split_skeleton_linesT_split_skeleton_linesSplitSkeletonLinesSplitSkeletonLinessplit_skeleton_lines (Operator)
Name
split_skeleton_linesT_split_skeleton_linesSplitSkeletonLinesSplitSkeletonLinessplit_skeleton_lines — Split lines represented by one pixel wide, non-branching lines.
Signature
def split_skeleton_lines(skeleton_region: HObject, max_distance: int) -> Tuple[Sequence[int], Sequence[int], Sequence[int], Sequence[int]]
Description
split_skeleton_linessplit_skeleton_linesSplitSkeletonLinesSplitSkeletonLinessplit_skeleton_lines 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 MaxDistanceMaxDistanceMaxDistancemaxDistancemax_distance (split & merge algorithm). The start
and end points of the approximating line segments are returned in
BeginRowBeginRowBeginRowbeginRowbegin_row, BeginColBeginColBeginColbeginColbegin_col, EndRowEndRowEndRowendRowend_row, and
EndColEndColEndColendColend_col.
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
SkeletonRegionSkeletonRegionSkeletonRegionskeletonRegionskeleton_region (input_object) region-array → objectHRegionHObjectHObjectHobject
Input lines (represented by 1 pixel wide, non-branching
regions).
MaxDistanceMaxDistanceMaxDistancemaxDistancemax_distance (input_control) integer → HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)
Maximum distance of the line points to the line segment
connecting both end points.
Default:
3
Suggested values:
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Value range:
1
≤
MaxDistance
MaxDistance
MaxDistance
maxDistance
max_distance
≤
500 (lin)
Minimum increment:
1
Recommended increment:
1
BeginRowBeginRowBeginRowbeginRowbegin_row (output_control) line.begin.y-array → HTupleSequence[int]HTupleHtuple (integer) (int / long) (Hlong) (Hlong)
Row coordinates of the start points of the
output lines.
BeginColBeginColBeginColbeginColbegin_col (output_control) line.begin.x-array → HTupleSequence[int]HTupleHtuple (integer) (int / long) (Hlong) (Hlong)
Column coordinates of the start points of the
output lines.
EndRowEndRowEndRowendRowend_row (output_control) line.end.y-array → HTupleSequence[int]HTupleHtuple (integer) (int / long) (Hlong) (Hlong)
Row coordinates of the end points of the
output lines.
EndColEndColEndColendColend_col (output_control) line.end.x-array → HTupleSequence[int]HTupleHtuple (integer) (int / long) (Hlong) (Hlong)
Column coordinates of the end points of the
output lines.
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_lines (SelectedBranches, 3, BeginRow, BeginCol, EndRow, \
EndCol)
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_lines (SelectedBranches, 3, &BeginRow, &BeginCol, &EndRow,
&EndCol);
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_lines (SelectedBranches, 3, BeginRow, BeginCol, EndRow, \
EndCol)
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_lines (SelectedBranches, 3, BeginRow, BeginCol, EndRow, \
EndCol)
Result
split_skeleton_linessplit_skeleton_linesSplitSkeletonLinesSplitSkeletonLinessplit_skeleton_lines 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>)set_system("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>)set_system("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">)set_system("store_empty_region",<"true"/"false">).
If necessary, an exception is raised.
Possible Predecessors
connectionconnectionConnectionConnectionconnection,
select_shapeselect_shapeSelectShapeSelectShapeselect_shape,
skeletonskeletonSkeletonSkeletonskeleton,
junctions_skeletonjunctions_skeletonJunctionsSkeletonJunctionsSkeletonjunctions_skeleton,
differencedifferenceDifferenceDifferencedifference
Possible Successors
select_linesselect_linesSelectLinesSelectLinesselect_lines,
partition_linespartition_linesPartitionLinesPartitionLinespartition_lines,
disp_linedisp_lineDispLineDispLinedisp_line
See also
split_skeleton_regionsplit_skeleton_regionSplitSkeletonRegionSplitSkeletonRegionsplit_skeleton_region,
detect_edge_segmentsdetect_edge_segmentsDetectEdgeSegmentsDetectEdgeSegmentsdetect_edge_segments
Module
Foundation