In one embodiment a document authentication station, for use with passports or the like, includes a 2D image sensor (e.g., CCD- or CMOS-based video camera), and a computer device. The image sensor produces produce image data corresponding to a presented document. From this image data, the computer extracts...http://www.google.com/patents/US8126272?utm_source=gb-gplus-sharePatent US8126272 - Methods combining multiple frames of image data
