Zhihua Yang Lihua Yang Dongxu Qi Ching Y. Suen An EMD-based recognition method for Chinese fonts and styles. 1692-1701 2006 27 Pattern Recognition Letters 14 http://dx.doi.org/10.1016/j.patrec.2006.03.002 db/journals/prl/prl27.html#YangYQS06