Segment two images by clustering.

::class_2dim_unsup performs a classification with two single-channel images. First a two-dimensional histogram of the two images is computed (::histo_2dim). In this histogram the first maximum is extracted; it serves as the first cluster center. The histogram is computed with the intersection of the domains of both images (see ::reduce_domain). After this, all pixels in the images, which are at most Threshold pixels from the cluster center in the maximum norm, are determined. These pixels form one output region. Next, the pixels thus classified are deleted from the histogram so that they are not taken into account for the next class. In this modified histogram again the maximum is extracted; it again serves as a cluster center. The above steps are repeated NumClasses times; thus, NumClasses output regions result. Only pixels defined in both images are returned.

Both input images must have the same size.

#include  "HalconCpp.h"
#include  <iostream.h>

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

  HImage   colimg (argv[1]),
           green, blue;

  HWindow  w;
  long     nc;

  if ((nc = colimg.CountChannels ()) != 3)
  {
    cout << argv[1] << " is not a rgb-image " << endl;
    return (-2);
  }

  colimg.Display (w);

  HImage        red = colimg.Decompose3 (&green, &blue);
  HRegionArray  seg = red.Class2dimUnsup (green, 15, 5);

  w.SetDraw ("margin");
  w.SetColored (12);
  seg.Display (w);
  w.Click ();

  return (0);
}

::class_2dim_unsup returns H_MSG_TRUE if all parameters are correct. The behavior with respect to the input images and output regions can be determined by setting the values of the flags 'no_object_result', 'empty_region_result', and 'store_empty_region' with ::set_system. If necessary, an exception is raised.

::decompose2, ::decompose3, ::median_image, ::anisotrope_diff, ::reduce_domain

::select_shape, ::select_gray, ::connection

::threshold, ::histo_2dim, ::class_2dim_sup, ::class_ndim_norm, ::class_ndim_box

Region processing