G. Y. Yang Huazhong Shu Christine Toumoulin Guoniu Han Limin Luo Efficient Legendre moment computation for grey level images. 74-80 2006 39 Pattern Recognition 1 http://dx.doi.org/10.1016/j.patcog.2005.08.008 db/journals/pr/pr39.html#YangSTHL06