MedianCommand Class

Summary

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

Objective-C

C++

Java

public class MedianCommand : RasterCommand

Public Class MedianCommand  
   Inherits RasterCommand

@interface LTMedianCommand : LTRasterCommand

public class MedianCommand extends RasterCommand

public ref class MedianCommand : public RasterCommand

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.
This command supports signed/unsigned data images.

For more information, refer to Removing Noise.

Example

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

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
public void MedianCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, @"ImageProcessingDemo\NaturalFruits.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"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Core 
 
Public Sub MedianCommandExample() 
   Dim codecs As New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "ImageProcessingDemo\\NaturalFruits.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#[Silverlight C# Example] 
using Leadtools; 
using Leadtools.Examples; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
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(); 
} 
vb[Silverlight VB Example] 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Core 
 
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