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7 最大熵方法80年代初人们开始考虑用信息论中熵的概念进行阈值选取。1980年Pun首先提出了最大后验熵上限法。两个后验熵定义为H_B~(?)=-P_tlog_2P_t和H_w~(?)=-(1-P_t)log_2(1-P_t),这里P_t=
7 Maximum Entropy Method In the early 1980s, people started to consider the concept of entropy in information theory for threshold selection. Pun first proposed in 1980 the maximum a posteriori entropy ceiling method. The two posterior entropy is defined as H_B ~ (?) = - P_tlog_2P_t and H_w ~ (?) = - (1-P_t) log_2 (1-P_t), where P_t =