Abstract
A system for tracking and tracing secure documents is described by embedding print job data on each page in a steganographic halftone, preserving the aesthetics of the page. The system demonstrates the ability to transmit job tracking data with perfect accuracy using data hidden in a high-quality rendering of a graphics object. This work addresses two key issues: (1) control of halftoning edge eflects for graphic objects like logos, and (2) compensation for non-afline warping efiects induced by the print-scan process. The solution eliminates noisy edges without sacrificing data-carrying capacity in natural images, while providing automated alignment and robust recovery with the use of error correction codes.
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