Directional albedo of a particular article, such as an identity card, is measured and stored. When the article is later presented, it can be confirmed to be the same particular article by re-measuring the albedo function, and checking for correspondence against the earlier-stored data. The re-measuring...http://www.google.com.au/patents/US8126203?utm_source=gb-gplus-sharePatent US8126203 - Object processing employing movement
