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CorrelationCommand Class
See Also  Members   Example 
Leadtools.ImageProcessing.Core Namespace : CorrelationCommand Class



This command compares the correlation image(or part of the correlation image) with all the areas of the same dimensions in the image to be searched (the Run method image) and finds those portions that match according to the measure of correlation. This command is available in the Document/Medical Toolkits.

Syntax

Visual Basic (Declaration) 
Public Class CorrelationCommand 
   Inherits RasterCommand
   Implements IRasterCommand 
Visual Basic (Usage)Copy Code
Dim instance As CorrelationCommand
C# 
public class CorrelationCommand : RasterCommand, IRasterCommand 
C++/CLI 
public ref class CorrelationCommand : public RasterCommand, IRasterCommand 

Example

Run the CorrelationCommand on an image and applies the correlation filter.

Visual BasicCopy Code
Public Sub CorrelationCommandExample()
   RasterCodecs.Startup()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim leadImage As RasterImage = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Master.jpg")

   ' Prepare the command
   Dim points() As System.Drawing.Point
   ReDim points(89)

   Dim DstImage As RasterImage = leadImage.Clone()
   Dim command As CorrelationCommand = New CorrelationCommand
   command.CorrelationImage = DstImage
   command.Threshold = 70
   command.XStep = 1
   command.YStep = 1
   command.Points = points
   'Apply the correlation filter.
   command.Run(leadImage)

   RasterCodecs.Shutdown()
End Sub
C#Copy Code
public void CorrelationCommandExample() 
{ 
   // Load an image 
   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Master.jpg"); 
 
   // Prepare the command 
   RasterImage DstImage = image.Clone(); 
   CorrelationCommand command = new CorrelationCommand(); 
   command.CorrelationImage = DstImage; 
   command.Threshold = 70; 
   command.XStep = 1; 
   command.YStep = 1; 
   command.Points = new Point[90]; 
   //Apply the correlation filter. 
   command.Run(image); 
 
   RasterCodecs.Shutdown(); 
}

Remarks

  • This command compares the correlation image (or part of the correlation image) with all the areas of the same dimensions in the image to be searched and finds those portions that match according to the measure of correlation. Correlation is a measure of association (resemblance) between two images. It varies from 0 (zero resemblance) to 100 (perfect resemblance). This command updates the Points property (or the points parameter of the Constructor) with the point of origin for those areas of the image to be searched where the resemblance with the correlation image (or part of the correlation image) is greater than the threshold. The correlation image dimensions must be less than or equal to the dimensions of the iamge to be searched.
  • For example:
    1. Select an image of the object for which you want to look. Put it in the CorrelationImage property (or the correlationImage parameter of the constructor). For example:

    2. Select an image that contains the image you wish to search and put it in the affected image. For example:

    3. Call CorrelationCommand.
    4. The command will update the Points array property (or the points parameter of the Constructor) with the point of origin (top-left) for each area of the image to be searched where the correlation with the correlation image is greater than the correlation threshold. The height and width of the rectangles are the same as for the correlation image.
    5. The result is:

  • This command supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.
  • This command does not support 32-bit grayscale images.
  • All images must be signed or unsigned.
For more information, refer to Introduction to Image Processing With LEADTOOLS.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Core.CorrelationCommand

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also