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Features2DToolboxVoteForUniqueness Method
http://www.emgu.com
Filter the matched Features, such that if a match is not unique, it is rejected.

Namespace: Emgu.CV.Features2D
Assembly: Emgu.CV (in Emgu.CV.dll) Version: 3.0.0.2161 (3.0.0.2161)
Syntax
public static void VoteForUniqueness(
	VectorOfVectorOfDMatch matches,
	double uniquenessThreshold,
	Mat mask
)

Parameters

matches
Type: Emgu.CV.UtilVectorOfVectorOfDMatch
Matches. Each matches[i] is k or less matches for the same query descriptor.
uniquenessThreshold
Type: SystemDouble
The distance different ratio which a match is consider unique, a good number will be 0.8
mask
Type: Emgu.CVMat
This is both input and output. This matrix indicates which row is valid for the matches.
See Also