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Fringe Projection Profilometry Based on Saturated Fringe Restoration in High Dynamic Range Scenes

Authors :
Hongru Li
Hao Wei
Jiangtao Liu
Guoliang Deng
Shouhuan Zhou
Wenwu Wang
Liang He
Peng Tian
Source :
Sensors, Vol 23, Iss 6, p 3133 (2023)
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

In high dynamic scenes, fringe projection profilometry (FPP) may encounter fringe saturation, and the phase calculated will also be affected to produce errors. This paper proposes a saturated fringe restoration method to solve this problem, taking the four-step phase shift as an example. Firstly, according to the saturation of the fringe group, the concepts of reliable area, shallow saturated area, and deep saturated area are proposed. Then, the parameter A related to the reflectivity of the object in the reliable area is calculated to interpolate A in the shallow and deep saturated areas. The theoretically shallow and deep saturated areas are not known in actual experiments. However, morphological operations can be used to dilate and erode reliable areas to produce cubic spline interpolation (CSI) areas and biharmonic spline interpolation (BSI) areas, which roughly correspond to shallow and deep saturated areas. After A is restored, it can be used as a known quantity to restore the saturated fringe using the unsaturated fringe in the same position, the remaining unrecoverable part of the fringe can be completed using CSI, and then the same part of the symmetrical fringe can be further restored. To further reduce the influence of nonlinear error, the Hilbert transform is also used in the phase calculation process of the actual experiment. The simulation and experimental results validate that the proposed method can still obtain correct results without adding additional equipment or increasing projection number, which proves the feasibility and robustness of the method.

Details

Language :
English
ISSN :
14248220
Volume :
23
Issue :
6
Database :
Directory of Open Access Journals
Journal :
Sensors
Publication Type :
Academic Journal
Accession number :
edsdoj.7f17be83b6dc4d6bb855274be0388cac
Document Type :
article
Full Text :
https://doi.org/10.3390/s23063133