说明：  道路图片处理方法：最大类间方差的求解过程，就是在解空间中查找到一个最优的解，使得其方差最大，而遗传算法能非线性快速查找最优解k及最大的方差。
(The largest between-class variance method,The larger the variance between the background and the target,the greater the difference between the two parts that make up the image.)