说明：  根据《基于信息熵的图像分割阈值迭代改进算法》论文实现的一个小函数，函数功能是实现目标图像与背景图像的分割，能够提取出感兴趣图像的位置和边缘信息,重要部分有注释
(Based on the " threshold of image segmentation based on information entropy iterative improvement algorithms papers to achieve a small function function function is to achieve the target image and the background image segmentation, interested in the position of the image and edge information can be extracted)