Watermark embedding and extraction method and apparatus in...

Details Watermark embedding and extraction method and apparatus in... Watermark embedding and extraction method and apparatus in...

2007-08-07

2007-08-07

Sherali, Ishrat (Department: 2624)

Image analysis

Applications

C382S244000

Reexamination Certificate

active

10632710

ABSTRACT:
A method and apparatus embeds and extracts a watermark bit-sequence in a data stream of symbols compressed using dictionary-based compression scheme with variable length indices. The embedding transmits an index value from a set of m-bit index values used to compress symbols in the data stream, identifies divisions and unused bits in the set of m-bit index values, determines a watermark bit value as either a zero-bit value or a one-bit value, transmits the index value in a one-bit watermark value range when the watermark bit value is determined to be a one-bit value and transmits the index value in a zero-bit watermark value range when the watermark bit value is determined to be a zero-bit value. Extracting the watermark reverses these operations and classifies the indices as being in either the zero-bit watermark value range or the one-bit watermark value range until the watermark is recreated.

REFERENCES:
patent: 6950519 (2005-09-01), Rhoads
patent: 7187780 (2007-03-01), Tian et al.

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