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DynamicBinaryCommand Class
See Also  Members   Example 




Converts an image into a black and white image without changing its bits per pixel by using a local threshold value for each pixel of the image. This class is available in the Raster Pro and above toolkits.

Syntax

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

Example

Visual BasicCopy Code
ImageProcessing.Color.DynamicBinaryCommand
   Public Sub DynamicBinaryCommandExample()
      RasterCodecs.Startup()
      Dim codecs As New RasterCodecs()
      codecs.ThrowExceptionsOnInvalidImages = True

      Dim leadImage As RasterImage = codecs.Load("C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Master.jpg")

      ' Prepare the command
      Dim command As DynamicBinaryCommand = New DynamicBinaryCommand
      command.Dimension = 8
      command.LocalContrast = 16
      ' convert it into a black and white image without changing its bits per pixel.
      command.Run(leadImage)
      codecs.Save(leadImage, "C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Result.jpg", RasterImageFormat.Jpeg, 24)

      RasterCodecs.Shutdown()
   End Sub
C#Copy Code
ImageProcessing.Color.DynamicBinaryCommand 
      public void DynamicBinaryCommandExample() 
      { 
         // Load an image 
         RasterCodecs.Startup(); 
         RasterCodecs codecs = new RasterCodecs(); 
         codecs.ThrowExceptionsOnInvalidImages = true; 
 
         RasterImage image = codecs.Load(@"C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Master.jpg"); 
 
         // Prepare the command 
         DynamicBinaryCommand command = new DynamicBinaryCommand(); 
         command.Dimension     = 8; 
         command.LocalContrast = 16; 
         // convert it into a black and white image without changing its bits per pixel. 
         command.Run(image); 
         codecs.Save(image, @"C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Result.jpg", RasterImageFormat.Jpeg, 24); 
 
         RasterCodecs.Shutdown(); 
      }

Remarks

  • This class converts an image into a black and white image without changing its bits per pixel.
  • Each pixel is compared to a dynamically-calculated threshold. If the intensity of the pixel is higher (that is, the pixel is brighter) than the dynamic threshold, the pixel will be set to white. If the intensity of the pixel is lower (that is, the pixel is darker) than the dynamic threshold, the pixel will be set to black.
  • Here are some hints on using this class:
  • Increasing the LocalContrast property increases the number of pixels that use the global threshold. This tends to preserve the general aspect of the image and reduces the improvement in the areas with many details. Reducing the LocalContrast property, increases the contrast in areas with many details.
  • Increasing the Dimension property increases the area used for local contrast. This makes the color changes smoother.
  • This class is good as a prerequisite for converting scanned images to 1-bit, because it uses one threshold for background and another for text.
  • This class 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 class does not support signed data images.
  • This command does not support 32-bit grayscale images.
For more information, refer to Processing an Image.
For more information, refer to Changing Brightness and Contrast.
For more information, refer to Removing Noise.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Color.DynamicBinaryCommand

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