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BorderFollowing Class
Border following algorithm for contour extraction.
Inheritance Hierarchy
SystemObject
  Accord.ImagingBorderFollowing

Namespace:  Accord.Imaging
Assembly:  Accord.Imaging (in Accord.Imaging.dll) Version: 3.8.0
Syntax
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public class BorderFollowing : IContourExtractionAlgorithm
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The BorderFollowing type exposes the following members.

Constructors
  NameDescription
Public methodBorderFollowing
Initializes a new instance of the BorderFollowing class.
Public methodBorderFollowing(Byte)
Initializes a new instance of the BorderFollowing class.
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Properties
  NameDescription
Public propertyThreshold
Gets or sets the pixel value threshold above which a pixel is considered white (belonging to the object). Default is zero.
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Methods
  NameDescription
Public methodEquals
Determines whether the specified object is equal to the current object.
(Inherited from Object.)
Protected methodFinalize
Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.
(Inherited from Object.)
Public methodFindContour(Bitmap)
Extracts the contour from a single object in a grayscale image.
Public methodFindContour(BitmapData)
Extracts the contour from a single object in a grayscale image.
Public methodFindContour(UnmanagedImage)
Extracts the contour from a single object in a grayscale image.
Public methodGetHashCode
Serves as the default hash function.
(Inherited from Object.)
Public methodGetType
Gets the Type of the current instance.
(Inherited from Object.)
Protected methodMemberwiseClone
Creates a shallow copy of the current Object.
(Inherited from Object.)
Public methodToString
Returns a string that represents the current object.
(Inherited from Object.)
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Extension Methods
  NameDescription
Public Extension MethodHasMethod
Checks whether an object implements a method with the given name.
(Defined by ExtensionMethods.)
Public Extension MethodIsEqual
Compares two objects for equality, performing an elementwise comparison if the elements are vectors or matrices.
(Defined by Matrix.)
Public Extension MethodTo(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.)
Public Extension MethodToTOverloaded.
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.)
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Examples
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// Create a new border following algorithm
BorderFollowing bf = new BorderFollowing();

// Get all points in the contour of the image. 
List<IntPoint> contour = bf.FindContour(grayscaleImage);

// Mark all points in the contour point list in blue
new PointsMarker(contour, Color.Blue).ApplyInPlace(image);

// Show the result
ImageBox.Show(image);

The resulting image is shown below.

See Also