Omidi Parsa, Najiminaini Mohamadreza, Diop Mamadou, Carson Jeffrey J L
Opt Express. 2021 Aug 30;29(18):27975-27988. doi: 10.1364/OE.427985.
Phase-shifting profilometry (PSP) is considered to be the most accurate technique for phase retrieval with fringe projection profilometry (FPP) systems. However, PSP requires that multiple phase-shifted fringe patterns be acquired, usually sequentially, which has limited PSP to static or quasi-static imaging. In this paper, we introduce multispectral 4-step phase-shifting FPP that provides 3D imaging using a single acquisition. The method enables real-time profilometry applications. A single frame provides all four phase-shifted fringe patterns needed for the PSP phase retrieval algorithm. The multispectral nature of the system ensures that light does not leak between the spectral bands, which is a common problem in simultaneous phase-shifting with color cameras. With the use of this new concept, custom composite patterns containing multiple patterns can be acquired with a single acquisition.
相移轮廓术（PSP）被认为是条纹投影轮廓术（FPP）系统中用于相位恢复的最精确技术。然而，PSP要求获取多个相移条纹图案，通常是顺序获取，这使得PSP仅限于静态或准静态成像。在本文中，我们介绍了多光谱四步相移FPP，它通过单次采集提供三维成像。该方法能够实现实时轮廓测量应用。单帧提供了PSP相位恢复算法所需的所有四个相移条纹图案。系统的多光谱特性确保了光不会在光谱带之间泄漏，这是彩色相机同时相移时的常见问题。通过使用这一新概念，可以通过单次采集获取包含多个图案的定制复合图案。
