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    INTRINSIC PARAMETERS ESTIMATION IN VISUAL TRACKING SYSTEMS
    6.
    发明申请
    INTRINSIC PARAMETERS ESTIMATION IN VISUAL TRACKING SYSTEMS 有权

    公开(公告)号：US20220375128A1

    公开(公告)日：2022-11-24

    申请号：US17448655

    申请日：2021-09-23

    Applicant: Snap Inc.

    Inventor： Clemens Birklbauer ,  Georg Halmetschlager-Funek ,  Matthias Kalkgruber ,  Kai Zhou

    IPC: G06T7/80 ,  G06K9/46 ,  H04N5/232 ,  H04N17/00

    Abstract: A method for adjusting camera intrinsic parameters of a multi-camera visual tracking device is described. In one aspect, a method for calibrating the multi-camera visual tracking system includes disabling a first camera of the multi-camera visual tracking system while a second camera of the multi-camera visual tracking system is enabled, detecting a first set of features in a first image generated by the first camera after detecting that the temperature of the first camera is within the threshold of the factory calibration temperature of the first camera, and accessing and correcting intrinsic parameters of the second camera based on the projection of the first set of features in the second image and a second set of features in the second image.

    EYEWEAR WITH INTER-PUPILLARY DISTANCE ESTIMATION
    7.
    发明公开
    EYEWEAR WITH INTER-PUPILLARY DISTANCE ESTIMATION 审中-公开

    公开(公告)号：US20240341591A1

    公开(公告)日：2024-10-17

    申请号：US18133870

    申请日：2023-04-12

    Applicant: Snap Inc.

    Inventor： Clemens Birklbauer ,  Matthias Kalkgruber ,  Tiago Miguel Pereira Torres ,  Yubin Xi ,  Kai Zhou

    IPC: A61B3/11

    CPC classification number: A61B3/111

    Abstract: An eyewear device including a sensor used to measure deformation of an eyewear frame to estimate an inter-pupillary distance (IPD) of an eyewear user. The sensor is used to determine head breadth (HB) of the user and to estimate the IPD of the user. A processor displays an image on a display of the eyewear as a function of the estimated IPD to improve virtual object rendering for an improved augmented reality (AR) viewing experience while reducing vergence accommodation mismatch (VAM). User profile data, such as age and gender, can be used to generate a more accurate estimated IPD of the user.

    Rolling shutter camera pipeline exposure timestamp error determination
    8.
    发明授权
    Rolling shutter camera pipeline exposure timestamp error determination 有权

    公开(公告)号：US12108027B2

    公开(公告)日：2024-10-01

    申请号：US18141833

    申请日：2023-05-01

    Applicant: Snap Inc.

    Inventor： Clemens Birklbauer ,  Alexander Kane ,  Dominik Schnitzer

    IPC: H04N17/00 ,  H04N23/56 ,  H04N25/531

    CPC classification number: H04N17/002 ,  H04N23/56 ,  H04N25/531

    Abstract: Camera pipeline exposure timestamp error determination methods and systems that detect latency in rolling shutter camera systems. The exposure timestamp error determination system includes a rolling shutter image sensor configured to capture an image and a processor. The processor determines timestamp error by capturing the image using the rolling shutter image sensor where the image includes a bar code encoded with a barcode timestamp. The processor then obtains a system exposure timestamp corresponding to capture of the image by the rolling shutter image sensor and the barcode timestamp by decoding the bar code. Pipeline exposure timestamp error is then determined for the rolling shutter camera system by comparing the obtained barcode timestamp to the system exposure timestamp.

    FIELD CALIBRATION OF AN AUGMENTED REALITY DEVICE
    10.
    发明申请
    FIELD CALIBRATION OF AN AUGMENTED REALITY DEVICE 有权

    公开(公告)号：US20250109966A1

    公开(公告)日：2025-04-03

    申请号：US18477297

    申请日：2023-09-28

    Applicant: Snap Inc.

    Inventor： Clemens Birklbauer ,  Georg Halmetschlager-Funek ,  Matthias Kalkgruber ,  Tiago Miguel Pereira Torres ,  Simon Schreiberhuber

    IPC: G01C25/00 ,  G01C21/00 ,  G01C21/16 ,  G06T19/00

    Abstract: A method for recalibrating an augmented reality (AR) device includes generating and storing a ground truth map of a real-world environment when the AR device is operating with a high likelihood of having an accurate factory calibration. During operation of the AR device, new map data is generated for the real-world environment. The new map data is compared to the ground truth map to detect potential calibration errors. If calibration errors are detected, a recalibration procedure is executed by determining an optimal path through the real-world environment that allows for observing parameters requiring recalibration. Visual cues are generated to guide a user of the AR device through the optimal path. As the user follows the visual cues, calibration parameters are iteratively adjusted to eliminate detected calibration errors. The recalibration procedure may be presented as an interactive game to improve user engagement, with rewards provided for accurately following guidance.

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