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CLAHECommand Class

Summary

Adjusts the image contrast using the Contrast Limited Adaptive Histogram Equalizer (CLAHE) method, Which uses several histograms, each corresponding to a distinct section in the image, while limiting the amplification of the noise in the image.

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

Remarks
  • This command supports 16-bit grayscale images. Support for 16-bit grayscale images is available in the Document and Medical Imaging toolkits
  • This command does not support 32-bit grayscale images.

Example
C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
public void CLAHECommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE3.dcm")); 
   string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "CLAHERes.Tif"); 
 
   // Prepare the command 
   CLAHECommand command = new CLAHECommand(); 
 
   //Apply a CLAHE filter. 
   command.Flags = CLAHECommandFlags.ApplyRayliehDistribution; 
   command.AlphaFactor = 0.65f; 
   command.TileHistClipLimit = 0.08f; 
   command.TilesNumber = 6; 
   command.BinNumber = 128; 
   command.Run(image); 
 
   // Save it to disk 
   codecs.Save(image, destFileName, RasterImageFormat.Tif, 16); 
 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Core 
 
Public Sub CLAHECommandExample() 
   Dim codecs As New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE3.dcm")) 
 
   ' Prepare the command 
   Dim command As CLAHECommand = New CLAHECommand 
   'Apply a CLAHE filter. 
   command.Flags = CLAHECommandFlags.ApplyRayliehDistribution 
   command.AlphaFactor = 0.65F 
   command.TileHistClipLimit = 0.08F 
   command.TilesNumber = 6 
   command.BinNumber = 128 
   command.Run(leadImage) 
 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class 

Requirements

Target Platforms

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Leadtools.ImageProcessing.Core Assembly