Ning Bi Qiyu Sun Daren Huang Zhihua Yang Jiwu Huang Robust Image Watermarking Based on Multiband Wavelets and Empirical Mode Decomposition. 1956-1966 2007 16 IEEE Transactions on Image Processing 8 http://dx.doi.org/10.1109/TIP.2007.901206 db/journals/tip/tip16.html#BiSHYH07