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

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

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

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?