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HighPassCommand Class

Summary

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

Syntax
C#
VB
Java
Objective-C
C++
public class HighPassCommand : RasterCommand 
Public Class HighPassCommand  
   Inherits RasterCommand 
@interface LTHighPassCommand : LTRasterCommand 
public class HighPassCommand extends RasterCommand 
public ref class HighPassCommand : public RasterCommand   

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: highpassfilterbefore.jpg And you were to call HighPassCommand using the following settings:

    Parameter Value
    Radius 6
    Opacity 100

    The following figure results: highpassfilter.jpg

  • If the image has a region, the command will be applied on the region only.

  • This command supports 12-bit and 16-bit grayscale and 48-bit and 64-bit color images. Support for 12-bit and 16-bit grayscale and 48-bit 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.

Example

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

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Effects; 
 
public void HighPassCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "sample5.cmp")); 
 
   // Prepare the command 
   HighPassCommand command = new HighPassCommand(); 
   command.Radius = 6; 
   command.Opacity = 100; 
   command.Run(image); 
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24); 
 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Effects 
 
Public Sub HighPassCommandExample() 
   Dim codecs As New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "sample5.cmp")) 
 
   ' Prepare the command 
   Dim command As HighPassCommand = New HighPassCommand 
   command.Radius = 6 
   command.Opacity = 100 
   command.Run(leadImage) 
   codecs.Save(leadImage, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24) 
 
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.Codecs; 
using Leadtools.ImageProcessing.Effects; 
using Leadtools.Examples; 
 
public void HighPassCommandExample(RasterImage image, Stream outStream) 
{ 
   // Prepare the command 
   HighPassCommand command = new HighPassCommand(); 
   command.Radius = 6; 
   command.Opacity = 100; 
   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.Effects 
 
Public Sub HighPassCommandExample(ByVal image As RasterImage, ByVal outStream As Stream) 
   ' Prepare the command 
   Dim command As HighPassCommand = New HighPassCommand() 
   command.Radius = 6 
   command.Opacity = 100 
   command.Run(image) 
   ' Save result image 
   Dim codecs As RasterCodecs = New RasterCodecs() 
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24) 
   image.Dispose() 
End Sub 

Requirements

Target Platforms

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Leadtools.ImageProcessing.Effects Assembly