High-speed 3D reconstruction with defocus composite fringes

Fringe projection contouring is a widely used technique in various three-dimensional (3D) reconstruction applications. However, achieving high reconstruction precision typically requires the use of numerous projected patterns, which limits its practicality in dynamic scenes. To address this challenge, we utilized defocused fringes to significantly enhance the projection frame rate of projectors, enabling adaptation to high-speed environments. In this paper, we propose what we believe is a novel method that integrates defocusing technology with composite fringes and an optimization approach for defocusing composite fringes. Notably, our method achieves high-precision 3D reconstruction using only five patterns under slight defocusing. Furthermore, owing to the multifrequency information inherent in composite fringes, each image can be independently utilized for 3D reconstruction, effectively increasing the frame rate of the reconstruction process. The experimental results demonstrate the effectiveness of our method in generating low-bit composite fringes, achieving reconstruction speeds of up to 500 fps. The proven efficacy and efficiency of our approach make it a promising solution for high-speed 3D reconstruction in dynamic environments.