利用边缘提取算法获得像素级条纹后，再利用亚像素技术可以进一步对条纹进行高精度提取。

After getting pixel stripes with edge detection algorithm, the high precision strips could be detected by sub-pixel technology.

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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.

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