High-resolution compressive 3D imaging through phase ranging with a single-pixel photodetector

Single-pixel three-dimensional (3D) imaging is of great potential to the light detection and ranging (Lidar) system. Combining high-precision ranging with compressed sensing (CS) imaging enables the acquisition of high-resolution and accurate depth maps under non-scanning conditions. In this study, we present that a phase ranging system can be combined perfectly with the CS algorithm perfectly for real 3D imaging through only two reconstructions, along with high accuracy and fast depth measurement. A structured detection architecture based on amplitude-modulated continuous-wave laser illumination and single-pixel detector with high-precision 3D image reconstruction at 128 × 128 resolution using only a 5% sampling rate were used. The minimum identifiable target width of this system is 0.2 cm, corresponding to a resolving angle of 0.33 mrad. This system paves the reality of high-precision and fast 3D imaging for continuous-wave Lidar detections.