Combining light detection and ranging (LIDAR) with the phase detection auto-focus (PDAF) capabilities of a sensor provides a robust emulation of a document camera on a collaboration endpoint device or system. LIDAR and PDAF can reliably indicate that an object is held close to the camera, PDAF can be used to focus and verify focus, and a snapshot image of the current scene can be sent over a presentation channel.
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Tjontveit, Frode; Hellerud, Erik; Tangeland, Kristian; and Damhaug, Oystein, "LIDAR-ASSISTED AUTO FOCUS TO ENABLE SNAPSHOTS OF CLOSE OBJECTS", Technical Disclosure Commons, (July 01, 2020)