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DynamicBinaryCommandBitmapEffect Class
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Leadtools.Windows.Media.Effects.Color Namespace : DynamicBinaryCommandBitmapEffect Class




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 DynamicBinaryCommandBitmapEffect 
   Inherits RasterCommandBitmapEffect
Visual Basic (Usage)Copy Code
Dim instance As DynamicBinaryCommandBitmapEffect
C# 
public class DynamicBinaryCommandBitmapEffect : RasterCommandBitmapEffect
Managed Extensions for C++ 
public __gc class DynamicBinaryCommandBitmapEffect : public RasterCommandBitmapEffect
C++/CLI 
public ref class DynamicBinaryCommandBitmapEffect : public RasterCommandBitmapEffect

Example

Run the DynamicBinaryCommandBitmapEffect on an image.

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.

Inheritance Hierarchy

System.Object
   System.Windows.Threading.DispatcherObject
      System.Windows.DependencyObject
         System.Windows.Freezable
            System.Windows.Media.Animation.Animatable
               System.Windows.Media.Effects.BitmapEffect
                  Leadtools.Windows.Media.Effects.RasterCommandBitmapEffect
                     Leadtools.Windows.Media.Effects.Color.DynamicBinaryCommandBitmapEffect

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