US 12,333,761 B2
Camera intrinsic re-calibration in mono visual tracking system
Kai Zhou, Wiener Neudorf (AT)
Assigned to Snap Inc., Santa Monica, CA (US)
Filed by Snap Inc., Santa Monica, CA (US)
Filed on Mar. 19, 2024, as Appl. No. 18/609,845.
Application 18/609,845 is a continuation of application No. 17/528,911, filed on Nov. 17, 2021, granted, now 11,983,897.
Prior Publication US 2024/0221222 A1, Jul. 4, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G06T 7/80 (2017.01); G06T 7/73 (2017.01)
CPC G06T 7/80 (2017.01) [G06T 7/73 (2017.01); G06T 2200/04 (2013.01); G06T 2200/24 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
generating a first image with a camera of a visual tracking system;
in response to generating the first image, detecting that a temperature of the camera exceeds a factory calibration temperature threshold of the camera;
in response to detecting that the temperature of the camera exceeds the factory calibration temperature threshold, generating a second image with the camera being aimed at a peripheral region of the first image; and
determining intrinsic parameters of the camera based on one or more features in a central region of the first image and in the peripheral region of the second image, and one or more projected features in the peripheral region of the second image based on factory intrinsic calibration parameters of the visual tracking system.