公开(公告)号：US11740076B2

公开(公告)日：2023-08-29

申请号：US17986026

申请日：2022-11-14

Applicant: Guangdong University of Technology

Inventor： Jian Gao ,  Zhuojun Zheng ,  Lanyu Zhang ,  Haixiang Deng

IPC: G01B11/25

CPC classification number: G01B11/2527 ,  G01B11/254

Abstract: This disclosure relates to optical three-dimensional (3D) measurement, and more particularly to a large-depth-range 3D measurement method, system, and device based on phase fusion. Sinusoidal fringes corresponding to multiple high-frequency binary fringe patterns varying in stripe width, a middle-frequency binary fringe pattern, and a low-frequency binary fringe pattern are formed and then projected onto a to-be-measured object. After modulated by height of the object, the sinusoidal fringes are collected, and wrapped phases of the collected sinusoidal fringes are calculated to determine absolute phases of high-frequency sinusoidal fringes. Phase errors of a high-frequency sinusoidal fringe under different fringe widths are calculated according to the defocusing degree. An optimal absolute phase is selected based on the phase errors for the large-depth range 3D measurement.