 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>)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>),
the behavior in case of an empty input region via
set_system('empty_region_result',<Result>)set_system("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>),
and the behavior in case of an empty result region via
set_system('store_empty_region',<'true'/'false'>)set_system("store_empty_region",<"true"/"false">)SetSystem("store_empty_region",<"true"/"false">)SetSystem("store_empty_region",<"true"/"false">)SetSystem("store_empty_region",<"true"/"false">).
If necessary, an exception is raised.
Possible Predecessors
connectionconnectionConnectionConnectionConnection,
select_shapeselect_shapeSelectShapeSelectShapeSelectShape,
skeletonskeletonSkeletonSkeletonSkeleton,
junctions_skeletonjunctions_skeletonJunctionsSkeletonJunctionsSkeletonJunctionsSkeleton,
differencedifferenceDifferenceDifferenceDifference
Possible Successors
count_objcount_objCountObjCountObjCountObj,
select_shapeselect_shapeSelectShapeSelectShapeSelectShape,
select_objselect_objSelectObjSelectObjSelectObj,
area_centerarea_centerAreaCenterAreaCenterAreaCenter,
elliptic_axiselliptic_axisEllipticAxisEllipticAxisEllipticAxis,
smallest_rectangle2smallest_rectangle2SmallestRectangle2SmallestRectangle2SmallestRectangle2,
get_region_polygonget_region_polygonGetRegionPolygonGetRegionPolygonGetRegionPolygon,
get_region_contourget_region_contourGetRegionContourGetRegionContourGetRegionContour
See also
split_skeleton_linessplit_skeleton_linesSplitSkeletonLinesSplitSkeletonLinesSplitSkeletonLines,
get_region_polygonget_region_polygonGetRegionPolygonGetRegionPolygonGetRegionPolygon,
gen_polygons_xldgen_polygons_xldGenPolygonsXldGenPolygonsXldGenPolygonsXld
Module
Foundation