dilation_rectangle1

Herror ::dilation_rectangle1 ( Hobject Region, Hobject *RegionDilation, const HTuple &Width, const HTuple &Height ) HRegion HRegion::DilationRectangle1 ( const HTuple &Width, const HTuple &Height ) const HRegionArray HRegionArray::DilationRectangle1 ( const HTuple &Width, const HTuple &Height ) const

Dilate a region with a rectangular structuring element.

::dilation_rectangle1 applies a dilation with a rectangular structuring element to the input regions Region. The size of the structuring rectangle is Width x Height. The operator results in enlarged regions, and the holes smaller than the rectangular mask in the interior of the regions are closed.

::dilation_rectangle1 is a very fast operation because the height of the rectangle enters only logarithmically into the runtime complexity, while the width does not enter at all. This leads to excellent runtime efficiency, even in the case of very large rectangles (edge length > 100).

Attention

::dilation_rectangle1 is applied to each input region separately. If gaps between different regions are to be closed, ::union1 or ::union2 has to be called first.

Parameters

`Region` (input_object)	region(-array) `->` Hobject: HRegion(Array)
Regions to be dilated.

`RegionDilation` (output_object)	region(-array) `->` Hobject : HRegion(Array)*
Dilated regions.

`Width` (input_control)	extent.x `->` HTuple.long
Width of the structuring rectangle.
Default value: 10
Suggested values: 1, 2, 3, 4, 6, 10, 15, 20, 30, 50, 70, 100, 150, 200
Typical range of values: `1 <= Width <= 511` (lin)
Minimum increment: 1
Recommended increment: 10

`Height` (input_control)	extent.y `->` HTuple.long
Height of the structuring rectangle.
Default value: 10
Suggested values: 1, 2, 3, 4, 6, 10, 15, 20, 30, 50, 70, 100, 150, 200
Typical range of values: `1 <= Height <= 511` (lin)
Minimum increment: 1
Recommended increment: 10

Example

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

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

  HByteImage img("monkey");
  HWindow    w;

  HRegionArray regs   = (img >= 220).Connection();
  HRegionArray dilreg = regs.DilationRectangle1 (2, 4);

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

  return(0);
}

Complexity

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

       O(sqrt(F1) * ld(H)) .

Result

::dilation_rectangle1 returns H_MSG_TRUE if all parameters are correct. The behavior in case of empty or no input region can be set via:

  a) no region:    set_system('no_object_result',<RegionResult>)
  b) empty region: set_system('empty_region_result',<RegionResult>)

Otherwise, an exception is raised.

Possible Predecessors

::threshold, ::regiongrowing, ::connection, ::union1, ::watersheds, ::class_ndim_norm

Possible Successors

::reduce_domain, ::select_shape, ::area_center, ::connection

Alternatives

::minkowski_add1, ::minkowski_add2, ::expand_region, ::dilation1, ::dilation2, ::dilation_circle

Module

Morphology