By searching the catastrophe point of direction projection values sequence of freeway scene binarization image, the traffic sign region position was located correctly.

• 利用场景二值化图像形状特征（周长、形状参数、圆形性参数）去除非目标区域，并通过搜索场景二值化图像方向投影值序列的突变点实现标志准确定位。