Real-time 3D shape measurement system with full temporal resolution and spatial resolution

摘要

Numerous fast 3D shape measurement systems based on pattern projection method have been developed in recent years, but measuring arbitrary dynamic 3D shape with full resolution, including temporal resolution and spatial resolution, is still a big challenging problem. This paper presents a real-time 3D measurement system with full spatial resolution and temporal resolution. In this system, three-step phase-shifting algorithm is employed for full spatial resolution measurement, and a multi-view phase-shifting correspondence is used to search the corresponding point independently without additional images. So any adjacent three phase-shifting images in the continuous capturing stream can be used to reconstruct arbitrary 3D shape, the 3D acquisition speed can be as fast as the camera capturing speed to achieve full temporal resolution. Moreover, for developing an accurate measurement system the calibration method is also presented, and it can obtain more accurate internal and external parameters than traditional method in presence of inaccuracy of calibration target. And a hybrid computing architecture based accelerate calculation method is introduced to achieve real-time 3D measurement, and the computation speed can be above 280 times faster than before. The experiments indicate that our system can perform 1024 × 768 full spatial resolution and 220 fps full temporal resolution 3D measurement, and it can also realize real-time 3D measurement at average speed of 50 fps.