区域生长法实现图像分割，获得区域生长起始点，将生长起始点灰度值存入seed中，图像边界上的点的判断，计算新的灰度平均值-Region growing method to achieve image segmentation, region growing starting point to obtain the growth of the gray values ​ ​ are stored in seed starting point, the image point on the boundary of the judgment, to calculate the new average gray