local_min

local_min ( Image : LocalMinima : : )

Detect all local minima in an image.

local_min extracts all points from Image having a gray value smaller than the gray value of all its neighbors and returns them in LocalMinima. The neighborhood used can be set by set_system(::'neighborhood',<4/8>).

Parameters

`Image` (input_object)	image(-array) `->` object : byte / direction / cyclic / int1 / int2 / uint2 / int4 / real
Image to be processed.

`LocalMinima` (output_object)	region(-array) `->` object
Extracted local minima as regions.
Number of elements: LocalMinima == Image

Example (Syntax: C++)

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

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

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

  image.Display (win);

  HImage       cres = image.CornerResponse (5, 0.04);
  HRegionArray mins = cres.LocalMin ();

  win.SetColored (12);
  mins.Display (win);
  win.Click ();

  return (0);
}

Parallelization Information

local_min is reentrant and automatically parallelized (on tuple level).

Possible Predecessors

gauss_image, smooth_image

Possible Successors

get_region_points, connection

Alternatives

gray_skeleton, lowlands, lowlands_center

Module

Foundation