说明：  一种二维Otsu快速算法的实现；该算法原文《二维Otsu自适应阑值选取算法的快速实现》发表于自动化学报。
(A two-dimensional Otsu fast algorithm this algorithm original " two-dimensional Otsu adaptive Lanna value selection algorithm for the rapid realization," published in AAS, has been attached to the inner.)