LEADTOOLS Image Processing (Leadtools.ImageProcessing.Core assembly) Send comments on this topic. | Back to Introduction - All Topics | Help Version 17.0.3.29
MedianCommand Class
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Leadtools.ImageProcessing.Core Namespace : MedianCommand Class



Changes the color of each pixel in an image to the median color of pixels in its neighborhood. This is similar to the Leadtools.ImageProcessing.Effects.AverageCommand command, but it is used for noise reduction, rather than a blur effect. Supported in Silverlight, Windows Phone 7

Object Model

MedianCommand Class

Syntax

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

Example

Run the Leadtools.ImageProcessing.Core.MedianCommand on an image and applies an median filter.

Visual BasicCopy Code
Public Sub MedianCommandExample()
   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 MedianCommand = New MedianCommand
   'Apply a median filter with a neighborhood of 9x9 pixels.
   command.Dimension = 9

   command.Run(leadImage)

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 MedianCommandExample()
   {
      // Load an image
      RasterCodecs codecs = new RasterCodecs();
      codecs.ThrowExceptionsOnInvalidImages = true;

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

      // Prepare the command
      MedianCommand command  = new MedianCommand();
      //Apply a median filter with a neighborhood of 9x9 pixels.
      command.Dimension      = 9;
      command.Run(image);

   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
SilverlightCSharpCopy Code
public void MedianCommandExample(RasterImage image, Stream outStream)
{
   // Prepare the command
   MedianCommand command  = new MedianCommand();
   //Apply a median filter with a neighborhood of 9x9 pixels.
   command.Dimension      = 9;
   command.Run(image);
   // Save result image
   RasterCodecs codecs = new RasterCodecs();
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24);
   image.Dispose();
}
SilverlightVBCopy Code
Public Sub MedianCommandExample(ByVal image As RasterImage, ByVal outStream As Stream)
   ' Prepare the command
   Dim command As MedianCommand = New MedianCommand()
   'Apply a median filter with a neighborhood of 9x9 pixels.
   command.Dimension = 9
   command.Run(image)
   ' Save result image
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24)
   image.Dispose()
End Sub

Remarks

  • You control the effect by specifying the size of the neighborhood that is used for calculating the median value. For 8x8, 8 in the Dimension property or pass the value 8 for the dimension parameter of the Constructor.
  • 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.
  • If the image has a region, this command works only on the region. If the image does not have a region, this command works on the entire image.
  • This command does not support 32-bit grayscale images.
For more information, refer to Removing Noise.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Core.MedianCommand

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