BinaryWatershed Class

Watershed filter.

Inheritance Hierarchy

SystemObject
Accord.Imaging.FiltersBaseInPlaceFilter
Accord.Imaging.FiltersBinaryWatershed

Namespace: Accord.Imaging.Filters
Assembly: Accord.Imaging (in Accord.Imaging.dll) Version: 3.8.0

Syntax

Copy

public class BinaryWatershed : BaseInPlaceFilter

Public Class BinaryWatershed
	Inherits BaseInPlaceFilter

Request Example View Source

The BinaryWatershed type exposes the following members.

Constructors

	Name	Description
	BinaryWatershed	Initializes a new instance of the BinaryWatershed class.
	BinaryWatershed(Single)	Initializes a new instance of the BinaryWatershed class.
	BinaryWatershed(DistanceTransformMethod)	Initializes a new instance of the BinaryWatershed class.
	BinaryWatershed(Single, DistanceTransformMethod)	Initializes a new instance of the BinaryWatershed class.

Top

Properties

	Name	Description
	Distance	Gets or sets the distance method to be used in the underlying DistanceTransform.
	FormatTranslations	Format translations dictionary. (Overrides BaseInPlaceFilterFormatTranslations.)
	MaxPoints	Gets the list of maximum points found in the image.
	Tolerance	Gets or sets the tolerance. Default is 0.5f.

Top

Methods

	Name	Description
	Apply(Bitmap)	Apply filter to an image. (Inherited from BaseInPlaceFilter.)
	Apply(BitmapData)	Apply filter to an image. (Inherited from BaseInPlaceFilter.)
	Apply(UnmanagedImage)	Apply filter to an image in unmanaged memory. (Inherited from BaseInPlaceFilter.)
	Apply(UnmanagedImage, UnmanagedImage)	Apply filter to an image in unmanaged memory. (Inherited from BaseInPlaceFilter.)
	ApplyInPlace(Bitmap)	Apply filter to an image. (Inherited from BaseInPlaceFilter.)
	ApplyInPlace(BitmapData)	Apply filter to an image. (Inherited from BaseInPlaceFilter.)
	ApplyInPlace(UnmanagedImage)	Apply filter to an unmanaged image. (Inherited from BaseInPlaceFilter.)
	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	Processes the filter. (Overrides BaseInPlaceFilterProcessFilter(UnmanagedImage).)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

Top

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.)

Top

Remarks

In the study of image processing, a watershed is a transformation defined on a grayscale image. The name refers metaphorically to a geological watershed, or drainage divide, which separates adjacent drainage basins. The watershed transformation treats the image it operates upon like a topographic map, with the brightness of each point representing its height, and finds the lines that run along the tops of ridges.

There are different technical definitions of a watershed. In graphs, watershed lines may be defined on the nodes, on the edges, or hybrid lines on both nodes and edges. Watersheds may also be defined in the continuous domain.[1] There are also many different algorithms to compute watersheds. Watershed algorithm is used in image processing primarily for segmentation purposes.

References:

Wikipedia contributors. "Watershed (image processing)." Wikipedia, The Free Encyclopedia. Available on: https://en.wikipedia.org/wiki/Watershed_(image_processing)

Examples

Copy

Bitmap input = ... 

// Apply the transform
var dt = new BinaryWatershed();
Bitmap output = dt.Apply(input);

// Show results on screen
ImageBox.Show("input", input);
ImageBox.Show("output", output);

// Mark points using PointsMarker
var marker = new PointsMarker(Color.Red, 5)
{
    Points = bw.MaxPoints
};

Bitmap marked = marker.Apply(result);
ImageBox.Show("markers", marked);

Reference

Accord.Imaging.Filters Namespace