Fig. 1: Principle of the polarization structured light 3D sensor.
From: Polarization structured light 3D depth image sensor for scenes with reflective surfaces
a The model of PSL 3D sensor. In TX, polarized structured light is produced by an HCG-VCSEL array inside. In RX, signals are received selectively by a rotatable polarizer mounted on the receiving infrared CMOS camera. In addition to TX and RX, PSL 3D sensor contains a RGB camera in the middle as well. b The scheme of seeing through the reflective surface. On the upper row, it shows the 3D sensor can obtain depth information of both the reflective surface and the objects behind. On the lower row, the 3D sensor can remove the depth of the reflective surface. The specific steps are shown in the flow diagram. c The scheme of seeing against reflective noise. On the left side, it shows the 3D sensor can obtain the correct depth of the scene by eliminating the effect of reflective noise. The flow of this mission is shown on the right. Note that the plane of the PSL 3D sensor is set to be x-y plane and the light propagation direction is in z direction.
