An SVD-based image watermarking in wavelet domain using SVR and PSO

Authors:
Hung-Hsu Tsai;Yu-Jie Jhuang;Yen-Shou Lai
Affiliations:
Department of Information Management, National Formosa University, Huwei, Yulin 632, Taiwan;Department of Information Management, National Formosa University, Huwei, Yulin 632, Taiwan;Shin-Guang Elementary School, Yulin 646, Taiwan
Venue:
Applied Soft Computing
Year:
2012

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Abstract

The paper presents a novel blind watermarking scheme for image copyright protection, which is developed in the discrete wavelet transform (DWT) and is based on the singular value decomposition (SVD) and the support vector regression (SVR). Its embedding algorithm hides a watermark bit in the low-low (LL) subband of a target non-overlap block of the host image by modifying a coefficient of U component on SVD version of the block. A blind watermark-extraction is designed using a trained SVR to estimate original coefficients. Subsequently, the watermark bit can be computed using the watermarked coefficient and its corresponding estimate coefficient. Additionally, the particle swarm optimization (PSO) is further utilized to optimize the proposed scheme. Experimental results show the proposed scheme possesses significant improvements in both transparency and robustness, and is superior to existing methods under consideration here.