Name
connectionconnectionConnectionconnectionConnectionConnection — Compute connected components of a region.
connectionconnectionConnectionconnectionConnectionConnection determines the connected components of the
input regions given in RegionRegionRegionRegionRegionregion. The neighborhood used for
this can be set via set_system('neighborhood',<4/8>)set_system("neighborhood",<4/8>)SetSystem("neighborhood",<4/8>)set_system("neighborhood",<4/8>)SetSystem("neighborhood",<4/8>)SetSystem("neighborhood",<4/8>).
The default is 8-neighborhood, which is useful for determining the
connected components of the foreground. The maximum number of
connected components that is returned by connectionconnectionConnectionconnectionConnectionConnection can be
set via set_system('max_connection',<Num>)set_system("max_connection",<Num>)SetSystem("max_connection",<Num>)set_system("max_connection",<Num>)SetSystem("max_connection",<Num>)SetSystem("max_connection",<Num>). The default
value of 0 causes all connected components to be returned.
The inverse operator of connectionconnectionConnectionconnectionConnectionConnection is union1union1Union1union1Union1Union1.
- Multithreading type: reentrant (runs in parallel with non-exclusive operators).
- Multithreading scope: global (may be called from any thread).
- Automatically parallelized on internal data level.
read_image(Image,'clip')
dev_set_colored(12)
threshold(Image,Dark,0,150)
count_obj(Dark,NumThresholded)
dev_display (Dark)
connection(Dark,ConnectedRegions)
count_obj(ConnectedRegions,NumConnected)
dev_display (ConnectedRegions)
read_image(&Image,"monkey");
set_colored(WindowHandle,12);
threshold(Image,&Light,150.0,255.0);
count_obj(Light,&Number1);
printf("Number of regions after threshold = %d\n",Number1);
disp_region(Light,WindowHandle);
connection(Light,&Many);
count_obj(Many,&Number2);
printf("Number of regions after threshold = %d\n",Number2);
disp_region(Many,WindowHandle);
read_image(Image,'clip')
dev_set_colored(12)
threshold(Image,Dark,0,150)
count_obj(Dark,NumThresholded)
dev_display (Dark)
connection(Dark,ConnectedRegions)
count_obj(ConnectedRegions,NumConnected)
dev_display (ConnectedRegions)
#include "HIOStream.h"
#if !defined(USE_IOSTREAM_H)
using namespace std;
#endif
#include "HalconCpp.h"
using namespace Halcon;
int main (int argc, char *argv[])
{
HImage image (argv[1]);
HWindow w;
w.SetColored(12);
HRegion Light = image >= 128;
Light.Display(w);
HRegionArray Many = Light.Connection();
cout << "Number of regions after threshold = " << Many.Num();
Many.Display(w);
}
read_image(Image,'clip')
dev_set_colored(12)
threshold(Image,Dark,0,150)
count_obj(Dark,NumThresholded)
dev_display (Dark)
connection(Dark,ConnectedRegions)
count_obj(ConnectedRegions,NumConnected)
dev_display (ConnectedRegions)
read_image(Image,'clip')
dev_set_colored(12)
threshold(Image,Dark,0,150)
count_obj(Dark,NumThresholded)
dev_display (Dark)
connection(Dark,ConnectedRegions)
count_obj(ConnectedRegions,NumConnected)
dev_display (ConnectedRegions)
Let F be the area of the input region and N be the number of
generated connected components. Then the runtime complexity is
O(sqrt(F) * sqrt(N)).
connectionconnectionConnectionconnectionConnectionConnection 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>)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("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>)set_system("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>).
If necessary, an exception is raised.
auto_thresholdauto_thresholdAutoThresholdauto_thresholdAutoThresholdAutoThreshold,
thresholdthresholdThresholdthresholdThresholdThreshold,
dyn_thresholddyn_thresholdDynThresholddyn_thresholdDynThresholdDynThreshold,
erosion1erosion1Erosion1erosion1Erosion1Erosion1
select_shapeselect_shapeSelectShapeselect_shapeSelectShapeSelectShape,
select_grayselect_graySelectGrayselect_graySelectGraySelectGray,
shape_transshape_transShapeTransshape_transShapeTransShapeTrans,
set_coloredset_coloredSetColoredset_coloredSetColoredSetColored,
dilation1dilation1Dilation1dilation1Dilation1Dilation1,
count_objcount_objCountObjcount_objCountObjCountObj,
reduce_domainreduce_domainReduceDomainreduce_domainReduceDomainReduceDomain,
add_channelsadd_channelsAddChannelsadd_channelsAddChannelsAddChannels
background_segbackground_segBackgroundSegbackground_segBackgroundSegBackgroundSeg
set_systemset_systemSetSystemset_systemSetSystemSetSystem,
union1union1Union1union1Union1Union1
Foundation