Mr. Jun-Horng Chen Profile

Jun-Horng Chen

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Proceedings Article | 29 April 2002 Paper

Improved watermarking scheme by reference signal mingling

Soo-Chang Pei, Jun-Horng Chen

Proceedings Volume 4675, (2002) https://doi.org/10.1117/12.465303

KEYWORDS: Digital watermarking, Image compression, Quantization, Image quality, Receivers, Signal processing, Signal detection, Image processing, Telecommunications, Error analysis

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Various watermarking schemes were developed in an attempt to address the piracy issue. One of the most important requisites for an effective watermarking scheme is its robustness. A robust watermarking scheme means the embedded watermark can still be extracted successfully from an attacked watermarked data. Regardless of the motivations, the attacked watermarked data should have an acceptable quality, that is, an attacker can't remove the embedded watermark without penalty. In this paper, we propose the robustness can be improved by mingling a reference signal during watermark embedding. The knowledge of reference signal at receiver end makes better channel estimation and lower probability of detection error. To show the performance improved by mingling reference watermark, we applied it to quantization-based image watermarking in discrete cosine transform (DCT) domain and watermarked image was attacked by JPEG compression. The simulation results will show mingling reference signals really achieved better performance. Having the same quality of attacked watermarked image, probability of error with reference signals mingling could be lower than without it.

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