UnsharpMaskCommand Class

Summary

Sharpens the image by applying the unsharp mask.

Syntax

Objective-C

C++

Java

public class UnsharpMaskCommand : RasterCommand

Public Class UnsharpMaskCommand  
   Inherits RasterCommand

@interface LTUnsharpMaskCommand : LTRasterCommand

public class UnsharpMaskCommand extends RasterCommand

public ref class UnsharpMaskCommand : public RasterCommand

Remarks

This command is actually considered a sharpening method. It is used to sharpen the image with a minimum of noise. To reduce the noise, it starts by blurring a copy of the original image. The amount of blur depends on Radius. The method then determines the difference between each pixel's value of the original image and the corresponding pixel's value in the blurred image. If the difference is greater than the threshold value, then the difference between the pixel values is multiplied by the amount value and added to the original pixel value.
To increase the thickness of the sharpened edges, increase the radius value.
To increase the amount of sharpness, increase the amount value.
To reduce the noise and eliminate the small edges or individual pixels that will produce noise in image, increase the threshold value.
Using the Yuv color space decreases the processing time.
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.
This command supports signed/unsigned data images.

For more information, refer to Detecting and Enhancing Edges and Lines.

Example

Run the UnsharpMaskCommand on an image.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Effects; 
 
public void UnsharpMaskCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1.CMP")); 
 
   // Prepare the command 
   UnsharpMaskCommand command = new UnsharpMaskCommand(); 
   command.Amount = 200; 
   command.Radius = 15; 
   command.Threshold = 50; 
   command.ColorType = UnsharpMaskCommandColorType.Rgb; 
   command.Run(image); 
 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Effects 
 
Public Sub UnsharpMaskCommandExample() 
   Dim codecs As New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1.CMP")) 
 
   ' Prepare the command 
   Dim command As UnsharpMaskCommand = New UnsharpMaskCommand 
   command.Amount = 200 
   command.Radius = 15 
   command.Threshold = 50 
   command.ColorType = UnsharpMaskCommandColorType.Rgb 
   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:\LEADTOOLS21\Resources\Images" 
End Class