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Proceedings Paper

Dual protection of JPEG images based on informed embedding and two-stage watermark extraction techniques
Author(s): Wen-Nung Lie; Guo-Shiang Lin; Sheng-Lung Cheng
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Paper Abstract

A watermarking scheme, proposed to embed both image-dependent and fixed-part marks for dual protection (content authentication and copyright claim) of JPEG images, is described in this paper. To achieve the goals of efficiency, imperceptibility, and robustness, a compressed-domain informed embedding algorithm, which adopts Lagrangian multiplier optimization approach followed by an iterative refinement procedure, is developed. To robustly detect the fixed-part watermark, a two-stage watermark extraction procedure is devised. At the first stage, the semi-fragile watermark in each channel is extracted for content authentication. At the second stage, a weighted soft-decision decoder, in which the signal detected in each channel is weighted according to the estimated channel condition, is used to raise the recovery rate of the fixed-part watermark for copyright protection. Experimental results manifest that the proposed scheme can not only achieve the purposes of content authentication (semi-fragile watermarks to resist mild image alterations and detect malicious tampered regions) and copyright protection (robust watermarks to claim the ownership), but also maintain higher visual quality (by at least 4 dB than the prior method) at a specified watermark robustness.

Paper Details

Date Published: 24 June 2005
PDF: 12 pages
Proc. SPIE 5960, Visual Communications and Image Processing 2005, 59604B (24 June 2005); doi: 10.1117/12.632678
Show Author Affiliations
Wen-Nung Lie, National Chung Cheng Univ. (Taiwan)
Guo-Shiang Lin, National Chung Cheng Univ. (Taiwan)
Sheng-Lung Cheng, National Chung Cheng Univ. (Taiwan)

Published in SPIE Proceedings Vol. 5960:
Visual Communications and Image Processing 2005
Shipeng Li; Fernando Pereira; Heung-Yeung Shum; Andrew G. Tescher, Editor(s)

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