HALCON Reference Manual 10.0.2
Table of Contents / Regions / Features ClassesClassesClasses | | | Operators

inner_circleinner_circleinner_circleInnerCircleInnerCircle (Operator)

Name

inner_circleinner_circleinner_circleInnerCircleInnerCircle — Largest inner circle of a region.

Signature

inner_circle(Regions : : : Row, Column, Radius)

Herror inner_circle(const Hobject Regions, double* Row, double* Column, double* Radius)

Herror T_inner_circle(const Hobject Regions, Htuple* Row, Htuple* Column, Htuple* Radius)

Herror inner_circle(Hobject Regions, double* Row, double* Column, double* Radius)

Herror inner_circle(Hobject Regions, HTuple* Row, HTuple* Column, HTuple* Radius)

double HRegion::InnerCircle(double* Column, double* Radius) const

HTuple HRegionArray::InnerCircle(HTuple* Column, HTuple* Radius) const

void HOperatorSetX.InnerCircle(
[in] IHUntypedObjectX* Regions, [out] VARIANT* Row, [out] VARIANT* Column, [out] VARIANT* Radius)

VARIANT HRegionX.InnerCircle(
[out] VARIANT* Column, [out] VARIANT* Radius)

static void HOperatorSet.InnerCircle(HObject regions, out HTuple row, out HTuple column, out HTuple radius)

void HRegion.InnerCircle(out HTuple row, out HTuple column, out HTuple radius)

void HRegion.InnerCircle(out double row, out double column, out double radius)

Description

The operator inner_circleinner_circleinner_circleInnerCircleInnerCircle determines the largest inner circle of a region. This is the biggest discrete circle region that completely fits into the region. For this circle the center (RowRowRowRowrow, ColumnColumnColumnColumncolumn) and the radius (RadiusRadiusRadiusRadiusradius) are calculated. If the position of the circle is ambiguous, the "first possible" position (as far upper left as possible) is returned.

The output of the operator is chosen in such a way that it can be used as an input for the operators disp_circledisp_circledisp_circleDispCircleDispCircle, gen_circlegen_circlegen_circleGenCircleGenCircle, and gen_ellipse_contour_xldgen_ellipse_contour_xldgen_ellipse_contour_xldGenEllipseContourXldGenEllipseContourXld.

If several regions are passed in RegionsRegionsRegionsRegionsregions corresponding tuples are returned as output parameters. In case of an empty input region all parameters have the value 0.0 if no other behavior was set with set_systemset_systemset_systemSetSystemSetSystem.

Attention

If several inner circles are present at a region only the most upper left solution is returned.

Parallelization

Parameters

RegionsRegionsRegionsRegionsregions (input_object)  region(-array) → objectHRegionHRegionHRegionXHobject

Regions to be examined.

RowRowRowRowrow (output_control)  circle.center.y(-array) → HTupleHTupleVARIANTHtuple (real) (double) (double) (double) (double)

Line index of the center.

ColumnColumnColumnColumncolumn (output_control)  circle.center.x(-array) → HTupleHTupleVARIANTHtuple (real) (double) (double) (double) (double)

Column index of the center.

RadiusRadiusRadiusRadiusradius (output_control)  circle.radius(-array) → HTupleHTupleVARIANTHtuple (real) (double) (double) (double) (double)

Radius of the inner circle.

Assertion: Radius >= 0

Example (HDevelop)

read_image(Image,'fabrik')
open_window(0,0,-1,-1,'root','visible','',WindowHandle)
regiongrowing(Image,Seg,5,5,6,100)
select_shape(Seg,H,'area','and',100,2000)
inner_circle(H,Row,Column,Radius)
gen_circle(Circles,Row,Column,Radius)
set_draw(WindowHandle,'margin')
disp_region(Circles,WindowHandle)

Example (C)

read_image(&Image,"fabrik");
open_window(0,0,-1,-1,0,"visible","",&WindowHandle);
regiongrowing(Image,&Seg,5,5,6.0,100);
select_shape(Seg,&H,"area","and",100.0,2000.0);
T_inner_circle(H,&Row,&Column,&Radius);
T_gen_circle(&Circles,Row,Column,Radius);
set_draw(WindowHandle,"margin");
disp_region(Circles,WindowHandle);

Example (C++)

#include "HIOStream.h"
#if !defined(USE_IOSTREAM_H)
using namespace std;
#endif
#include "HalconCpp.h"
using namespace Halcon;

int main (int argc, char *argv[])
{
  Tuple    row, col, rad;

  HImage   img (argv[1]);
  HWindow  w;

  img.Display (w);

  HRegionArray  reg  = img.Regiongrowing (5, 5, 6.0, 100);
  HRegionArray  seg  = reg.SelectShape ("area", "and", 100.0, 1000.0);

  row = seg.InnerCircle (&col, &rad);

  HRegionArray  circ = HRegionArray::GenCircle (row, col, rad);

  w.SetDraw   ("margin");

  w.SetColor  ("green");   reg.Display (w);
  w.SetColor  ("blue");    seg.Display (w);
  w.SetColor  ("red");     circ.Display (w);
  w.Click ();

  return(0);
}

Example (HDevelop)

read_image(Image,'fabrik')
open_window(0,0,-1,-1,'root','visible','',WindowHandle)
regiongrowing(Image,Seg,5,5,6,100)
select_shape(Seg,H,'area','and',100,2000)
inner_circle(H,Row,Column,Radius)
gen_circle(Circles,Row,Column,Radius)
set_draw(WindowHandle,'margin')
disp_region(Circles,WindowHandle)

Example (HDevelop)

read_image(Image,'fabrik')
open_window(0,0,-1,-1,'root','visible','',WindowHandle)
regiongrowing(Image,Seg,5,5,6,100)
select_shape(Seg,H,'area','and',100,2000)
inner_circle(H,Row,Column,Radius)
gen_circle(Circles,Row,Column,Radius)
set_draw(WindowHandle,'margin')
disp_region(Circles,WindowHandle)

Complexity

If F is the area of the region and R is the radius of the inner circle the runtime complexity is O(sqrt(F) * R).

Result

The operator inner_circleinner_circleinner_circleInnerCircleInnerCircle returns the value 2 (H_MSG_TRUE) if the input is not empty. The behavior in case of empty input (no input regions available) is set via the operator set_system('no_object_result',<Result>)set_system("no_object_result",<Result>)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>), the behavior in case of empty region is set via set_system('empty_region_result',<Result>)set_system("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.

Possible Predecessors

thresholdthresholdthresholdThresholdThreshold, regiongrowingregiongrowingregiongrowingRegiongrowingRegiongrowing, connectionconnectionconnectionConnectionConnection, runlength_featuresrunlength_featuresrunlength_featuresRunlengthFeaturesRunlengthFeatures

Possible Successors

gen_circlegen_circlegen_circleGenCircleGenCircle, disp_circledisp_circledisp_circleDispCircleDispCircle

Alternatives

erosion_circleerosion_circleerosion_circleErosionCircleErosionCircle, inner_rectangle1inner_rectangle1inner_rectangle1InnerRectangle1InnerRectangle1

See also

set_shapeset_shapeset_shapeSetShapeSetShape, select_shapeselect_shapeselect_shapeSelectShapeSelectShape, smallest_circlesmallest_circlesmallest_circleSmallestCircleSmallestCircle

Module

Foundation

Table of Contents / Regions / Features ClassesClassesClasses | | | Operators
HALCON Reference Manual 10.0.2 Copyright © 1996-2011 MVTec Software GmbH