利用K均值进行图像分割，无需利用“苹果为红色”这个先验知识，而只需利用图像本身的特征——前景与背景区别较明显-The use of K-means image segmentation, without the use of " red apple"　This a priori knowledge, and simply use the characteristics of the image itself- the more obvious differences between the foreground and background