Methods for embedding and reading auxiliary messages from image signals use embedded code signals modulated with the auxiliary message. These embedded ode signals may be used to convey hidden tracking codes in images, video and printed objects. The embedded code signals are embedded by varying characteristics of the image signal, including, for example, gray-level, reflective properties, photo-reactive properties, etc.

 
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> Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data

> Methods for embedding image, audio and video watermarks in digital data
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