US 12,430,799 B2
Calibration of temperature measurement system with thermal sensor and image sensor
Chih-Ming Sun, Hsin-Chu County (TW); Po-Wei Yu, Hsin-Chu County (TW); and Yen-Chang Chu, 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. 3, 2022, as Appl. No. 17/567,184.
Application 17/567,184 is a continuation in part of application No. 17/385,046, filed on Jul. 26, 2021.
Claims priority of provisional application 63/071,383, filed on Aug. 28, 2020.
Prior Publication US 2022/0122293 A1, Apr. 21, 2022
Int. Cl. G06T 7/80 (2017.01); A61B 5/01 (2006.01); G01J 5/00 (2022.01); G01J 5/80 (2022.01); G06T 7/30 (2017.01); H04N 23/90 (2023.01)
CPC G06T 7/80 (2017.01) [A61B 5/01 (2013.01); G01J 5/80 (2022.01); G06T 7/30 (2017.01); H04N 23/90 (2023.01); A61B 2560/0223 (2013.01); A61B 2562/0271 (2013.01); G01J 2005/0077 (2013.01); G06T 2207/10048 (2013.01); G06T 2207/30201 (2013.01)] 18 Claims
OG exemplary drawing
 
14. A temperature measurement system, comprising:
an image sensor, configured to capture an image frame with a first field of view covering a predetermined heated region having a reference temperature;
a thermal sensor, configured to capture a thermal image with a second field of view covering the predetermined heated region having the reference temperature; and
a memory, configured to record
a calibration temperature which is a temperature difference between the reference temperature and a measured temperature of a first region of interest (ROI) associated with the predetermined heated region in the thermal image, wherein the first ROI overlaps at least a part of a second ROI associated with the predetermined heated region in the image frame while overlapping the image frame and the thermal image, and
a number of offset pixels between the image frame and the thermal image captured at a reference distance.