Dynamic three-dimensional shape measurement with a complementary phase-coding method

作     者：Wang, Yuwei Liu, Lu Wu, Jun Song, Xiaokai Chen, Xiangcheng Wang, Yajun 

作者机构：Anhui Agr Univ Coll Engn Hefei 230036 Peoples R China Anhui Prov Engn Lab Intelligent Agr Machinery & E Hefei 230036 Peoples R China Wuhan Univ Technol Sch Automat Wuhan 430070 Peoples R China Wuhan Univ State Key Lab Informat Engn Surveying Mapping & R Wuhan 430079 Peoples R China 

出 版 物：《OPTICS AND LASERS IN ENGINEERING》 (工程光学与激光)

年 卷 期：2020年第127卷第0期

页      面：105982-000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：National Natural Science Foundation of China [51905005, 51605130, 61603360] Key University Science Research Project of Anhui Province [KJ2019A0170, KJ2019A0173] Natural Science Foundation of Hubei Province [2018CFB656] 

主　　题：Phase-coding Shape measurement Phase unwrapping Fringe order 

摘      要：The traditional phase-coding (TPC) method has been widely used for three-dimensional (3D) shape measurement. However, the fringe order determined from the coding patterns cannot be precisely aligned with the wrapped phase calculated from the sinusoidal patterns when measuring dynamic objects. Consequently, phase unwrapping errors will occur around the 2 pi phase jumps of the wrapped phase. To address this problem, the present work proposes a complementary phase-coding (CPC) method for dynamic 3D shape measurement. Specifically, the projection of the sinusoidal and coding patterns forms a cycle and the se patterns are shifted by a half-period between even and odd cycles. Combining two fringe orders of adjacent even and odd cycles, the absolute phase map can be correctly recovered. Moreover, to improve the measurement speed, all 8-bit gray patterns are converted into 1-bit binary patterns by a binary dithering technique. Both simulations and experiments demonstrate the robustness and efficiency of the proposed method.