US 12,254,695 B2
Foreign matter detection system
Kenichi Hamaguchi, Tokyo (JP); Hiroaki Imaizumi, Tokyo (JP); Jingyu Hu, Tokyo (JP); Takanori Nishimura, Tokyo (JP); and Kenichi Nakamura, Tokyo (JP)
Assigned to IHI Corporation, Tokyo (JP)
Filed by IHI CORPORATION, Tokyo (JP)
Filed on Nov. 17, 2021, as Appl. No. 17/528,850.
Application 17/528,850 is a continuation of application No. PCT/JP2020/015074, filed on Apr. 1, 2020.
Claims priority of application No. 2019-094737 (JP), filed on May 20, 2019.
Prior Publication US 2022/0076029 A1, Mar. 10, 2022
Int. Cl. H04N 7/18 (2006.01); G06V 10/147 (2022.01); G06V 20/52 (2022.01); G08B 21/18 (2006.01)
CPC G06V 20/52 (2022.01) [G06V 10/147 (2022.01); G08B 21/18 (2013.01); H04N 7/183 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A foreign matter detection system comprising
a first and image capturing device for acquiring a first image in a target area, wherein the first image capturing device has a first field of view,
a second image capturing device for acquiring a second image in the target area, wherein the second image capturing device has a second field of view, wherein the second field of view is different than the first field of view,
a transmission part arranged within the first and second fields of view of the first and second capturing devices, and through the transmission part a space outside of the target area can be visually observed from inside of the target area,
an entry/exit port for entering/exiting the target area, the entry/exit port being arranged on a position different from a position of the transmission part,
a first polarizing filter provided on a first light path from the transmission part to the first capturing device, and
a second polarizing filter provided on a second light path from the transmission part to the second image capturing device,
a third polarizing filter provided on the first light path from the transmission part to the first capturing device and on the second light path from the transmission part to the second image capturing device, wherein the first and third polarizing filters have polarizing directions crossing each other to thereby mask light from the transmission part to the first image capturing device, and the second and third polarizing filters have polarizing directions crossing each other to thereby mask light from the transmission part to the second image capturing device, and
a foreign matter detection part for detecting foreign matter in the target area on the basis of the first and second images acquired by the first and second image capturing devices,
wherein the entry/exit port is on edges of the first and second fields of view, and the first and second image capturing devices are arranged so that the entry/exit port is present at edges of the acquired first and second images.