US 11,808,699 B2
Imaging system
Akihisa Iio, Kanagawa (JP); Takahiro Sato, Kanagawa (JP); Takeaki Itsuji, Kanagawa (JP); and Yasushi Koyama, Kanagawa (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on May 14, 2021, as Appl. No. 17/320,611.
Claims priority of application No. 2020-087431 (JP), filed on May 19, 2020.
Prior Publication US 2021/0364425 A1, Nov. 25, 2021
Int. Cl. G01N 21/35 (2014.01); G01N 21/3581 (2014.01); H04N 5/33 (2023.01)
CPC G01N 21/3581 (2013.01) [H04N 5/33 (2013.01); G01N 2201/06113 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system comprising:
a first lighting device that emits terahertz waves at a first quantity of light emission in a first operation mode, and emits terahertz waves at a second quantity of light emission, which is larger than the first quantity of light emission, in a second operation mode;
a first detection device that detects reflected terahertz waves by a target;
a control device that switches from the first operation mode to the second operation mode in a case where the first detection device detects the target in the first operation mode; and
a second detection device that detects visible light or infrared light,
wherein the control device executes control so as to (1) keep the first lighting device extinguished before the second detection device detects another target, and (2) in a case where the second detection device has detected the another target, switch to the first operation mode, thereby the first lighting device emitting terahertz waves at the first quantity of light emission, and
wherein the another target is a person, and the target is a concealed object carried by the person.