SENSING DATA FROM PHYSICAL OBJECTS

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 computer readable medium containing non-transitory instructions for causing a process programmed thereby to perform the following acts:
capture image data representing an article; process the captured image data to derive first data and second data; determine a correlation between the first data and the second data; generate an output comprising plural output components when the determined correlation exceeds a threshold, wherein the plural output components are dependent on the first data and second data; and render the output to user.