Saturation-induced phase error correction method in 3-D measurement based on inverted fringes

Saturation-induced phase error in three-dimensional (3-D) measurement is a challenge in fringe projection profilometry. This paper proposed a new, to the best of our knowledge, high dynamic range 3-D measurement method based on inverted fringes. For an efficient phase extraction method based on the 3 f(H) C 2 f(M) C 2 f(L) algorithm, we just need to project a set of inverted fringes. Saturated pixels in the original fringes are replaced with unsaturated pixels in the inverted fringes. We analyzed 72 fringe replacement cases for the 3 f(H) C 2 f(M) C 2 f(L) algorithm and gave the corresponding wrapped phase calculation. Experiments verify the validity of the proposed method. Since the proposed method does not require extensive exposure adjustments and complex projection intensity adjustment, the implementation is simple and convenient. (c) 2023 Optica Publishing Group

Automated summary

This paper proposes a new high dynamic range 3-D measurement method based on inverted fringes to solve the phase error caused by saturation in fringe projection profilometry. By projecting a set of inverted fringes, the efficient phase extraction method using the 3 f(H) C 2 f(M) C 2 f(L) algorithm replaces saturated pixels in the original fringes with unsaturated pixels. Analysis of 72 fringe replacement cases provides corresponding wrapped phase calculation, and experiments verify the validity of the proposed method. The simplicity and convenience of implementation make extensive exposure adjustments and complex projection intensity adjustment unnecessary.