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SobelEdgeDetector Class |
Sobel edge detector.
Inheritance HierarchySystemObject
Accord.Imaging.FiltersBaseUsingCopyPartialFilter
Accord.Imaging.FiltersSobelEdgeDetector
Accord.Imaging.FiltersBaseUsingCopyPartialFilter
Accord.Imaging.FiltersSobelEdgeDetector
Namespace: Accord.Imaging.Filters
Assembly: Accord.Imaging (in Accord.Imaging.dll) Version: 3.8.0
SyntaxThe SobelEdgeDetector type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | SobelEdgeDetector |
Initializes a new instance of the SobelEdgeDetector class.
|
Properties| Name | Description | |
|---|---|---|
 | FormatTranslations |
Format translations dictionary.
(Overrides BaseUsingCopyPartialFilterFormatTranslations.) |
| ScaleIntensity |
Scale intensity or not.
|
Methods| Name | Description | |
|---|---|---|
| Apply(Bitmap) |
Apply filter to an image.
(Inherited from BaseUsingCopyPartialFilter.) |
| Apply(BitmapData) |
Apply filter to an image.
(Inherited from BaseUsingCopyPartialFilter.) |
| Apply(UnmanagedImage) |
Apply filter to an image in unmanaged memory.
(Inherited from BaseUsingCopyPartialFilter.) |
| Apply(UnmanagedImage, UnmanagedImage) |
Apply filter to an image in unmanaged memory.
(Inherited from BaseUsingCopyPartialFilter.) |
| ApplyInPlace(Bitmap) |
Apply filter to an image.
(Inherited from BaseUsingCopyPartialFilter.) |
| ApplyInPlace(BitmapData) |
Apply filter to an image.
(Inherited from BaseUsingCopyPartialFilter.) |
| ApplyInPlace(UnmanagedImage) |
Apply filter to an unmanaged image.
(Inherited from BaseUsingCopyPartialFilter.) |
| ApplyInPlace(Bitmap, Rectangle) |
Apply filter to an image or its part.
(Inherited from BaseUsingCopyPartialFilter.) |
| ApplyInPlace(BitmapData, Rectangle) |
Apply filter to an image or its part.
(Inherited from BaseUsingCopyPartialFilter.) |
| ApplyInPlace(UnmanagedImage, Rectangle) |
Apply filter to an unmanaged image or its part.
(Inherited from BaseUsingCopyPartialFilter.) |
| Equals | Determines whether the specified object is equal to the current object. (Inherited from Object.) |
 | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
| GetHashCode | Serves as the default hash function. (Inherited from Object.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
| ProcessFilter |
Process the filter on the specified image.
(Overrides BaseUsingCopyPartialFilterProcessFilter(UnmanagedImage, UnmanagedImage, Rectangle).) |
| ToString | Returns a string that represents the current object. (Inherited from Object.) |
Extension Methods| Name | Description | |
|---|---|---|
 | HasMethod |
Checks whether an object implements a method with the given name.
(Defined by ExtensionMethods.) |
| IsEqual |
Compares two objects for equality, performing an elementwise
comparison if the elements are vectors or matrices.
(Defined by Matrix.) |
| To(Type) | Overloaded.
Converts an object into another type, irrespective of whether
the conversion can be done at compile time or not. This can be
used to convert generic types to numeric types during runtime.
(Defined by ExtensionMethods.) |
| ToT | Overloaded.
Converts an object into another type, irrespective of whether
the conversion can be done at compile time or not. This can be
used to convert generic types to numeric types during runtime.
(Defined by ExtensionMethods.) |
RemarksThe filter searches for objects' edges by applying Sobel operator.
Each pixel of the result image is calculated as approximated absolute gradient magnitude for corresponding pixel of the source image:
|G| = |Gx| + |Gy] ,
Gx Gy -1 0 +1 +1 +2 +1 -2 0 +2 0 0 0 -1 0 +1 -1 -2 -1
P1 P2 P3
P8 x P4
P7 P6 P5
|G| = |P1 + 2P2 + P3 - P7 - 2P6 - P5| +
|P3 + 2P4 + P5 - P1 - 2P8 - P7|The filter accepts 8 bpp grayscale images for processing.
Sample usage:
// create filter SobelEdgeDetector filter = new SobelEdgeDetector( ); // apply the filter filter.ApplyInPlace( image );
Initial image:
Result image:
See Also