Dual protection of JPEG images based on informed embedding and two-stage watermark extraction techniques

Wen-Nung Lie; Guo-Shiang Lin; Sheng-Lung Cheng

doi:10.1117/12.632678

24 June 2005 Dual protection of JPEG images based on informed embedding and two-stage watermark extraction techniques

Wen-Nung Lie, Guo-Shiang Lin, Sheng-Lung Cheng

Author Affiliations +

Proceedings Volume 5960, Visual Communications and Image Processing 2005; 59604B (2005) https://doi.org/10.1117/12.632678
Event: Visual Communications and Image Processing 2005, 2005, Beijing, China

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.

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Wen-Nung Lie, Guo-Shiang Lin, and Sheng-Lung Cheng "Dual protection of JPEG images based on informed embedding and two-stage watermark extraction techniques", Proc. SPIE 5960, Visual Communications and Image Processing 2005, 59604B (24 June 2005); https://doi.org/10.1117/12.632678

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KEYWORDS

Digital watermarking

Quantization

Signal detection

Visualization

Image compression

Image quality

Algorithm development

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