US 12,304,471 B2
Method for visually tracking gaze point of human eye, vehicle early warning method and device
Jin Zhang, Guangzhou (CN); Zhijun Cai, Guangzhou (CN); and Ying Zhang, Guangzhou (CN)
Assigned to GUANGZHOU AUTOMOBILE GROUP CO., LTD., Guangzhou (CN)
Appl. No. 17/908,128
Filed by GUANGZHOU AUTOMOBILE GROUP CO., LTD., Guangzhou (CN)
PCT Filed Jun. 4, 2021, PCT No. PCT/CN2021/098341
§ 371(c)(1), (2) Date Aug. 30, 2022,
PCT Pub. No. WO2021/249300, PCT Pub. Date Dec. 16, 2021.
Claims priority of application No. 202010528103.0 (CN), filed on Jun. 11, 2020.
Prior Publication US 2023/0025540 A1, Jan. 26, 2023
Int. Cl. B60W 30/095 (2012.01); B60W 40/08 (2012.01); B60W 50/14 (2020.01)
CPC B60W 30/095 (2013.01) [B60W 40/08 (2013.01); B60W 50/14 (2013.01); B60W 2040/0827 (2013.01); B60W 2050/143 (2013.01); B60W 2540/225 (2020.02)] 20 Claims
OG exemplary drawing
 
1. A method for visually tracking a gaze point of a human eye, which is applied in a host vehicle, comprising:
in response that a match between the host vehicle and a visual tracking device is established, the host vehicle calculating a distance between a centroid of the host vehicle and the visual tracking device;
in response that the distance is determined to be less than or equal to a preset distance, the host vehicle periodically receiving position coordinates of a human eye of a driver of the host vehicle and coordinates of a gaze point of a sightline of the human eye on an inner side of a current projection screen, provided by the visual tracking device; wherein, the current projection screen is a windshield or a front window of the host vehicle; and
the host vehicle screening out a refractive index and a curvature of the current projection screen, and combining with the position coordinates of the human eye and the coordinates of the gaze point of the sightline on the inner side of the current projection screen, obtaining coordinates of a gaze point of the sightline on an outer side of the current projection screen and a corresponding refracted light path formed by outward refraction of a sightline, and further combining with a preset normal viewing distance of the human eye, obtaining a final gaze point of a sightline on the corresponding refracted light path and coordinates of the final gaze point.