Open AccessLarge depth-of-field three-dimensional shape measurement with the focal sweep technique
Author(s) -
Xiaowei Hu,
Song Zhang,
Yujin Zhang,
Yongpan Liu,
Guijin Wang
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.404260
Subject(s) - optics , deconvolution , cardinal point , depth of field , lens (geology) , computer science , focal length , projection (relational algebra) , iterative reconstruction , field (mathematics) , computer vision , artificial intelligence , algorithm , physics , mathematics , pure mathematics
Three-dimensional (3D) shape measurement based on the fringe projection technique has been extensively used for scientific discoveries and industrial practices. Yet, one of the most challenging issues is its limited depth of field (DOF). This paper presents a method to drastically increase DOF of 3D shape measurement technique by employing the focal sweep method. The proposed method employs an electrically tunable lens (ETL) to rapidly sweep the focal plane during image integration and the post deconvolution algorithm to reconstruct focused images for 3D reconstruction. Experimental results demonstrated that our proposed method can achieve high-resolution and high-accuracy 3D shape measurement with greatly improved DOF in real time.