Fig. 1. Diagram of the hardware structure of the 3D structured-light sensor based on VCSEL projection array

Fig. 2. Diagram of a coarse-to-fine spatial-temporal speckle correlation algorithm

Fig. 3. Cost calculation method based on mutual information

Fig. 4. Single-pixel temporal matching method based on normalised mutual information

Fig. 5. Histogram of difference before and after interpolation using different interpolation functions. (a) Linear interpolation function; (b) parabolic interpolation function; (c) fused interpolation function

Fig. 6. 3D point cloud results using different interpolation functions. (a) Linear interpolation function; (b) parabolic interpolation function; (c) fused interpolation function

Fig. 7. Precision analysis result. (a) Measurement error curves at different distances; (b) point cloud results of the plane at 100 cm; (c) error histograms of the plane at 100 cm

Fig. 8. 3D measurement results of the human head model

Fig. 9. 3D measurement results of the David model

Fig. 10. Measurement error between the 3D point cloud output by different devices and the standard data

Fig. 11. Long-distance measurement experiment of metal parts. (a)-(c) Speckle images of metal screws stacked in different postures; (d)-(f) corresponding 3D point cloud results

Fig. 12. 3D measurement results for complex scene