Leadtools.ImageProcessing.Effects Send comments on this topic. | Back to Introduction - All Topics | Help Version 16.5.9.25
UnsharpMaskCommand Class
See Also  Members   Example 
Leadtools.ImageProcessing.Effects Namespace : UnsharpMaskCommand Class



Sharpens the image by applying the unsharp mask.

Syntax

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

Example

Run the UnsharpMaskCommand on an image.

Visual BasicCopy Code
Public Sub UnsharpMaskCommandExample()
   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 UnsharpMaskCommand = New UnsharpMaskCommand
   command.Amount = 200
   command.Radius = 15
   command.Threshold = 50
   command.ColorType = UnsharpMaskCommandColorType.Rgb
   command.Run(leadImage)
   codecs.Save(leadImage, LeadtoolsExamples.Common.ImagesPath.Path + "Result.jpg", RasterImageFormat.Jpeg, 24)

   RasterCodecs.Shutdown()
End Sub
C#Copy Code
public void UnsharpMaskCommandExample() 
{ 
   // 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 
   UnsharpMaskCommand command = new UnsharpMaskCommand(); 
   command.Amount = 200; 
   command.Radius = 15; 
   command.Threshold = 50; 
   command.ColorType = UnsharpMaskCommandColorType.Rgb; 
   command.Run(image); 
 
   RasterCodecs.Shutdown(); 
}

Remarks

  • This command 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 method 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 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.
  • This command does not support 32-bit grayscale images.
For more information, refer to Detecting and Enhancing Edges and Lines.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Effects.UnsharpMaskCommand

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