Radiometric Calibration of Digital Counts of Infrared Thermal Cameras

Infrared thermal cameras have applications in a range of fields including security, agriculture, inspection, and health. In this paper, we are interested in their sensing properties, where we model and estimate the camera parameters required to transform digital counts to temperature values. Specifi...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2019-11, Vol.68 (11), p.4387-4399
Main Authors: Gonzalez-Chavez, Othon, Cardenas-Garcia, Daniel, Karaman, Sertac, Lizarraga, Mariano, Salas, Joaquin
Format: Article
Language:English
Subjects:
Blackbody
Calibration
Cameras
Digital counts to temperature
infrared (IR) thermal cameras
Infrared cameras
Inspection
Irradiance
Parameter estimation
Polynomials
Radiance
radiometric calibration
Radiometry
Temperature
Temperature dependence
Temperature measurement
Temperature sensors
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Summary:Infrared thermal cameras have applications in a range of fields including security, agriculture, inspection, and health. In this paper, we are interested in their sensing properties, where we model and estimate the camera parameters required to transform digital counts to temperature values. Specifically, we propose a method to characterize the spatial deviation for the irradiance observed at the image plane for an uncooled focal-plane array camera deprived of an internal measurement of temperature. In our approach, we establish the relationship between the radiance emitted by a temperature varying blackbody chamber and the uncooled camera digital output. The model approximates this relationship as a quadratic polynomial whose variations are themselves approximated with another polynomial expression. Our results suggest a significant improvement over the commonly used Plancklike expression.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2018.2887070