Patent Number: 7,711,143

Title: Methods for marking images

Abstract: An image is marked by making slight changes to pixel values. These changes are essentially imperceptible on human scrutiny, but detectable by computer analysis. Such markings have applications in identifying ownership of images (including video), and also in device control (e.g., triggering a "do not copy" response in suitably configured hardware and software systems).

Inventors: Rhoads; Geoffrey B. (West Linn, OR)

Assignee: Digimarc Corporation

International Classification: H04K 1/00 (20060101)

Expiration Date: 5/04/12018