Digital watermarking based on discrete cosine transform optimizing by particle swarm optimization algorithm
Zhang Ren-zh · Jiguang zazhi · 2015
In order to obtain more ideal watermarking effect and improve the security of digital media,aiming at defects of current digital watermarking algorithms,a digital watermarking algorithm is proposed based on discrete cosine transform optimizing by particle swarm optimization algorithm. Firstly,watermark image is scrambled and the discrete cosine transform is used to decompose digital media,secondly,the watermark information is embedded into the coefficients in discrete cosine transform domain which the watermark embedding intensities are determined by using particle swarm optimization algorithm,lastly,the performance is test by simulation experiments. The experimental results show that compared with other digital watermarking algorithms,the proposed watermarking algorithm can not only meet the watermark imperceptibility,and have good robustness against various attacks.