Depth Image Acquisition

The general imaging method obtains a 2D image originating from a 3D physical space, in which the information on the plane perpendicular to the optical axis of the camera is preserved in this 2D image, but the depth (distance) information along the optical axis of the camera is lost. To complete visual tasks, computer vision often needs to obtain 3D information of the objective world; that is, it needs to collect images with depth information.