Towards higher-frequency fringe projection profilometry with fewer patterns

Jinghui Zeng, Yucheng Li, Shutao Li, Mingkui Tan

Abstract: Phase unwrapping is crucial in fringe projection profilometry 3D measurement. However, achieving efficient and robust phase unwrapping remains a challenge, particularly when dealing with high-frequency fringes to achieve high accuracy. Existing methods rely on heavy fringe projections, inevitably sacrificing measurement efficiency. To address this problem, we propose a novel phase analysis method based on composite fringe patterns. By embedding a multi-period space-varying phase shift into the phase domain, the noise amplification issues in high-frequency phase unwrapping is effectively addressed. Our proposed method requires fewer patterns than conventional methods, utilizing only four fringe patterns for absolute phase retrieval. Experimental results confirm the feasibility of our proposed method and demonstrate its superior efficiency and accuracy through quantitative comparisons.