ObjectCounterCommand Class

Summary

Gets the number of black objects in a binary image.

Syntax

C++

public class ObjectCounterCommand : RasterCommand

Public Class ObjectCounterCommand  
   Inherits RasterCommand

public ref class ObjectCounterCommand : public RasterCommand

Remarks

This command retrieves the number of black objects on a white background in a binary image. The behavior of this command can be further modified by using an Event Handler that handles the ObjectCounterCommandEventArgs.
This command works only on 1-bit black and white images.
If a region is selected, only the selected region will be changed by this command. If no region selected, the entire image will be processed.
This command does not support signed data images.

Example

Runs the ObjectCounterCommand on an image.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
public void ObjectCounterCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, @"ImageProcessingDemo\Image4.tif")); 
 
   // Prepare the command 
   ObjectCounterCommand command = new ObjectCounterCommand(); 
   command.ObjectCounter += new EventHandler<ObjectCounterCommandEventArgs>(ObjectCounterEvent_S1); 
   command.Run(image); 
 
   MessageBox.Show("ObjectCountis" + "( " + command.Count + " )"); 
 
} 
 
private void ObjectCounterEvent_S1(object sender, ObjectCounterCommandEventArgs e) 
{ 
   int RegionPixelSize; 
   RegionPixelSize = 0; 
 
   for (int i = e.ObjectRectangle.Left; i < e.ObjectRectangle.Right; i++) 
   { 
      for (int j = e.ObjectRectangle.Top; j < e.ObjectRectangle.Bottom; j++) 
      { 
         if (e.ObjectData[i - e.ObjectRectangle.Left][j - e.ObjectRectangle.Top] == 1) 
         { 
            RegionPixelSize++; 
         } 
      } 
   } 
 
   MessageBox.Show("Region size in pixels is" + "( " + RegionPixelSize + " )"); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Core 
 
Public Sub ObjectCounterCommandExample() 
   ' Load an image 
   Dim codecs As RasterCodecs = New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "ImageProcessingDemo\\Image4.tif")) 
 
   ' Prepare the command 
   Dim command As ObjectCounterCommand = New ObjectCounterCommand() 
   AddHandler command.ObjectCounter, AddressOf ObjectCounterEvent_S1 
   command.Run(image) 
 
   MessageBox.Show("ObjectCountis" + "( " + command.Count.ToString() + " )") 
 
End Sub 
 
Private Sub ObjectCounterEvent_S1(ByVal sender As Object, ByVal e As ObjectCounterCommandEventArgs) 
 
   Dim nRegionPixelSize As Integer 
   Dim i As Integer 
   Dim j As Integer 
   nRegionPixelSize = 0 
   For i = e.ObjectRectangle.Left To e.ObjectRectangle.Right - 1 
      For j = e.ObjectRectangle.Top To e.ObjectRectangle.Bottom - 1 
         nRegionPixelSize = nRegionPixelSize + 1 
      Next j 
   Next i 
   MessageBox.Show("Region size in pixels is " + "( " + nRegionPixelSize.ToString() + " )") 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\LEADTOOLS21\Resources\Images" 
End Class

Requirements

Target Platforms

Reference

ObjectCounterCommand Members

Leadtools.ImageProcessing.Core Namespace

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Help Version 21.0.2021.7.2

Leadtools.ImageProcessing.Core Assembly

Introduction

Getting Started

Namespaces

Leadtools.ImageProcessing.Core Namespace

Assemblies