An error compensation method for 3D measurement of step edge in fringe projection profilometry

Lu Wang; Hongzhi Jiang; Huijie Zhao; Xudong Li; Yuxi Li

doi:10.1117/12.2666745

27 January 2023 An error compensation method for 3D measurement of step edge in fringe projection profilometry

Lu Wang, Hongzhi Jiang, Huijie Zhao, Xudong Li, Yuxi Li

Proceedings Volume 12550, International Conference on Optical and Photonic Engineering (icOPEN 2022); 1255020 (2023) https://doi.org/10.1117/12.2666745
Event: International Conference on Optical and Photonic Engineering (icOPEN 2022), 2022, ONLINE, China

Abstract

Fringe projection profilometry is an efficient, fast and non-contact 3D measurement technique, widely used in industrial parts measurement. However, invalid phases are common when measuring step edges such as holes, ribs and steps in industrial parts which leads to outliers in reconstructed point cloud and ultimately causes reduction of valid point cloud and dimensional measurement errors. In this paper, an error compensation method on 3D measurement of step edge is proposed. 3D measurement space is firstly divided into multiple subspaces based on binocular camera system parameters. Then a calibration method is proposed to calculate the amount of compensation for each subspace and obtain parameters of edge error model. After calibration, point cloud of object with step edge is reconstructed by projecting phase-shifting structured light fringe patterns. By using Principal Component Analysis (PCA), normal estimation of point cloud is implemented. And edge feature is extracted with combination of eigenvalues variation of the covariance matrix and first- and second-order fitting based on two-dimensional projection. At the same time, the corresponding deviation amount of each edge point is solved on the basis of aforementioned edge error model. Finally, the accurate step edge is obtained after error compensation according to the normal direction and deviation amount. Experimental results show that, the method proposed can effectively improve the 3D measurement accuracy of step edge.

Citation Download Citation

Lu Wang, Hongzhi Jiang, Huijie Zhao, Xudong Li, and Yuxi Li "An error compensation method for 3D measurement of step edge in fringe projection profilometry", Proc. SPIE 12550, International Conference on Optical and Photonic Engineering (icOPEN 2022), 1255020 (27 January 2023); https://doi.org/10.1117/12.2666745

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

3D metrology

3D modeling

Point clouds

Error analysis

Cameras

Imaging systems

Phase shifts

Show All Keywords

Keywords/Phrases

Search In:

Publication Years