How is threshold value set in PCA ? Alternatively how to increase efficiency of PCA?

asked 2014-06-06 01:12:39 -0600

AEFGR gravatar image

updated 2014-06-06 01:54:02 -0600

berak gravatar image

We are implementing a face detection-recognition,gender recognition. We are using PCA for detection of human face in images. Please tell us how to decide a threshold value for the PCA algorithm. Also any alternatively methods , how to increase efficiency of PCA?

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no silver bullet here, you will have to run tests on your own data.

the predict method returns a 'confidence' value, that's actually the distance to the closest item in your trainset. a possible threshold value for rejection will be somewhere between the largest true and the smallest false recognition result

berak gravatar imageberak ( 2014-06-06 01:51:36 -0600 )edit