说明傅里叶频谱面的滤波处理及编码光栅的衍射效率对图象输出信噪比的影响。

This is mainly influenced by the filtering process in Fourier plane and the low diffraction efficiency of the encoding grating.

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实验表明，采用编码光栅投影视觉测量能够高效准确地测量自由曲面的三维轮廓。

Using grating projection and stereo matching based on these constraints, free-form 3-D profiles can be measured efficiently and accurately.

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系统中两块编码光栅用透镜互相成倒像，被测物置于其间并且也用透镜成像于观察屏上。

In the system two coded gratings are inversely imaged to each other by a lens, and the tested phase object is placed between and imaged onto an observation screen.

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