The PredefinedSpatialActivity Class is available in LEADTOOLS Document and Medical Imaging toolkits.
Imposes a predefined spatial filter on an image. This activity is available in the Document/Medical Toolkits.
Object Model
Syntax
| Visual Basic (Declaration) | |
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Public Class PredefinedSpatialActivity Inherits ImageProcessingBaseActivity Implements IComponent, IDisposable | |
| Visual Basic (Usage) |  Copy Code |
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Dim instance As PredefinedSpatialActivity | |
| C# | |
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public class PredefinedSpatialActivity : ImageProcessingBaseActivity, IComponent, IDisposable | |
| C++/CLI | |
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public ref class PredefinedSpatialActivity : public ImageProcessingBaseActivity, IComponent, IDisposable | |
Remarks
- A spatial filter recomputes the brightness of each pixel in an image by using a weighted averaging technique that considers the surrounding pixels. Spatial filters are used for operations such as sharpening an image or detecting edges within the image.
- The SpatialFilterCommand works best with 24-bit, 16-bit, or grayscale images. If the image uses a color palette, this activity matches the new brightness value of each pixel to the nearest color in the existing palette.
- This activity 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.
- It is beyond the scope of this documentation to explain how applying various weighting factors affects an image. If you specify your own filter, you should refer to a textbook on image processing. For example, Digital Image Processing: Principles and Applications, by Gregory A. Baxes.
- This activity does not support 32-bit grayscale images.
For more information, refer to List of Spatial Filters.
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.PredefinedSpatialActivity
Requirements
Target Platforms: Microsoft .NET Framework 3.0, Windows 2000, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7