说明：  对多种常用的图像分割算法进行对比，并采用像素精度（PA）、均像素精度（MPA）、均交并比（MIoU）、频权交并比（FWIoU）四个评价因子对各算法的分割效果进行评定，值越大说明分割效果越好
(Several commonly used image segmentation algorithms are compared. Four evaluation factors, namely, pixel accuracy (PA), average pixel accuracy (MPA), average intersection-parallel ratio (MIoU), frequency-weighted intersection-parallel ratio (FWIoU), are used to evaluate the segmentation effect of each algorithm. The larger the value, the better the segmentation effect.)