说明：  otsu对苹果进行自适应阈值分割，首先将彩色图像灰度化，然后在获取阈值，进行图像分割，显示结果。本实验中自己的MATLAB中运行能有结果才上传的。
(Otsu carries out adaptive threshold segmentation for apples. Firstly, the color image is grayed, then the threshold is obtained, the image is segmented and the results are displayed. In this experiment, the results can be uploaded only when running in our own MATLAB.)