HighPassCommand Class

Summary

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

Syntax

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:

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.

High Pass Function - Before

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.

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")); 
}