·  3D structured light usually includes VCSEL, optical diffraction element (DOE), infrared camera, image processing chip and other core devices.
·  After the beam emitted by the VCSEL laser passes through the collimator, the laser speckle is obtained by the DOE device and then the optical grating is used to "diffract copy" to expand the casting angle and project a series of specific pattern combinations to the target object. These spots are invisible to the human eye, but can be captured by infrared cameras. Based on the principle of triangulation, three-dimensional reconstruction is rebuilt by the deformation of reflected light spots.
·  Compared with other 3D recognition schemes such as TOF and binocular, structured light has high precision and low power consumption, which is especially suitable for applications such as unlocking, payment, and modeling.