Class BackgroundSubtractorKNN

K nearest neigbours algorithm

public class BackgroundSubtractorKNN : BackgroundSubtractor, IDisposable

Inheritance: object

CvObject

CvPtrObject

Algorithm

BackgroundSubtractor

BackgroundSubtractorKNN

Inherited Members: BackgroundSubtractor.Apply(InputArray, OutputArray, double)

BackgroundSubtractor.Apply(InputArray, InputArray, OutputArray, double)

BackgroundSubtractor.GetBackgroundImage(OutputArray)

Algorithm.Write(FileStorage)

Algorithm.Read(FileNode)

Algorithm.Empty

Algorithm.Save(string)

Algorithm.GetDefaultName()

CvPtrObject.RawPtr

CvObject.IsDisposed

CvObject.ptr

CvObject.SetSafeHandle(OpenCvSafeHandle)

CvObject.SetPostReleaseAction(Action)

CvObject.Dispose()

CvObject.Dispose(bool)

CvObject.DisposeManaged()

CvObject.DisposeUnmanaged()

CvObject.ThrowIfDisposed()

CvObject.CvPtr

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Properties

DetectShadows: Returns the shadow detection flag. If true, the algorithm detects shadows and marks them. See createBackgroundSubtractorKNN for details.

Dist2Threshold: Gets or sets the threshold on the squared distance between the pixel and the sample. The threshold on the squared distance between the pixel and the sample to decide whether a pixel is close to a data sample.

History: Gets or sets the number of last frames that affect the background model.

KNNSamples: Returns the number of neighbours, the k in the kNN. K is the number of samples that need to be within dist2Threshold in order to decide that that pixel is matching the kNN background model.

ShadowThreshold: Gets or sets the shadow threshold. A shadow is detected if pixel is a darker version of the background. The shadow threshold (Tau in the paper) is a threshold defining how much darker the shadow can be. Tau= 0.5 means that if a pixel is more than twice darker then it is not shadow. See Prati, Mikic, Trivedi and Cucchiara, Detecting Moving Shadows..., IEEE PAMI,2003.

ShadowValue: Gets or sets the shadow value. Shadow value is the value used to mark shadows in the foreground mask. Default value is 127. Value 0 in the mask always means background, 255 means foreground.