boundary boundary Boundary Boundary boundary (Operator)
Name
boundary boundary Boundary Boundary boundary
— Reduce a region to its boundary.
Signature
Description
boundary boundary Boundary Boundary Boundary boundary
computes the boundary of each input region in
Region Region Region Region region region
and returns them in RegionBorder RegionBorder RegionBorder RegionBorder regionBorder region_border
.
The parameter BoundaryType BoundaryType BoundaryType BoundaryType boundaryType boundary_type
determines the type of boundary
computation.
The contour computation is done using morphological operations.
The resulting output regions consist only of the minimal border of the input
regions. Their positions depend on the value of BoundaryType BoundaryType BoundaryType BoundaryType boundaryType boundary_type
,
accepting the following values:
'inner' "inner" "inner" "inner" "inner" "inner" : The contour lies within the original region.
'inner_filled' "inner_filled" "inner_filled" "inner_filled" "inner_filled" "inner_filled" : The contour lies within the original
region, holes in the interior of the input region are suppressed.
Due to algorithm optimization this contours may slightly differ
from corresponding ones obtained with 'inner' "inner" "inner" "inner" "inner" "inner" .
'outer' "outer" "outer" "outer" "outer" "outer" : The contour is one pixel outside of the original
region.
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
Region Region Region Region region region
(input_object) region(-array) →
object HRegion HObject HRegion Hobject
Regions for which the boundary is to be computed.
RegionBorder RegionBorder RegionBorder RegionBorder regionBorder region_border
(output_object) region(-array) →
object HRegion HObject HRegion Hobject *
Resulting boundaries.
BoundaryType BoundaryType BoundaryType BoundaryType boundaryType boundary_type
(input_control) string →
HTuple str HTuple Htuple (string) (string ) (HString ) (char* )
Boundary type.
Default value:
'inner'
"inner"
"inner"
"inner"
"inner"
"inner"
List of values: 'inner' "inner" "inner" "inner" "inner" "inner" , 'inner_filled' "inner_filled" "inner_filled" "inner_filled" "inner_filled" "inner_filled" , 'outer' "outer" "outer" "outer" "outer" "outer"
Example (C++)
#include "HalconCpp.h"
using namespace Halcon;
main()
{
HWindow w;
HRegion circ1 = HRegion::GenCircle (20, 10, 10.5);
circ1.Display (w);
w.Click ();
HRegion marg1 = circ1.Boundary ("inner");
w.SetColor ("red");
marg1.Display (w);
w.Click ();
return(0);
}
Example (C)
/* Intersections of two circles: */
gen_circle(&Circle1,200.0,100.0,100.5);
gen_circle(&Circle2,200.0,150.0,100.5);
boundary(Circle1,&Margin1,"inner");
boundary(Circle2,&Margin2,"inner");
intersection(Margin1,Margin2,&Intersections);
connection(Intersections,&Single);
T_area_center(Single,NULL,&Rows,&Columns);
/* simulation of Mode 'inner' */
void inner(Hobject Region, Hobject *Border)
{
Hobject Smaller;
erosion_circle(Region,&Smaller,1.5);
difference(Region,Smaller,Border);
}
Example (C++)
#include "HalconCpp.h"
using namespace Halcon;
main()
{
HWindow w;
HRegion circ1 = HRegion::GenCircle (20, 10, 10.5);
circ1.Display (w);
w.Click ();
HRegion marg1 = circ1.Boundary ("inner");
w.SetColor ("red");
marg1.Display (w);
w.Click ();
return(0);
}
Example (C++)
#include "HalconCpp.h"
using namespace Halcon;
main()
{
HWindow w;
HRegion circ1 = HRegion::GenCircle (20, 10, 10.5);
circ1.Display (w);
w.Click ();
HRegion marg1 = circ1.Boundary ("inner");
w.SetColor ("red");
marg1.Display (w);
w.Click ();
return(0);
}
Example (C++)
#include "HalconCpp.h"
using namespace Halcon;
main()
{
HWindow w;
HRegion circ1 = HRegion::GenCircle (20, 10, 10.5);
circ1.Display (w);
w.Click ();
HRegion marg1 = circ1.Boundary ("inner");
w.SetColor ("red");
marg1.Display (w);
w.Click ();
return(0);
}
Complexity
Let A be the area of the input region. Then the runtime
complexity for one region is
Result
boundary boundary Boundary Boundary Boundary boundary
returns 2 (H_MSG_TRUE ) if all parameters are correct. The
behavior in case of empty or no input region can be set via:
no region:
set_system('no_object_result',<RegionResult>) set_system("no_object_result",<RegionResult>) SetSystem("no_object_result",<RegionResult>) SetSystem("no_object_result",<RegionResult>) SetSystem("no_object_result",<RegionResult>) set_system("no_object_result",<RegionResult>)
empty region:
set_system('empty_region_result',<RegionResult>) set_system("empty_region_result",<RegionResult>) SetSystem("empty_region_result",<RegionResult>) SetSystem("empty_region_result",<RegionResult>) SetSystem("empty_region_result",<RegionResult>) set_system("empty_region_result",<RegionResult>)
Otherwise, an exception is raised.
Possible Predecessors
threshold threshold Threshold Threshold Threshold threshold
,
regiongrowing regiongrowing Regiongrowing Regiongrowing Regiongrowing regiongrowing
,
connection connection Connection Connection Connection connection
,
union1 union1 Union1 Union1 Union1 union1
,
watersheds watersheds Watersheds Watersheds Watersheds watersheds
,
class_ndim_norm class_ndim_norm ClassNdimNorm ClassNdimNorm ClassNdimNorm class_ndim_norm
Possible Successors
reduce_domain reduce_domain ReduceDomain ReduceDomain ReduceDomain reduce_domain
,
select_shape select_shape SelectShape SelectShape SelectShape select_shape
,
area_center area_center AreaCenter AreaCenter AreaCenter area_center
,
connection connection Connection Connection Connection connection
Alternatives
dilation_circle dilation_circle DilationCircle DilationCircle DilationCircle dilation_circle
,
erosion_circle erosion_circle ErosionCircle ErosionCircle ErosionCircle erosion_circle
,
difference difference Difference Difference Difference difference
See also
fill_up fill_up FillUp FillUp FillUp fill_up
Module
Foundation