Object processing employing movement

摘要

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 can be performed through us of a handheld optical device, such as a camera-equipped cell phone. The albedo function can serve as random key data in a variety of cryptographic applications. The function can be changed during the life of the article. A variety of other features are also detailed.

主权项

1. A method comprising:
capturing plural successive images of an object from different viewpoints using a camera-equipped device, said capturing occurring during relative movement between the device and the object; and by reference to data thereby collected, making a determination concerning the object, based on 2D directional albedo data obtained by processing said plural successive images from different viewpoints, wherein said determination is made independently of information about positioning of any illumination source relative to the object.