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 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 image 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.

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

• C#
• Visual Basic
• WinRT C#
• WinRT JavaScript
• Silverlight C#
• Silverlight VB

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Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Core

   
Public Sub CorrelationCommandExample()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True
   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "clean.tif"))

   ' Prepare the command
   Dim points() As LeadPoint
   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)

End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;

      
public void CorrelationCommandExample()
{
   // Load an image
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "clean.tif"));

   // 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 LeadPoint[90];
   //Apply the correlation filter.
   command.Run(image);

}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

function CorrelationCommandExample()
{
   var codecs = new Leadtools.Codecs.RasterCodecs();
   codecs.throwExceptionsOnInvalidImages = true;

   // Load the image
   var srcFileName = "Assets\\Image1.cmp";
   return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFile) {
      return codecs.loadAsync(Leadtools.LeadStreamFactory.create(loadFile));
   }).then(function (image) {
      // Prepare the command
      with (Leadtools.ImageProcessing.Core) {
         var DstImage = image.clone();
         var command = new CorrelationCommand();
         command.correlationImage = DstImage;
         command.threshold = 70;
         command.xStep = 1;
         command.yStep = 1;
         command.points = new Array();
         //Size the array to 90
         for (var i = 0; i < 90; i++)
            command.points[i] = Leadtools.LeadPointHelper.create(0, 0);

         //Apply the correlation filter.
         command.run(image);
      }
   });
}

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;

      
public async Task CorrelationCommandExample()
{
   // Load an image
   RasterCodecs codecs = new RasterCodecs();
   codecs.ThrowExceptionsOnInvalidImages = true;
   // Load the image
   string srcFileName = @"Assets\Image1.cmp";
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));

   // 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 LeadPoint[90];
   //Apply the correlation filter.
   command.Run(image);

}

using Leadtools;
using Leadtools.Examples;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;

public void CorrelationCommandExample(RasterImage image, Stream outStream)
{
   // 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 LeadPoint[90];
   //Apply the correlation filter.
   command.Run(image);
   // Save result image
   RasterCodecs codecs = new RasterCodecs();
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24);
   image.Dispose();
}

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing.Core

Public Sub CorrelationCommandExample(ByVal image As RasterImage, ByVal outStream As Stream)
   ' Prepare the command
   Dim DstImage As RasterImage = image.Clone()
   Dim command As CorrelationCommand = New CorrelationCommand()
   command.CorrelationImage = DstImage
   command.Threshold = 70
   command.XStep = 1
   command.YStep = 1
   command.Points = New LeadPoint(89){}
   'Apply the correlation filter.
   command.Run(image)
   ' Save result image
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24)
   image.Dispose()
End Sub

Target Platforms

Reference

CorrelationCommand Members
Leadtools.ImageProcessing.Core Namespace
Introduction to Image Processing With LEADTOOLS
Leadtools.ImageProcessing.Color.IntensityDetectCommand
Leadtools.ImageProcessing.Effects.SpatialFilterCommand
Leadtools.ImageProcessing.Effects.BinaryFilterCommand
MaximumCommand Class
MinimumCommand Class