NDLI: Near Optimal Detection of DCT-Domain Watermarks using Alpha-Stable Models

Content Provider	IEEE Xplore Digital Library
Author	Zhongwei Sun Gang Xu
Copyright Year	2006
Description	Author affiliation: Dept. of Inf. Eng., North China Electr. Power Univ., Beijing (Zhongwei Sun; Gang Xu)
Abstract	Digital watermarking can be formulated as a communication task. And the performance of a watermarking scheme relies heavily on the design of the detector. This paper proposes a novel near optimal watermark detector for still images in the discrete cosine transform (DCT) domain. First, the alternative current (AC) DCT coefficients are statistically modeled by symmetric alpha-stable distributions. Then, by resorting to well grounded theoretical results of statistical detection theory, the detector structure in the additive alpha-stable noise interference is derived. Through the approximation to the locally optimum score function, the near optimal detector can be easily implemented. The experimental results demonstrate the superiority of the new detector to correlator detector and generalized Gaussian distribution (GGD) based detector.
Starting Page	1
Ending Page	4
File Size	4232443
Page Count	4
File Format	PDF
ISBN	1424404622
DOI	10.1109/CHINACOM.2006.344880
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-10-25
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Additive noise Data security Watermarking Detectors Gaussian distribution Correlators Probability distribution Discrete cosine transforms Sun Power engineering and energy
Content Type	Text
Resource Type	Article

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