A TRANSPLANTABLE COMPENSATION SCHEME FOR THE EFFECT OF THE RADIANCE FROM THE INTERIOR OF A CAMERA ON THE ACCURACY OF TEMPERATURE MEASUREMENT |
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| Authors: | Shidu Dong Xiaofan Yang Bo He and Guojin Liu |
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| Institution: | (1) Computer School, Chongqing Institute of Technology, Chongqing, 400040, China;(2) College of Computer Science, Chongqing University, Chongqing, 400044, China;(3) College of Communication, Chongqing University, Chongqing, 400044, China |
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| Abstract: | Radiance coming from the interior of an uncooled infrared camera has a significant effect on the measured value of the temperature
of the object. This paper presents a three-phase compensation scheme for coping with this effect. The first phase acquires
the calibration data and forms the calibration function by least square fitting. Likewise, the second phase obtains the compensation
data and builds the compensation function by fitting. With the aid of these functions, the third phase determines the temperature
of the object in concern from any given ambient temperature.
It is known that acquiring the compensation data of a camera is very time-consuming. For the purpose of getting the compensation
data at a reasonable time cost, we propose a transplantable scheme. The idea of this scheme is to calculate the ratio between
the central pixel’s responsivity of the child camera to the radiance from the interior and that of the mother camera, followed
by determining the compensation data of the child camera using this ratio and the compensation data of the mother camera
Experimental results show that either of the child camera and the mother camera can measure the temperature of the object
with an error of no more than 2°C. |
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| Keywords: | temperature measurement compensation scheme transplantable interior radiance effect |
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