中文说明：基于信息熵的迭代法求最佳阈值，并附参考论文及KSW熵法求阈值的程序。两个程序经实验测试通过无误。
English Description：
The optimal threshold is obtained by iterative method based on information entropy. The reference paper and the program of KSW entropy method are attached. The two programs passed the experimental test.