假设一幅图像的灰度级为L，其邻域平滑图像的灰度级也为L，对于图像中的任何一个像素，就有了一个二元组。对于系图像进行处理就构成了2维0tsu的分割。-Assuming that the gray level of an image is L and the gray level of its neighborhood smoothing image is L, for any pixel in the image, there will be a two-tuple. The processing