Phase-stepped fringe projection by rotation about the camera's perspective center

作     者：Huddart, Y. R. Valera, J. D. Weston, N. J. Featherstone, T. C. Moore, A. J. 

作者机构：Renishaw Plc Edinburgh EH14 4AP Midlothian Scotland Heriot Watt Univ Sch Engn & Phys Sci Edinburgh EH14 4AS Midlothian Scotland 

出 版 物：《OPTICS EXPRESS》 (Opt. Express)

年 卷 期：2011年第19卷第19期

页      面：18458-18469页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：Engineering and Physical Sciences Research Council [GR/T11289/01, GR/S12395/01] AWE 

主　　题：Fringe projection Image processing algorithms Optical measurement Phase measurement Precision metrology Speckle noise 

摘      要：A technique to produce phase steps in a fringe projection system for shape measurement is presented. Phase steps are produced by introducing relative rotation between the object and the fringe projection probe ( comprising a projector and camera) about the camera s perspective center. Relative motion of the object in the camera image can be compensated, because it is independent of the distance of the object from the camera, whilst the phase of the projected fringes is stepped due to the motion of the projector with respect to the object. The technique was validated with a static fringe projection system by moving an object on a coordinate measuring machine (CMM). The alternative approach, of rotating a lightweight and robust CMM-mounted fringe projection probe, is discussed. An experimental accuracy of approximately 1.5% of the projected fringe pitch was achieved, limited by the standard phase-stepping algorithms used rather than by the accuracy of the phase steps produced by the new technique. (C) 2011 Optical Society of America