US 12,241,977 B1
Passive human detection method and apparatus, device, and medium
Yueting Li, Beijing (CN); Dian Fan, Beijing (CN); Fan Zeng, Beijing (CN); Zhenyu Yang, Beijing (CN); Yi Li, Beijing (CN); and Yangbo Lin, Beijing (CN)
Assigned to Beijing Xsmart Century Technology Co., Ltd., Beijing (CN)
Appl. No. 18/833,386
Filed by Beijing Xsmart Century Technology Co., Ltd., Beijing (CN)
PCT Filed May 22, 2024, PCT No. PCT/CN2024/094611
§ 371(c)(1), (2) Date Jul. 25, 2024,
PCT Pub. No. WO2024/199547, PCT Pub. Date Oct. 3, 2024.
Claims priority of application No. 202310313072.0 (CN), filed on Mar. 28, 2023.
Int. Cl. G01S 17/04 (2020.01); G01J 5/48 (2022.01); G01S 7/48 (2006.01); G01S 17/87 (2020.01); G06V 40/20 (2022.01)
CPC G01S 17/04 (2020.01) [G01J 5/485 (2022.01); G01S 7/4802 (2013.01); G01S 7/4808 (2013.01); G01S 17/87 (2013.01); G06V 40/23 (2022.01)] 16 Claims
OG exemplary drawing
 
1. A passive human detection method, comprising:
acquiring an infrared radiation signal in an environment, and acquiring a temperature of a target object;
emitting an electromagnetic wave into the environment, and acquiring a reflected echo signal;
determining a position of the target object in the environment based on the reflected echo signal;
matching a threshold range based on the position of the target object;
comparing the temperature of the target object with the threshold range to determine detection information of a human in the environment; and
determining a distance between the target object and an infrared radiation signal detection source based on the reflected echo signal, and determining the threshold range through a temperature display range model based on the distance; and adjusting temperature values of upper and lower limits by changing the threshold range based on the distance of the target object, wherein the threshold range matches a temperature display range of the human presented in a thermal image at the distance;
wherein a temperature display range determination model is obtained through training based on temperatures displayed in the thermal image of a plurality of humans at different distances from a thermal imager, and the temperature display range determination model is configured to output the temperature display range of the human at a specific distance based on an input distance.