Leadtools.Workflow.ImageProcessing Requires Document/Medical product license | Send comments on this topic. | Back to Introduction - All Topics | Help Version 16.5.9.25
DynamicBinaryActivity Class
See Also  Members  
Leadtools.Workflow.ImageProcessing Namespace : DynamicBinaryActivity 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 function is useful for pre-processing images for the purpose of improving barcode recognition results.

Syntax

Visual Basic (Declaration) 
Public Class DynamicBinaryActivity 
   Inherits ImageProcessingBaseActivity
Visual Basic (Usage)Copy Code
Dim instance As DynamicBinaryActivity
C# 
public class DynamicBinaryActivity : ImageProcessingBaseActivity
C++/CLI 
public ref class DynamicBinaryActivity : public ImageProcessingBaseActivity

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 activity does not support 32-bit grayscale images.
Use the AutoBinaryActivity when you simply want to apply binary segmentation to the bitmap using an automatically calculated threshold based on a two-peak method of statistical analysis on its histogram. Use the DynamicBinaryActivity to convert an image into a black and white image without changing its bits per pixel. For more information, refer to Introduction to Image Processing With LEADTOOLS.
For more information, refer to Changing Brightness and Contrast.
For more information, refer to Removing Noise.

Inheritance Hierarchy

System.Object
   System.Workflow.ComponentModel.DependencyObject
      System.Workflow.ComponentModel.Activity
         Leadtools.Workflow.Raster.WorkflowImageActivity
            Leadtools.Workflow.Raster.DisposableImageActivity
               Leadtools.Workflow.ImageProcessing.ImageProcessingBaseActivity
                  Leadtools.Workflow.ImageProcessing.DynamicBinaryActivity

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

Leadtools.Workflow.ImageProcessing requires a Document or Medical toolkit license and unlock key. For more information, refer to: Imaging Pro/Document/Medical Features