US 11,798,188 B2
Apparatus and method of remotely measuring size of pupil
Zhiqiang Chen, Beijing (CN); Yuanjing Li, Beijing (CN); Jianmin Li, Beijing (CN); Xianghao Wu, Beijing (CN); Bin Liu, Beijing (CN); and Guocheng An, Beijing (CN)
Assigned to Tsinghua University, Beijing (CN); and Nuctech Company Limited, Beijing (CN)
Appl. No. 17/622,496
Filed by Tsinghua University, Beijing (CN); and Nuctech Company Limited, Beijing (CN)
PCT Filed Feb. 24, 2021, PCT No. PCT/CN2021/077606
§ 371(c)(1), (2) Date Dec. 23, 2021,
PCT Pub. No. WO2021/196924, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 202010247940.6 (CN), filed on Mar. 31, 2020.
Prior Publication US 2022/0245807 A1, Aug. 4, 2022
Int. Cl. G06V 40/18 (2022.01); G06T 7/62 (2017.01); G06T 7/90 (2017.01); G06T 7/70 (2017.01); G06V 40/16 (2022.01); G06T 7/00 (2017.01)
CPC G06T 7/62 (2017.01) [G06T 7/0012 (2013.01); G06T 7/70 (2017.01); G06T 7/90 (2017.01); G06V 40/162 (2022.01); G06V 40/18 (2022.01); G06V 40/193 (2022.01); G06T 2207/30041 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method of determining whether a person has taken drugs, comprising:
acquiring an image of a person using a detection device;
acquiring an image of a pupil of the person from the image of the person;
measuring a distance between the person and the detection device using the detection device;
calculating an actual size of the pupil of the person based on the measured distance and a size of pixels occupied by the image of the pupil of the person in the image of the person;
measuring a body temperature of the person by using the detector; and
determining whether the person has taken drugs based on the actual size of the pupil of the person and the body temperature of the person.