本文对光栅投影条纹图像进行预处理，提出采用重心法提取条纹中心线位置，可以获得亚像素级的精度；
The method of barycenter, which can obtain the sub-pixel accuracy to abstract the fringe-centerlines, is presented in this paper after preprocessing the picture using grating projection.
在水平投影面上，推力杆与车架纵向中心线之间具有夹角。
On the horizontal projection plane, an included Angle is formed between the thrusting bars and the longitudinal center line of the axle.
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