公开(公告)号：US20240411218A1

公开(公告)日：2024-12-12

申请号：US18691430

申请日：2022-09-22

Applicant: Apple Inc.

Inventor： Christian I Moore ,  Ravi Teja Sukhavasi ,  Taufiq Habib ,  Tushar Gupta ,  Zhiheng Jia

IPC: G03B43/00 ,  G02B27/01 ,  G02B27/34 ,  H04N23/55 ,  H04N23/56 ,  H04N23/81

Abstract: Fiducial patterns that produce diffraction patterns at a camera sensor are etched or otherwise provided on the surface of a cover glass (CG) in front of a camera. An active light source injects light into the cover glass or into a diffractive optical element to strengthen the signal from the fiducial pattern, or alternatively an active light source is used to reflect light off a reflective fiducial pattern on the cover glass, thus requiring fewer frames to capture and process the diffraction pattern caused by the fiducial pattern.