一种改进的图像区域中心线提取方法，为了避免出现边界多个1的情况，算法预先扩充边界。-an improved regional image centerline extraction methods, in order to avoid a number of the border, Algorithm advance expand border.

用于对含有较粗光带的图像处理时对光带的中心线进行提取的操作-Used to contain coarse-ray images with optical treatment zone when centerline extraction operation