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You can check this paper: http://research.microsoft.com/en-us/um/people/zhang/Papers/PAMI%20-%20Eyeglasses%20Removal.pdf They do detection and automatic removal, it may be useful.
They say:
Central to our system is a sample-based approach that learns the statistical mapping between face images with eyeglasses and their counterparts without eyeglasses. From a number of training pairs of face images with and without eyeglasses, we model their joint distribution effectively in an eigenspace spanned by all training pairs. With the learned joint distribution, given a face image with eyeglasses, we can obtain in closed form its corresponding face image without eyeglasses.
Thus, this approach would require a training database.
