union1union1Union1Union1union1 (Operator)
Name
union1union1Union1Union1union1 — Return the union of all input regions.
Signature
def union1(region: HObject) -> HObject
Description
union1union1Union1Union1union1 computes the union of all input regions and
returns the result in RegionUnionRegionUnionRegionUnionregionUnionregion_union.
Execution Information
- Multithreading type: reentrant (runs in parallel with non-exclusive operators).
- Multithreading scope: global (may be called from any thread).
- Processed without parallelization.
Parameters
RegionRegionRegionregionregion (input_object) region-array → objectHRegionHObjectHObjectHobject
Regions of which the union is to be computed.
RegionUnionRegionUnionRegionUnionregionUnionregion_union (output_object) region → objectHRegionHObjectHObjectHobject *
Union of all input regions.
Number of elements:
RegionUnion <= Region
Example (HDevelop)
* Union of segmentation results:
threshold(Image,Region1,128,255)
dyn_threshold(Image,Mean,Region2,5,'light')
concat_obj(Region1,Region2,Regions)
union1(Regions,RegionUnion)
Example (C)
/* Union of segmentation results: */
threshold(Image,&Region1,128.0,255.0);
dyn_threshold(Image,Mean,&Region2,5.0,"light");
concat_obj(Region1,Region2,&Regions);
union1(Regions,&RegionUnion);
Example (HDevelop)
* Union of segmentation results:
threshold(Image,Region1,128,255)
dyn_threshold(Image,Mean,Region2,5,'light')
concat_obj(Region1,Region2,Regions)
union1(Regions,RegionUnion)
Example (HDevelop)
* Union of segmentation results:
threshold(Image,Region1,128,255)
dyn_threshold(Image,Mean,Region2,5,'light')
concat_obj(Region1,Region2,Regions)
union1(Regions,RegionUnion)
Complexity
Let F be the sum of all areas of the input regions. Then the
runtime complexity is O(log(sqrt(F)) * sqrt(F)).
Result
union1union1Union1Union1union1 always returns 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>)
and 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>).
If necessary, an exception is raised.
Possible Predecessors
thresholdthresholdThresholdThresholdthreshold,
connectionconnectionConnectionConnectionconnection,
regiongrowingregiongrowingRegiongrowingRegiongrowingregiongrowing,
pouringpouringPouringPouringpouring
Possible Successors
select_shapeselect_shapeSelectShapeSelectShapeselect_shape,
disp_regiondisp_regionDispRegionDispRegiondisp_region
Alternatives
union2union2Union2Union2union2
See also
intersectionintersectionIntersectionIntersectionintersection,
complementcomplementComplementComplementcomplement
Module
Foundation