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UnsharpMask Method

Summary

Sharpens the image by applying the unsharp mask.

Syntax

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

Parameters

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

Return Value

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

Remarks
  • This operation is actually considered a sharpening method. It is used to sharpen the image with a minimum of noise. To reduce the noise, it starts by blurring a copy of the original image. The amount of blur depends on Radius. The operation then determines the difference between each pixel's value of the original image and the corresponding pixel's value in the blurred image. If the difference is greater than the threshold value, then the difference between the pixel values is multiplied by the amount value and added to the original pixel value.
  • To increase the thickness of the sharpened edges, increase the radius value.
  • To increase the amount of sharpness, increase the amount value.
  • To reduce the noise and eliminate the small edges or individual pixels that will produce noise in image, increase the threshold value.
  • Using the Yuv color space decreases the processing time.
  • 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.
  • This operation does not support 32-bit grayscale images.

For more information, refer to Detecting and Enhancing Edges and Lines.

Example

C#
VB
using Leadtools.Services; 
 
public void UnsharpMaskExample() 
{ 
   EffectsProcessingServiceClient client = new EffectsProcessingServiceClient(); 
 
   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; 
 
   UnsharpMaskRequest request = new UnsharpMaskRequest(); 
   request.ConvertOptions = convertOptions; 
   request.RegionData = null; 
   request.Amount = 200; 
   request.Radius = 15; 
   request.Threshold = 50; 
   request.ColorType = UnsharpMaskCommandColorType.Rgb; 
 
   CommandResponse response = client.UnsharpMask(request); 
   if (response.Destination != null) 
   { 
      if (response.Destination is RawBinaryData) 
         File.WriteAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "UnsharpMask.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 UnsharpMaskExample() 
   Dim client As EffectsProcessingServiceClient = New EffectsProcessingServiceClient() 
 
   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 UnsharpMaskRequest = New UnsharpMaskRequest() 
   request.ConvertOptions = convertOptions 
   request.RegionData = Nothing 
   request.Amount = 200 
   request.Radius = 15 
   request.Threshold = 50 
   request.ColorType = UnsharpMaskCommandColorType.Rgb 
 
   Dim response As CommandResponse = client.UnsharpMask(request) 
   If Not response.Destination Is Nothing Then 
      If TypeOf response.Destination Is RawBinaryData Then 
         File.WriteAllBytes(Path.Combine(LEAD_VARS.ImagesDir, "UnsharpMask.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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