DIGITAL WATERMARKING USING RANDOM-DOT STEREOGRAMS
Original Publication Date: 1999-Feb-28
Included in the Prior Art Database: 2004-Apr-09
Xerox Disclosure Journal
Disclosed is a method of including hidden information in a halftone image with a stochastic screen. The information is normally invisible, but can be detected when viewing the halftone pattern in detail. This method is based on a random-dot stereogram and when viewed properly, a hidden code or watermark is seen as being offset in depth from the background.