First, grating is projected on measured free surface, and height data of each point on free surface is measured by the grating projection method.
首先将矩形光栅投影在被测表面上，利用光栅投影法测量自由曲面上每点高度信息。
Differing from the traditional optical measuring method, the measuring system USES two CCD cameras to record projection grating, thus reduces errors and improves measuring accuracy.
与传统的光学测量方法不同，测量系统采用两个CCD相机记录投影光栅，减小了测量误差，提高了测量精度。
Projection grating measuring technique, which records the measurement results with binocular CCD camera, is a new optical measuring method.
利用双目CCD相机记录的光栅投影测量技术是一种新型的光学测量方法。
The cosine grating is taken as the projected grating and the referenced grating; the projection moire method is analyzed by the physical optics.
以余弦光栅作为投影光栅和参考光栅，对投影型莫尔法从物理光学的角度进行了理论分析。
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.
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 sub-pixel accuracy in abstracting the fringe-centerlines can be obtained by the method of barycenter after preprocessing the fringe picture using grating projection.
精确地获得光栅条纹中心线的相对偏移量，在三角形法测量物体三维轮廓技术中占有非常重要的地位。
The sub-pixel accuracy in abstracting the fringe-centerlines can be obtained by the method of barycenter after preprocessing the fringe picture using grating projection.
精确地获得光栅条纹中心线的相对偏移量，在三角形法测量物体三维轮廓技术中占有非常重要的地位。
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