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measure_lib
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measure_lib/readme.txt

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函数说明：vs_measurement(txt_name, position )
txt_name：路沿数据文件路径
position：车上某点P与摄像头在X轴（行驶方向）上的偏移量，车头为正，车位为负。
若不输入该参数默认为900，指向前车轮中心位置。
返回值 state ， Zw_pos, distance_pos
state为-1：txt_name所传输的数据无法使用或数据为空
state为0：文件路径不存在
以上两种Zw_pos, distance_pos都为none
state = 1 ：
Zw_pos返回P点或者默认点对应路沿的高度值
distance_pos返回P点或者默认点与路沿的距离