US 11,754,446 B2
Thermal imaging apparatus and temperature calibration method of thermal imaging apparatus
Chia-Chang Li, Pingtung (TW); Shih-Chun Chang, Tainan (TW); Jay Huang, Tainan (TW); and Wen-Hung Ting, Tainan (TW)
Assigned to INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE, Hsinchu (TW)
Filed by INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE, Hsinchu (TW)
Filed on Mar. 30, 2021, as Appl. No. 17/217,849.
Claims priority of application No. 109140755 (TW), filed on Nov. 20, 2020.
Prior Publication US 2022/0163395 A1, May 26, 2022
Int. Cl. G01J 5/00 (2022.01); G01J 5/0806 (2022.01); G01J 5/02 (2022.01); G01J 5/80 (2022.01); G01J 5/48 (2022.01)
CPC G01J 5/0025 (2013.01) [G01J 5/0275 (2013.01); G01J 5/0806 (2013.01); G01J 5/485 (2022.01); G01J 5/80 (2022.01); G01J 2005/0077 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A thermal imaging apparatus for measuring a temperature of a target in a monitored area, comprising:
a thermal imager configured to capture a thermal image of the monitored area;
an optical image capturing device configured to capture optical images of the monitored area; and
a computing processing device connected to the thermal imager and the optical image capturing device, and configured to perform steps comprising:
determining one of the optical images as a determined optical image synchronizing in time with the thermal image according to positions of blocks corresponding to the target in the thermal image and the optical images;
performing calculation according to the thermal image and the determined optical image to obtain a measured distance between the target and the thermal imaging apparatus; and
performing calibration according to the measured distance and the thermal image to obtain a calibrated temperature value of the target,
wherein determining one of the optical images as the determined optical image synchronizing with the thermal image according to the positions of the blocks corresponding to the target in the thermal image and the optical images that the computing processing device is configured to perform comprises:
determining a plurality of differences between the block corresponding to the target of the thermal image and the blocks corresponding to the target of the optical images; and
using one of the optical images with a smallest difference among the differences as the determined optical image synchronizing with the thermal image.