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Median Method

Summary

Changes the color of each pixel in an image to the median color of pixels in its neighborhood. This is similar to the Average operation, but it is used for noise reduction, rather than a blur effect.

Syntax

C#
VB
C++
[OperationContractAttribute(Action="Median", 
   AsyncPattern=false, 
   IsOneWay=false, 
   IsInitiating=true, 
   IsTerminating=false)] 
[FaultContractAttribute(System.Type)] 
public CommandResponse Median( 
   MedianRequest request 
) 
  
<FaultContractAttribute(DetailType=Leadtools.Services.Raster.FaultContracts.RasterFault,  
   Action="",  
   Name="",  
   Namespace="",  
   ProtectionLevel=ProtectionLevel.None,  
   HasProtectionLevel=False)> 
<OperationContractAttribute("Median")> 
Function Median( _ 
   ByVal request As Leadtools.Services.Imageprocessing.Datacontracts.MedianRequest _ 
) As Leadtools.Services.Imageprocessing.Datacontracts.CommandResponse 
[FaultContractAttribute(DetailType=Leadtools.Services.Raster.FaultContracts.RasterFault,  
   Action="",  
   Name="",  
   Namespace="",  
   ProtectionLevel=ProtectionLevel.None,  
   HasProtectionLevel=false)] 
[OperationContractAttribute("Median")] 
Leadtools.Services.Imageprocessing.Datacontracts.CommandResponse^ Median(  
   Leadtools.Services.Imageprocessing.Datacontracts.MedianRequest^ request 
)  

Parameters

request
A System.Runtime.Serialization.DataContractAttribute containing the data that will be used in this Median operation.

Return Value

A System.Runtime.Serialization.DataContractAttribute containing the modified image resulting from the Median operation.

Remarks
  • You control the effect by specifying the size of the neighborhood that is used for calculating the median value. For example, for 8x8, set Leadtools.Services.ImageProcessing.DataContracts.MedianRequest.Dimension property(or the dimension parameter of the Constructor)to 8.
  • This operation 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 operation does not support 32-bit grayscale images.

For more information, refer to Removing Noise.

Example

C#
VB
using Leadtools.Services; 
 
public void MedianExample() 
{ 
   FiltersProcessingServiceClient client = new FiltersProcessingServiceClient(); 
 
   RawBinaryData sourceBinaryData = new RawBinaryData(); 
   sourceBinaryData.Data = File.ReadAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "image1.cmp")); 
 
   RasterConvertOptions convertOptions = new RasterConvertOptions(); 
 
   convertOptions.Source = sourceBinaryData; 
   convertOptions.Destination = null; 
   convertOptions.Format = RasterImageFormat.Bmp; 
   convertOptions.FirstPage = 1; 
   convertOptions.LastPage = 1; 
   convertOptions.BitsPerPixel = 24; 
   convertOptions.QualityFactor = 2; 
 
   MedianRequest request = new MedianRequest(); 
 
   request.ConvertOptions = convertOptions; 
   request.Dimension = 9; 
   request.RegionData = null; 
 
   CommandResponse response = client.Median(request); 
   if (response.Destination != null) 
   { 
      if (response.Destination is RawBinaryData) 
         File.WriteAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "Median.bmp"), (response.Destination as RawBinaryData).Data); 
   } 
 
   client.Close(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
} 
Imports Leadtools.Services 
Imports Leadtools.Services.datacontracts._2009._01 
Imports Leadtools.Services.raster.datacontracts._2009._01 
Imports Leadtools.Services.ImageProcessing.datacontracts._2009._01 
 
Public Sub MedianExample() 
   Dim client As FiltersProcessingServiceClient = New FiltersProcessingServiceClient() 
 
   Dim sourceBinaryData As RawBinaryData = New RawBinaryData() 
   sourceBinaryData.Data = File.ReadAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "image1.cmp")) 
 
   Dim convertOptions As RasterConvertOptions = New RasterConvertOptions() 
 
   convertOptions.Source = sourceBinaryData 
   convertOptions.Destination = Nothing 
   convertOptions.Format = RasterImageFormat.Bmp 
   convertOptions.FirstPage = 1 
   convertOptions.LastPage = 1 
   convertOptions.BitsPerPixel = 24 
   convertOptions.QualityFactor = 2 
 
   Dim request As MedianRequest = New MedianRequest() 
 
   request.ConvertOptions = convertOptions 
   request.Dimension = 9 
   request.RegionData = Nothing 
 
   Dim response As CommandResponse = client.Median(request) 
   If Not response.Destination Is Nothing Then 
      If TypeOf response.Destination Is RawBinaryData Then 
         File.WriteAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "Median.bmp"), (TryCast(response.Destination, RawBinaryData)).Data) 
      End If 
   End If 
 
   client.Close() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class 

Requirements

Target Platforms

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