Patent ID: 8886953

Claim:
A method comprising: capturing, by an image capture device of a computing device, a digital authentication image of a face of an authenticating user; generating, by the computing device and based on the digital authentication image, an altered authentication image at least in part by: using, by the computing device, a mathematical model to represent a lens of the image capture device, the mathematical model representing one or more distortions introduced by the lens with respect to digital authentication image; determining, by the computing device and based on the mathematical model, one or more transform functions to correct the one or more distortions introduced with respect to the digital authentication image; and applying the one or more transform functions to the digital authentication image to generate the altered authentication image; presenting the altered authentication image for display; and comparing, by the computing device, the digital authentication image, in an unaltered form, to a digital enrollment image to determine whether to unlock the computing device for use by the authenticating user, wherein the digital enrollment image represents a face of an authorized user of the computing device, and wherein the comparison does not include any correction of the one or more distortions introduced into the digital authentication image.