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MedianCommand Class
See Also  Members   Example 
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 AverageCommand command, but it is used for noise reduction, rather than a blur effect.

Syntax

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

Example

Run the MedianCommand on an image and applies an median filter.

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

   command.Run(leadImage)

   RasterCodecs.Shutdown()
End Sub
C#Copy Code
public void MedianCommandExample() 
{ 
   // 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 
   MedianCommand command  = new MedianCommand(); 
   //Apply a median filter with a neighborhood of 9x9 pixels. 
   command.Dimension      = 9; 
   command.Run(image); 
 
   RasterCodecs.Shutdown(); 
}

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: 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