HighPassCommand Class

Summary

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

Syntax

Objective-C

C++

Java

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:

And you were to call HighPassCommand using the following settings:

Parameter Value

Radius 6

Opacity 100

The following figure results:
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.

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