Zhe-Ming Lu Zhen Sun An Image Watermarking Method Based on Mean-Removed Vector Quantization for Multiple Purposes. 558-561 2005 MVA http://b2.cvl.iis.u-tokyo.ac.jp/mva/proceedings/CommemorativeDVD/2005/papers/2005558.pdf conf/mva/2005 db/conf/mva/mva2005.html#LuS05