图像膨胀是根据条件把图像众当前点的颜色赋给周围点,或者把周围点的颜色赋给当前点,最终使物体显得更加平整,更加明显.此代码以weiman的算法思路编制.-Image expansion is based on the conditions of the public image of the color assigned to the current point around the point, or the color of the surrounding points assigned to