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Statistical-mechanical approach for multiple watermarks using spectrum spreading

Lecture Notes in Computer Science Volume 5973 Page 231-247
published_at 2010-01
2010010265.pdf
[fulltext] 2.45 MB
Title
Statistical-mechanical approach for multiple watermarks using spectrum spreading
Creators Senda Kazuhiro
Creators Kawamura Masaki
We formulated a Bayes optimum watermarking decoder and derived sub-optimum decoding algorithms for spread spectrum digital image watermarking. The optimum decoder can be obtained by considering the posterior probability under the Gaussian assumption for noise and attacks. The amount of calculation for the decoder is NP-hard. We, therefore, need to derive sub-optimum decoding algorithms in order to decode the watermarks. The proposed decoders are multiple watermark decoders that estimate multiple watermarks at the same time. These methods are based on the multi-stage demodulation method and the partial interference cancellation method, which are two CDMA multiuser demodulation methods. We applied them to the digital watermarking scheme. When the original image is blind, the image itself is regarded as noise. We, therefore, evaluated bit error rates both for cases when the original image is informed and blind. As a result, we found both the multi-stage watermark decoder and the partial interference cancellation decoder were effective for watermarking. The latter performed better than the former.
Languages eng
Resource Type journal article
Publishers Springer
Date Issued 2010-01
Rights
The original publication is available at springerlink.com.()
File Version Author’s Original
Access Rights open access
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[ISSN]0302-9743
info:doi/10.1007/978-3-642-14496-7_18
[ISBN]9783642144967
[isVersionOf] [URI]http://www.springerlink.com/content/0302-9743/
Schools 大学院理工学研究科(理学)