Image digital watermark algorithm based on BEMD and DCT
Zhao Song-ji · Modern Electronics Technique · 2013
Digital watermark is an efficient method to solve the copyright issue of digital products. The key points of the digital watermark are the invisibility and robustness. An image digital watermark algorithm based on bidimensional empirical mode decomposition(BEMD)and discrete cosine transform(DCT)is proposed to balance the invisibility and robustness. The BEMD of the original image was performed to obtain the corresponding intrinsic mode function(IMF)and a residue. The last one of FMFs given in the first step is transformed according to DCT,and the watermark information is embedded into the intermediate frequency component in DCT domain. The experimental results show that the algorithm has better invisibility and robustness against attacks.