Ask Your Question
0

Classification algorithm in face recognition methods

asked 2016-09-07 22:29:55 -0600

Kelvin gravatar image

I'm using some algorithms (eigenfaces, fisherfaces and LBPH) to perform face recognition using the opencv contrib modules.

Can someone explain to me what internal algorithms these methods use to perform the classification? (for example K-NN, etc)

Note: if it uses K-NN, what is the default value for K?

Thanks

edit retag flag offensive close merge delete
add a comment

1 answer

Sort by ยป oldest newest most voted
2

answered 2016-09-08 00:49:52 -0600

berak gravatar image

all 3 algorithms are using a simple (1) Nearest Neighbour classification, like this:

for each image in trainset:
    if distance between train & test img is the smallest so far:
          keep best id & distance
return best id & distance
edit flag offensive delete link more

Comments

Great. Thanks a lot @berak.

Kelvin gravatar imageKelvin ( 2016-09-09 19:38:30 -0600 )edit

One more thing I forgot to ask. What distance measurement is used? It uses euclidean distance?

Kelvin gravatar imageKelvin ( 2016-10-04 10:35:25 -0600 )edit

yes, exactly.

berak gravatar imageberak ( 2016-10-04 10:39:51 -0600 )edit

Ok, thanks again @berak.

Kelvin gravatar imageKelvin ( 2016-10-04 10:49:34 -0600 )edit
add a comment

Links

Official site

GitHub

Wiki

Documentation

Question Tools

1 follower

subscribe to rss feed

Stats

Asked: 2016-09-07 22:29:55 -0600

Seen: 260 times

Last updated: Sep 08 '16

Related questions

Recognition Confidence

Suitable algorithm for Emotion Detection?

How to get better results with OpenCV face recognition Module

Online Learning and Confidence with cv::FaceRecognizer

FaceRecognizer LBPH update function can't be called

Eigenfaces face recognizer gives error: unresolved external symbols

Classification methods used in OpenCV

I want to implement a FaceRecognizer which just judge the two faces are the same person or not

confidence value and threshold in opencv

Fisherfaces improve classification?

Copyright OpenCV foundation, 2012-2018. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
about | faq | help | privacy policy | terms of service
Powered by Askbot version 0.10.2