Spatial image watermarking using spread spectrum modulation
نویسندگان
چکیده
The paper presents low cost spatial image watermarking scheme where inherent anti jamming and interference rejection property of spread spectrum modulation is utilized to provide robustness against image distortions and malicious attempts to remove or tamper with the watermark. The use of error correction code allows a trade-off between degree of robustness and embedding rate for a given attack distortion by adopting greater redundancy in higher order bit planes of the multi valued hidden message. Experimental results show the low bit error probability and high value of mutual information for the decoded message even if the same is extracted from the various degraded version of the watermarked image. Robustness performance is improved further through soft decision decoding.
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