Importance

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Abstract

A method and system thereof for encoding and embedding information within digital data representing, for example, audio data, image data, and video data. The information is represented by a plurality of bits which are separated into a group of input bits and a group of pointer bits. One or more output bits are generated from an input bit using a convolutional code. A sequence of bits is selected using a pointer bit and the output bit(s). The information is encoded and embedded into the digital data by modifying coefficients of the digital data according to the sequence of bits selected. Each bit of the sequence of bits selected is used to modify a respective coefficient. 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. The digital data can be subsequently read to retrieve the embedded and encoded data, and the encoded sequence is then decoded and compared to the original watermark information.

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First Claim