The DynamicBinaryActivity Class is available in LEADTOOLS Document and Medical Imaging toolkits.
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.
Object Model
Syntax
| Visual Basic (Declaration) | |
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Public Class DynamicBinaryActivity Inherits ImageProcessingBaseActivity Implements IComponent, IDisposable | |
| Visual Basic (Usage) |  Copy Code |
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Dim instance As DynamicBinaryActivity | |
| C# | |
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public class DynamicBinaryActivity : ImageProcessingBaseActivity, IComponent, IDisposable | |
| C++/CLI | |
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public ref class DynamicBinaryActivity : public ImageProcessingBaseActivity, IComponent, IDisposable | |
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.
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 3.0, Windows 2000, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7