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.

公开(公告)号：US20240095958A1

公开(公告)日：2024-03-21

申请号：US18466379

申请日：2023-09-13

Applicant: Apple Inc.

Inventor： Shuntaro Yamazaki ,  Ravi Teja Sukhavasi ,  Oleg Naroditsky ,  Stergios Roumeliotis ,  Daniel C Byrnes

IPC: G06T7/80 ,  G06T7/00 ,  G06T7/20 ,  G06V10/74 ,  H04N23/695

CPC classification number: G06T7/80 ,  G06T7/0002 ,  G06T7/20 ,  G06V10/761 ,  H04N23/695 ,  G06T2207/30168 ,  G06V2201/07

Abstract: Methods for performing a calibration process for outward-facing cameras on devices such as head-mounted display devices are disclosed. Extrinsic parameters of the camera are first estimated using inputs to the calibration process such as information from an inertial measurement unit and points of interest within images captured by the camera that are tracked with time. Then, extrinsic and intrinsic parameters are concurrently determined in an optimization problem such that updated values of said parameters may be stored and used by applications that run on the device and make use of the camera. The calibration process may be extended to concurrently calibrate multiple cameras based, at least in part, on information from the inertial measurement unit that is local to the camera.