Dynamic 3-D measurement based on fringe-to-fringe transformation using deep learning HAOTIAN YU,1,2,3 XIAOYU CHEN,1,2,3 ZHAO ZHANG,1,2 YI ZHANG,1,2 DONGLIANG ZHENG,1,4 AND JING HAN,1,2,5 1 School of Electronic and Optical Engineering, Nanjing University of Science and Technology, No. 200 Xiaolingwei Street, Nanjing, Jiangsu Province 210094, China 2 Jiangsu Key Laboratory of Spectral Imaging and Intelligent Sense, Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210094, China 3Co-first authors with equal contribution 4
[email protected] 5
[email protected] Abstract: Fringe projection profilometry (FPP) has become increasingly important in dynamic 3-D shape measurement. In FPP, it is necessary to retrieve the phase of the measured object before shape profiling. However, traditional phase retrieval techniques often require a large number of fringes, which may generate motion-induced error for dynamic objects. In this paper, a novel phase retrieval technique based on deep learning is proposed, which uses an end-to-end deep convolution neural network to transform a single or two fringes into the phase retrieval required fringes. When the object’s surface is located in a restricted depth, the presented network only requires a single fringe as the input, which otherwise requires two fringes in an unrestricted depth. The proposed phase retrieval technique is first theoretically analyzed, and then numerically and experimentally verified on its applicability for dynamic 3-D measurement. 1. Introduction Dynamic three-dimensional (3-D) has been widely used in applications, such as bio-medicine [1],reverse engineering [2], and face recognition [3], etc.