LEADTOOLS Image Processing (Leadtools.ImageProcessing.Effects assembly) Send comments on this topic. | Back to Introduction - All Topics | Help Version 17.0.3.29
EdgeDetectorCommand Class
See Also  Members  
Leadtools.ImageProcessing.Effects Namespace : EdgeDetectorCommand Class



Applies the specified edge filter to an image. This command is available in the Document Toolkits. Supported in Silverlight, Windows Phone 7

Object Model

EdgeDetectorCommand Class

Syntax

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

Example

Run the Leadtools.ImageProcessing.Effects.EdgeDetectorCommand on an image.

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

   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"))

   ' Prepare the command
   Dim command As EdgeDetectorCommand = New EdgeDetectorCommand
   command.Threshold = 60
   command.Filter = EdgeDetectorCommandType.SobelBoth
   'find the edges of the image.
   command.Run(leadImage)
   codecs.Save(leadImage, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24)

End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
C#Copy Code
public void EdgeDetectorCommandExample()
   {
      // Load an image
      RasterCodecs codecs = new RasterCodecs();
      codecs.ThrowExceptionsOnInvalidImages = true;

      RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"));

      // Prepare the command
      EdgeDetectorCommand command = new EdgeDetectorCommand();
      command.Threshold = 60;
      command.Filter = EdgeDetectorCommandType.SobelBoth;
      //find the edges of the image.
      command.Run(image);
      codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24);

   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
SilverlightCSharpCopy Code
public void EdgeDetectorCommandExample(RasterImage image, Stream outStream)
{
   // Prepare the command
   EdgeDetectorCommand command = new EdgeDetectorCommand();
   command.Threshold = 60;
   command.Filter = EdgeDetectorCommandType.SobelBoth;
   //find the edges of the image.
   command.Run(image);
   // Save result image
   RasterCodecs codecs = new RasterCodecs();
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24);
   image.Dispose();
}
SilverlightVBCopy Code
Public Sub EdgeDetectorCommandExample(ByVal image As RasterImage, ByVal outStream As Stream)
   ' Prepare the command
   Dim command As EdgeDetectorCommand = New EdgeDetectorCommand()
   command.Threshold = 60
   command.Filter = EdgeDetectorCommandType.SobelBoth
   'find the edges of the image.
   command.Run(image)
   ' Save result image
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24)
   image.Dispose()
End Sub

Remarks

  • Filters such as Sobel filter, Prewitt filter, Laplacian filter, and Gradient filter are used to determine the pixels belonging to edges in the image.
  • The threshold range for the 16, 48, and 64-bit images is from 0 to 65535 and for 12-bit images from 0 to 4095. Otherwise, it is from 0 to 255. The threshold is applied on channels separately.
  • 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.
For more information, refer to Detecting and Enhancing Edges and Lines.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Effects.EdgeDetectorCommand

Requirements

Target Platforms: Silverlight 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7, MAC OS/X (Intel Only)

See Also