Comment by ddetone

The article does not claim that the glasses prevent face detection. It claims that they prevent face recognition. These two concepts are different.

Face detection - determine the location of a face or faces in an image.

Face recognition - given a location of a face in an image, correctly predict who's face it is.

Check out the OpenCV Facial Recognition Tutorial for more info: http://docs.opencv.org/modules/contrib/doc/facerec/facerec_t...