Leadtools.ImageProcessing.Color Send comments on this topic. | Back to Introduction - All Topics | Help Version 16.5.9.25
AdaptiveContrastCommand Class
See Also  Members   Example 



Performs adaptive contrast enhancement (ACE) to regions that are originally low in contrast. This command is available in the Medical and above toolkits.

Syntax

Visual Basic (Declaration) 
Public Class AdaptiveContrastCommand 
   Inherits RasterCommand
   Implements IRasterCommand 
Visual Basic (Usage)Copy Code
Dim instance As AdaptiveContrastCommand
C# 
public class AdaptiveContrastCommand : RasterCommand, IRasterCommand 
C++/CLI 
public ref class AdaptiveContrastCommand : public RasterCommand, IRasterCommand 

Example

Run the AdaptiveContrastCommand on an image.

Visual BasicCopy Code
Public Sub AdaptiveContrastCommandExample()
   RasterCodecs.Startup()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim leadImage As RasterImage = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Master.jpg")

   ' Prepare the command
   Dim command As AdaptiveContrastCommand = New AdaptiveContrastCommand
   command.Amount = 200
   command.Dimension = 9
   ' Apply Adaptive Contrast Enhancement.
   command.Run(leadImage)
   codecs.Save(leadImage, LeadtoolsExamples.Common.ImagesPath.Path + "Result.jpg", RasterImageFormat.Jpeg, 24)

   RasterCodecs.Shutdown()
End Sub
C#Copy Code
public void AdaptiveContrastCommandExample() 
{ 
   // Load an image 
   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Master.jpg"); 
 
   // Prepare the command 
   AdaptiveContrastCommand command = new AdaptiveContrastCommand(); 
   command.Amount    = 200; 
   command.Dimension = 9; 
   // Apply Adaptive Contrast Enhancement. 
   command.Run(image); 
   codecs.Save(image, LeadtoolsExamples.Common.ImagesPath.Path + "Result.jpg", RasterImageFormat.Jpeg, 24); 
   RasterCodecs.Shutdown(); 
}

Remarks

  • Adaptive contrast enhancement (ACE) adjusts image contrast by giving more contrast to areas which are originally low in contrast. This is different from histogram-based techniques which are based on all image pixels (the histogram itself).
  • Local histogram equalization is another technique that can be used to reveal detail of areas, since it depends on area pixels only. Use LocalHistogramEqualizeCommand to perform a local histogram equalization.
  • 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.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Color.AdaptiveContrastCommand

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also