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HighPassCommand Class
See Also  Members   Example 
Leadtools.ImageProcessing.Effects Namespace : HighPassCommand Class



Removes low frequency details in an image, resulting in a sharpened image.

Syntax

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

Example

Run the HighPassCommand on an image and applies the HighPass filter.

Visual BasicCopy Code
Public Sub HighPassCommandExample()
   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 HighPassCommand = New HighPassCommand
   command.Radius = 6
   command.Opacity = 100
   command.Run(leadImage)
   codecs.Save(leadImage, LeadtoolsExamples.Common.ImagesPath.Path + "Result.jpg", RasterImageFormat.Jpeg, 24)

   RasterCodecs.Shutdown()
End Sub
C#Copy Code
public void HighPassCommandExample() 
{ 
   // 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 
   HighPassCommand command = new HighPassCommand () ; 
   command.Radius = 6 ; 
   command.Opacity = 100 ; 
   command.Run(image); 
   codecs.Save(image, LeadtoolsExamples.Common.ImagesPath.Path + "Result.jpg", RasterImageFormat.Jpeg, 24); 
 
   RasterCodecs.Shutdown(); 
}

Remarks

  • This command removes low-frequency detail in the image. The method is opposite to that of the Gaussian Blur method
  • To increase the thickness of the edges, increase the value of radius. Usually a low value for radius is better.
  • Unlike the UnsharpMaskCommand, when using this command, the low frequency features are removed from the image.
  • As an example, if you use the following image:

    And you were to call HighPassCommand using the following settings:
    ParameterValue
    Radius6
    Opacity100

    The following figure results:
  • If the image has a region, the command will be applied on the region only.
  • 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 Removing Noise.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Effects.HighPassCommand

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