area_centerarea_centerAreaCenterAreaCenterarea_center (算子名称)

名称

area_centerarea_centerAreaCenterAreaCenterarea_center — Area and center of regions.

参数签名

area_center(区域 : : : Area, Row, Column)

描述

The operator area_centerarea_centerAreaCenterAreaCenterAreaCenterarea_center calculates the area and the center of the input regions. The area is defined as the number of pixels of a region. The center is calculated as the mean value of the line or column coordinates, respectively, of all pixels.

In the documentation of this chapter (Regions / Features), you can find an image illustrating regions which vary in their area.

If more than one region is passed the results are stored in tuples, the index of a value in the tuple corresponding to the index of the input region. In case of empty region all parameters have the value 0.0 if no other behavior was set (see set_systemset_systemSetSystemSetSystemSetSystemset_system).

运行信息

Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Automatically parallelized on tuple level.

参数表

区域区域区域区域区域区域 (input_object) region(-array) → object

Region(s) to be examined.

AreaAreaAreaAreaareaarea (output_control) integer(-array) → (integer)

Area of the region.

RowRowRowRowrowrow (output_control) point.y(-array) → (real)

Line index of the center.

ColumnColumnColumnColumncolumncolumn (output_control) point.x(-array) → (real)

Column index of the center.

Example (C++ (HALCON 5.0-10.0))

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

main()
{
  Tuple   area, row, column;

  HImage   img ("monkey");
  HWindow  w;

  img.Display (w);
  w.Click ();

  HRegionArray   reg = (img >= 164).Connection ();

  reg.Display (w);
  w.Click ();

  area = reg.AreaCenter (&row, &column);

  for (int i = 0; i < reg.Num (); i++)
  {
    cout << "Row    [" << i << "]" << "= " << row[i].D ();
    cout << "\t\tColumn [" << i << "]" << "= " << column[i].D () << endl;
  }

  cout << "Total number of regions: " << reg.Num () << endl;
  return(0);
}

例程 (C)

threshold(&Image,&Seg,120.0,255.0);
connection(Seg,&Connected);
T_area_center(Connected,&Area,&Row,&Column);

Example (C++ (HALCON 5.0-10.0))

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

main()
{
  Tuple   area, row, column;

  HImage   img ("monkey");
  HWindow  w;

  img.Display (w);
  w.Click ();

  HRegionArray   reg = (img >= 164).Connection ();

  reg.Display (w);
  w.Click ();

  area = reg.AreaCenter (&row, &column);

  for (int i = 0; i < reg.Num (); i++)
  {
    cout << "Row    [" << i << "]" << "= " << row[i].D ();
    cout << "\t\tColumn [" << i << "]" << "= " << column[i].D () << endl;
  }

  cout << "Total number of regions: " << reg.Num () << endl;
  return(0);
}

Example (C++ (HALCON 5.0-10.0))

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

main()
{
  Tuple   area, row, column;

  HImage   img ("monkey");
  HWindow  w;

  img.Display (w);
  w.Click ();

  HRegionArray   reg = (img >= 164).Connection ();

  reg.Display (w);
  w.Click ();

  area = reg.AreaCenter (&row, &column);

  for (int i = 0; i < reg.Num (); i++)
  {
    cout << "Row    [" << i << "]" << "= " << row[i].D ();
    cout << "\t\tColumn [" << i << "]" << "= " << column[i].D () << endl;
  }

  cout << "Total number of regions: " << reg.Num () << endl;
  return(0);
}

Example (C++ (HALCON 5.0-10.0))

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

main()
{
  Tuple   area, row, column;

  HImage   img ("monkey");
  HWindow  w;

  img.Display (w);
  w.Click ();

  HRegionArray   reg = (img >= 164).Connection ();

  reg.Display (w);
  w.Click ();

  area = reg.AreaCenter (&row, &column);

  for (int i = 0; i < reg.Num (); i++)
  {
    cout << "Row    [" << i << "]" << "= " << row[i].D ();
    cout << "\t\tColumn [" << i << "]" << "= " << column[i].D () << endl;
  }

  cout << "Total number of regions: " << reg.Num () << endl;
  return(0);
}

Complexity

If F is the area of a region the mean runtime complexity is O(sqrt(F)).

结果

The operator area_centerarea_centerAreaCenterAreaCenterAreaCenterarea_center returns the value 2 ( H_MSG_TRUE) if the input is not empty. The behavior in case of empty input (no input regions available) is set via the operator set_system('no_object_result',<Result>)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)set_system("no_object_result",<Result>). The behavior in case of empty region (the region is the empty set) is set via set_system('empty_region_result',<Result>)set_system("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)set_system("empty_region_result",<Result>). If necessary an exception is raised.

可能的前置算子

thresholdthresholdThresholdThresholdThresholdthreshold, regiongrowingregiongrowingRegiongrowingRegiongrowingRegiongrowingregiongrowing, connectionconnectionConnectionConnectionConnectionconnection

参考其它

select_shapeselect_shapeSelectShapeSelectShapeSelectShapeselect_shape

模块

Foundation

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