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HighPassCommand Class

Summary
Removes low frequency details in an image, resulting in a sharpened image.
Syntax
C#
Objective-C
C++/CLI
Java
Python
public class HighPassCommand : RasterCommand 
@interface LTHighPassCommand : LTRasterCommand 
public class HighPassCommand 
    extends RasterCommand 
public ref class HighPassCommand : public RasterCommand   
class HighPassCommand(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.

High Pass Function - Before

High Pass Function - Before

High Pass Function - After

High Pass Function - After

View additional platform support for this High Pass function.

Example

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

C#
Java
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:\LEADTOOLS23\Resources\Images"; 
} 
 
import java.io.File; 
import java.io.IOException; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.codecs.*; 
import leadtools.imageprocessing.effects.HighPassCommand; 
 
 
public void highPassCommandExample() { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.setThrowExceptionsOnInvalidImages(true); 
 
   RasterImage image = codecs.load(combine(LEAD_VARS_IMAGES_DIR, "sample5.cmp")); 
 
   // Prepare the command 
   HighPassCommand command = new HighPassCommand(); 
   command.setRadius(6); 
   command.setOpacity(100); 
   int change = command.run(image); 
   assertTrue(change != RasterImageChangedFlags.NONE); 
 
   codecs.save(image, combine(LEAD_VARS_IMAGES_DIR, "Result.jpg"), RasterImageFormat.JPEG, 24); 
   System.out.println("Command run and image saved to " + combine(LEAD_VARS_IMAGES_DIR, "Result.jpg")); 
} 
Requirements

Target Platforms

Help Version 23.0.2024.3.3
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© 1991-2024 LEAD Technologies, Inc. All Rights Reserved.

Leadtools.ImageProcessing.Effects Assembly
Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.