1. A computer-implemented method, the method comprising: generating a first and second images of a face using a camera; generating a first value for one or more facial features of the face by measuring an attribute of the facial features in the first image; generating a second value for the facial features by measuring the same attribute of the facial features in the second image; generating a comparison value for the facial features based on the first value and the second value; comparing the comparison value for the facial features to a predetermined threshold; and based upon comparing the comparison value for the facial features to the predetermined threshold, determining that the face in the first or second images is (i) a picture of a face or (ii) a face of a person actually positioned in front of the camera.