Fast Discontinuity-Aware Subpixel Correspondence in Structured Light

Structured light-based 3D scanning presents various challenges. While robustness to indirect illumination has been the subject of recent research, little has been said about discontinuities. This paper proposes a new discontinuity-aware algorithm for estimating structured light correspondences with subpixel accuracy. The algorithm is not only robust to common structured light problems, such as indirect lighting effects, but also identifies discontinuities explicitly. This results in a significant reduction of reconstruction artifacts at objects borders, an omnipresent problem of structured light methods, especially those relying on direct decoding. Our method is faster than previously proposed robust subpixel methods, has been tested on synthetic as well as real data and shows a significant improvement on measurement at discontinuities when compared with other state-of-the-art methods.