HALCON Reference Manual 10.0.2
Table of Contents / Morphology / Region ClassesClassesClasses | | | Operators

dilation_circledilation_circledilation_circleDilationCircleDilationCircle (Operator)

Name

dilation_circledilation_circledilation_circleDilationCircleDilationCircle — Dilate a region with a circular structuring element.

Signature

dilation_circle(Region : RegionDilation : Radius : )

Herror dilation_circle(const Hobject Region, Hobject* RegionDilation, double Radius)

Herror T_dilation_circle(const Hobject Region, Hobject* RegionDilation, const Htuple Radius)

Herror dilation_circle(Hobject Region, Hobject* RegionDilation, const HTuple& Radius)

HRegion HRegion::DilationCircle(const HTuple& Radius) const

HRegionArray HRegionArray::DilationCircle(const HTuple& Radius) const

void HOperatorSetX.DilationCircle(
[in] IHUntypedObjectX* Region, [out] IHUntypedObjectX** RegionDilation, [in] VARIANT Radius)

IHRegionX* HRegionX.DilationCircle([in] VARIANT Radius)

static void HOperatorSet.DilationCircle(HObject region, out HObject regionDilation, HTuple radius)

HRegion HRegion.DilationCircle(HTuple radius)

HRegion HRegion.DilationCircle(double radius)

Description

dilation_circledilation_circledilation_circleDilationCircleDilationCircle applies a Minkowski addition with a circular structuring element to the input regions RegionRegionRegionRegionregion. Because the circular mask is symmetrical, this is identical to a dilation. The size of the circle used as structuring element is determined by RadiusRadiusRadiusRadiusradius.

The operator results in enlarged regions, smoothed region boundaries, and the holes smaller than the circular mask in the interior of the region are closed. It is useful to select only values like 3.5, 5.5, etc. for RadiusRadiusRadiusRadiusradius in order to avoid a translation of a region, because integer radii result in the circle having a non-integer center of gravity which is rounded to the next integer.

Attention

dilation_circledilation_circledilation_circleDilationCircleDilationCircle is applied to each input region separately. If gaps between different regions are to be closed, union1union1union1Union1Union1 or union2union2union2Union2Union2 has to be called first.

Parallelization

Parameters

RegionRegionRegionRegionregion (input_object)  region(-array) → objectHRegionHRegionHRegionXHobject

Regions to be dilated.

RegionDilationRegionDilationRegionDilationRegionDilationregionDilation (output_object)  region(-array) → objectHRegionHRegionHRegionXHobject *

Dilated regions.

RadiusRadiusRadiusRadiusradius (input_control)  real → HTupleHTupleVARIANTHtuple (real / integer) (double / int / long) (double / Hlong) (double / Hlong) (double / Hlong)

Radius of the circular structuring element.

Default value: 3.5

Suggested values: 1.5, 2.5, 3.5, 4.5, 5.5, 7.5, 9.5, 12.5, 15.5, 19.5, 25.5, 33.5, 45.5, 60.5, 110.5

Typical range of values: 0.5 ≤ Radius Radius Radius Radius radius ≤ 511.5 (lin)

Minimum increment: 1.0

Recommended increment: 1.0

Example (C++)

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

main()
{
  cout << "Reproduction of 'dilation_circle ()'" << endl;
  cout << "First = original image " << endl;
  cout << "Blue  = after dilation " << endl;
  cout << "Red   = before dilation " << endl;

  HByteImage img("monkey");
  HWindow    w;

  HRegion      circ   = HRegion::GenCircle (10, 10, 1.5);
  HRegionArray regs   = (img >= 128).Connection();
  HRegionArray minadd = regs.MinkowskiAdd1 (circ, 1);

                        img.Display (w);      w.Click ();
  w.SetColor ("blue");  minadd.Display (w);   w.Click ();
  w.SetColor ("red");   regs.Display (w);     w.Click ();

  return(0);
}

Example (C)

my_dilation_circle(Hobject In, double Radius, Hobject *Out)
{
  Hobject Circle;
  gen_circle(&Circle,100.0,100.0,Radius);
  minkowski_add1(In,Circle,Out,1);
  clear_obj(Circle);
}

Example (C++)

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

main()
{
  cout << "Reproduction of 'dilation_circle ()'" << endl;
  cout << "First = original image " << endl;
  cout << "Blue  = after dilation " << endl;
  cout << "Red   = before dilation " << endl;

  HByteImage img("monkey");
  HWindow    w;

  HRegion      circ   = HRegion::GenCircle (10, 10, 1.5);
  HRegionArray regs   = (img >= 128).Connection();
  HRegionArray minadd = regs.MinkowskiAdd1 (circ, 1);

                        img.Display (w);      w.Click ();
  w.SetColor ("blue");  minadd.Display (w);   w.Click ();
  w.SetColor ("red");   regs.Display (w);     w.Click ();

  return(0);
}

Example (C++)

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

main()
{
  cout << "Reproduction of 'dilation_circle ()'" << endl;
  cout << "First = original image " << endl;
  cout << "Blue  = after dilation " << endl;
  cout << "Red   = before dilation " << endl;

  HByteImage img("monkey");
  HWindow    w;

  HRegion      circ   = HRegion::GenCircle (10, 10, 1.5);
  HRegionArray regs   = (img >= 128).Connection();
  HRegionArray minadd = regs.MinkowskiAdd1 (circ, 1);

                        img.Display (w);      w.Click ();
  w.SetColor ("blue");  minadd.Display (w);   w.Click ();
  w.SetColor ("red");   regs.Display (w);     w.Click ();

  return(0);
}

Example (C++)

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

main()
{
  cout << "Reproduction of 'dilation_circle ()'" << endl;
  cout << "First = original image " << endl;
  cout << "Blue  = after dilation " << endl;
  cout << "Red   = before dilation " << endl;

  HByteImage img("monkey");
  HWindow    w;

  HRegion      circ   = HRegion::GenCircle (10, 10, 1.5);
  HRegionArray regs   = (img >= 128).Connection();
  HRegionArray minadd = regs.MinkowskiAdd1 (circ, 1);

                        img.Display (w);      w.Click ();
  w.SetColor ("blue");  minadd.Display (w);   w.Click ();
  w.SetColor ("red");   regs.Display (w);     w.Click ();

  return(0);
}

Complexity

Let F1 be the area of an input region. Then the runtime complexity for one region is: 

       O(2 * Radius * sqrt(F1)) .

Result

dilation_circledilation_circledilation_circleDilationCircleDilationCircle returns 2 (H_MSG_TRUE) if all parameters are correct. The behavior in case of empty or no input region can be set via:

Otherwise, an exception is raised.

Possible Predecessors

thresholdthresholdthresholdThresholdThreshold, regiongrowingregiongrowingregiongrowingRegiongrowingRegiongrowing, connectionconnectionconnectionConnectionConnection, union1union1union1Union1Union1, watershedswatershedswatershedsWatershedsWatersheds, class_ndim_normclass_ndim_normclass_ndim_normClassNdimNormClassNdimNorm

Possible Successors

reduce_domainreduce_domainreduce_domainReduceDomainReduceDomain, select_shapeselect_shapeselect_shapeSelectShapeSelectShape, area_centerarea_centerarea_centerAreaCenterAreaCenter, connectionconnectionconnectionConnectionConnection

Alternatives

minkowski_add1minkowski_add1minkowski_add1MinkowskiAdd1MinkowskiAdd1, minkowski_add2minkowski_add2minkowski_add2MinkowskiAdd2MinkowskiAdd2, expand_regionexpand_regionexpand_regionExpandRegionExpandRegion, dilation1dilation1dilation1Dilation1Dilation1, dilation2dilation2dilation2Dilation2Dilation2, dilation_rectangle1dilation_rectangle1dilation_rectangle1DilationRectangle1DilationRectangle1

See also

gen_circlegen_circlegen_circleGenCircleGenCircle, erosion_circleerosion_circleerosion_circleErosionCircleErosionCircle, closing_circleclosing_circleclosing_circleClosingCircleClosingCircle, opening_circleopening_circleopening_circleOpeningCircleOpeningCircle

Module

Foundation

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