The Fourier transform profilometry as an active optical 3d shape measurement technology has been widely concerned because it need only one deformed grating image to make full-field analysis.
而傅里叶变换轮廓术作为一种主动光学三维形貌测量技术，因其只需要一幅变形光栅图样来做全场分析的优点，而受到人们广泛关注。
A real optical superposition image was formed by dark-adapted crystalline cones for an object at different distances and its size decreased as the object distance increased.
经过暗适应的晶体柱可以对不同物距的目标形成清晰的正重叠像，像的大小随物距的增大而减小；
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