dual_thresholddual_thresholdDualThresholdDualThresholddual_threshold (Operator)

dual_threshold(Image : RegionCrossings : MinSize, MinGray, Threshold : )

Herror dual_threshold(const Hobject Image, Hobject* RegionCrossings, const Hlong MinSize, double MinGray, double Threshold)

Herror T_dual_threshold(const Hobject Image, Hobject* RegionCrossings, const Htuple MinSize, const Htuple MinGray, const Htuple Threshold)

void DualThreshold(const HObject& Image, HObject* RegionCrossings, const HTuple& MinSize, const HTuple& MinGray, const HTuple& Threshold)

HRegion HImage::DualThreshold(Hlong MinSize, double MinGray, double Threshold) const

static void HOperatorSet.DualThreshold(HObject image, out HObject regionCrossings, HTuple minSize, HTuple minGray, HTuple threshold)

HRegion HImage.DualThreshold(int minSize, double minGray, double threshold)

def dual_threshold(image: HObject, min_size: int, min_gray: float, threshold: float) -> HObject

Beispiel (HDevelop)

* Edge detection with the Laplace operator (and edge thinning)
diff_of_gauss(Image,Laplace,2.0,1.6)
* find "`positive"' and "`negative"' regions:
dual_threshold(Laplace,Region,20,2,1)
* The zero runnings are the complement to these image section:
complement(Region,ZeroCrossings)

* Simulation of dual_threshold
dual_threshold(Laplace,Result,MinS,MinG,Threshold)
threshold(Laplace,Tmp1,Threshold,999999)
connection(Tmp1,Tmp2)
select_shape(Tmp2,Tmp3,'area','and',MinS,999999)
select_gray(Laplace,Tmp3,Tmp4,'max','and',MinG,999999)
threshold(Laplace,Tmp5,-999999,-Threshold)
connection(Tmp5,Tmp6)
select_shape(Tmp6,Tmp7,'area','and',MinS,999999)
select_gray(Laplace,Tmp7,Tmp8,'min','and',-999999,-MinG)
concat_obj(Tmp4,Tmp8,Result)

Beispiel (C)

/* Edge detection with the Laplace operator (and edge thinning) */
diff_of_gauss(Image,&Laplace,2.0,1.6);
/* find "`positive"' and "`negative"' regions: */
dual_threshold(Laplace,&Region,20,2,1);
/*The zero runnings are the complement to these image section: */
complement(Region,ZeroCrossings);

Beispiel (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[])
{
  if (argc != 2)
  {
    cout << "Usage : " << argv[0] << " 'image' " << endl;
    return (-1);
  }

  HImage       image (argv[1]),
               laplace;
  HWindow      win;

  HRegionArray region,
               nulldg;

  image.Display (win);

  laplace = image.DiffOfGauss (2.0, 1.6);
  region  = laplace.DualThreshold (20, 2, 1);
  nulldg  = region.Complement ();

  laplace.Display (win);     win.Click ();
  region.Display (win);      win.Click ();
  nulldg.Display (win);      win.Click ();

  return (0);
}

Beispiel (HDevelop)

* Edge detection with the Laplace operator (and edge thinning)
diff_of_gauss(Image,Laplace,2.0,1.6)
* find "`positive"' and "`negative"' regions:
dual_threshold(Laplace,Region,20,2,1)
* The zero runnings are the complement to these image section:
complement(Region,ZeroCrossings)

* Simulation of dual_threshold
dual_threshold(Laplace,Result,MinS,MinG,Threshold)
threshold(Laplace,Tmp1,Threshold,999999)
connection(Tmp1,Tmp2)
select_shape(Tmp2,Tmp3,'area','and',MinS,999999)
select_gray(Laplace,Tmp3,Tmp4,'max','and',MinG,999999)
threshold(Laplace,Tmp5,-999999,-Threshold)
connection(Tmp5,Tmp6)
select_shape(Tmp6,Tmp7,'area','and',MinS,999999)
select_gray(Laplace,Tmp7,Tmp8,'min','and',-999999,-MinG)
concat_obj(Tmp4,Tmp8,Result)

Beispiel (HDevelop)

* Edge detection with the Laplace operator (and edge thinning)
diff_of_gauss(Image,Laplace,2.0,1.6)
* find "`positive"' and "`negative"' regions:
dual_threshold(Laplace,Region,20,2,1)
* The zero runnings are the complement to these image section:
complement(Region,ZeroCrossings)

* Simulation of dual_threshold
dual_threshold(Laplace,Result,MinS,MinG,Threshold)
threshold(Laplace,Tmp1,Threshold,999999)
connection(Tmp1,Tmp2)
select_shape(Tmp2,Tmp3,'area','and',MinS,999999)
select_gray(Laplace,Tmp3,Tmp4,'max','and',MinG,999999)
threshold(Laplace,Tmp5,-999999,-Threshold)
connection(Tmp5,Tmp6)
select_shape(Tmp6,Tmp7,'area','and',MinS,999999)
select_gray(Laplace,Tmp7,Tmp8,'min','and',-999999,-MinG)
concat_obj(Tmp4,Tmp8,Result)