US 11,754,293 B2
Auto detection system based on thermal signals
Chih-Ming Sun, Hsin-Chu County (TW); Ming-Han Tsai, Hsin-Chu County (TW); Chiung-Wen Lin, Hsin-Chu County (TW); Po-Wei Yu, Hsin-Chu County (TW); Wei-Ming Wang, Hsin-Chu County (TW); and Sen-Huang Huang, Hsin-Chu County (TW)
Assigned to PIXART IMAGING INC., Hsin-Chu County (TW)
Filed by PixArt Imaging Inc., Hsin-Chu County (TW)
Filed on Jan. 26, 2022, as Appl. No. 17/584,755.
Application 17/584,755 is a continuation of application No. 16/818,442, filed on Mar. 13, 2020, granted, now 11,280,500.
Application 16/818,442 is a continuation in part of application No. 16/458,626, filed on Jul. 1, 2019, granted, now 10,871,394.
Claims priority of provisional application 62/887,740, filed on Aug. 16, 2019.
Claims priority of provisional application 62/714,132, filed on Aug. 3, 2018.
Prior Publication US 2022/0146115 A1, May 12, 2022
Int. Cl. F24C 15/20 (2006.01); G01J 5/10 (2006.01); G01J 5/00 (2022.01); B66B 5/00 (2006.01); A61F 13/42 (2006.01)
CPC F24C 15/2042 (2013.01) [A61F 13/42 (2013.01); B66B 5/0012 (2013.01); G01J 5/0025 (2013.01); G01J 5/10 (2013.01); A61F 2013/421 (2013.01); G01J 2005/0077 (2013.01); G01J 2005/106 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An auto detection system, configured to monitor an elevator cabin, the auto detection system comprising:
a thermal detection device configured to output digital values at a predetermined frequency; and
a host configured to
receive the digital values,
calculate a slope between two digital values,
identify opening and closing of a door of the elevator cabin by comparing the calculated slop and a slope threshold range, and
calculate a fluctuation degree of multiple digital values within a predetermined time interval after the door is identified to be opened and then closed.