Ultra-low-latency 3D measurement with a 1D approximate de Bruijn pattern.

We proposed an ultra-low-latency projector-camera system for 3D imaging based on the one-dimensional de Bruijn pattern. The feature of this pattern is that four selected different 5-bit de Bruijn sequences form a 7-bit approximate de Bruijn sequence, thus increasing the number of codes while maintaining the short code length, which achieves the balance between precision and decoding speed. The one-dimension property adapts well to GPU acceleration. We measured various moving and deformable objects with different materials, colors, and contrasts, and the results performed very well. For the planar surface, the proposed system acquires 120.0K points per image, and the latency is 0.059 ms with 0.80-mm precision on average.