Face Detection & Face Recognition using Opencv with C++

asked 2013-05-21 14:19:24 -0600

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My Project is to write a Program that recognize faces with Video Camera and compare the recognized Face if the recognized face in database. If it not in Database send Email.

I read in google the face detection and face recognition from OpenCV.

Face detection and Face recognition: learns a subspace for each person and when i input a new image it measures the distance to all subspaces it has previously learned and chooses the nearest one.

My Question is how can i sort and check that the image is too far from all learned subspaces. Also check the image is the same in the database:

I should realise that with OpenCV.

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answered 2013-05-22 03:11:03 -0600

berak
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the desired threshold value depends on a number of factors:

the algorithm you choose. ( fisher/eigen/lbp FaceRecognizers all have differently sized feature-spaces and use different norms to evaluate the comparison )
your face-db. yes, you need to have it almost complete(say, full), to determine a value, that makes sense.

as for the last topic, how to find if an img is already in the db : this is much easier, it will come out with (almost) zero distance.