Phen-Lan Lin Chung-Kai Hsieh Po-Whei Huang A hierarchical digital watermarking method for image tamper detection and recovery. 2519-2529 2005 38 Pattern Recognit. 12 https://doi.org/10.1016/j.patcog.2005.02.007 db/journals/pr/pr38.html#LinHH05