High-precision 3D sensors based on multiple infrared speckle projection modules

The 3D measurement technology based on speckle projection has been widely used in emerging fields such as intelligent processing and manufacturing, face recognition. because of its advantages of noncontact and full-field measurement. In this paper, we develop a high-precision 3D sensor system based on multiple infrared speckle projection modules to obtain highly detailed 3D reconstruction data by projecting speckle patterns at different angles. In this system, we design the speckle projection module to encode the depth information of the measured scene by adjusting the laser angle in real time, and then, combine a coarse to fine spatial-temporal stereo matching strategy to improve the accuracy of 3D measurement. Finally, in the 3D measurement experiments of complex multi-object scenes under a large field of view, we verify that the actual measurement results of our system have high-completeness.