An Improved Blind Watermarking Scheme in Wavelet Domain
Hai Tao, Jasni Mohamad Zain, Ahmed N. Abd Alla, Wang Jing
International Journal of Web Applications, Vol. 2, No. 4, 2010.
DOI: 
Link: http://www.dline.info/ijwa/fulltext/v2n4/2.pdf
Abstract:
&#65279;ABSTRACT: The trade-off between the imperceptibility and robustness is one of the most challenges in digital watermarking 	  system. To solve the problem, this paper proposes an improved blind digital watermarking algorithm for images based on 	  the combination of Discrete Wavelet Transform (DWT) decomposition and Particle Swarm Optimization (PSO). For 	  protecting the copyright information of a digital image, the watermark preprocessed with an affine scrambling is embedded 	  in the vertical subband ( ) coefficients in wavelet domain. Furthermore, the proposed algorithm based on PSO is 	  performed to train scaling factors to accomplish maximum the watermark strength while decrease the visual distortion. 	  Simulation results demonstrate the proposed watermarking procedure has the remarkable performance in robustness to 	  various attacks and the superiority of the proposed scheme.