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Abstract

A method and system thereof for encoding watermark information such as copyright information within digital data representing, for example, still and video images. A sequence of bits representing the watermark information is mapped into a first plurality of groups such that the first plurality of groups includes more bits than the sequence of bits. The bits from each group of the first plurality of groups are interleaved to form a second plurality of groups. The bits from the second plurality of groups are serialized to form an encoded sequence of bits. Coefficients representing the digital data are modified according to the encoded sequence of bits. In one embodiment, a coefficient is made into an even number when the bit has a first value and the coefficient is made into an odd number when the bit has a second value. In one embodiment, the digital data are in a compressed format (e.g., JPEG or MPEG). The digital data can be subsequently read to retrieve the encoded sequence, and the encoded sequence is then decoded and compared to the original watermark information.

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First Claim