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Proceedings Paper

Conversion of infrared grey-level image into temperature field by polynomial curve fitting
Author(s): Terry Yuan-Fang Chen; Ming-Hsuan Kuo
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Paper Abstract

A simple method to convert the infrared gray-level image into temperature field is developed by using least squares polynomial curve fitting. In this method, the correspondence between the infrared gray-level image and the associated temperature field for various emissivity values and temperature range is analyzed first. Then a second-order polynomial can be applied to fit the correspondence between the gray-level image and the associated temperature field as a function of emissivity. For multiple conversions of temperature ranges, the constants of the fitted polynomial in multiple ranges can be further fitted as a function of emissivity and temperature range. Test of the method on a cup of hot water was done. An average error less than 1% was achieved between the proposed method and the commercial ones.

Paper Details

Date Published: 6 March 2015
PDF: 4 pages
Proc. SPIE 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation, 94461B (6 March 2015); doi: 10.1117/12.2180748
Show Author Affiliations
Terry Yuan-Fang Chen, National Cheng Kung Univ. (Taiwan)
Ming-Hsuan Kuo, National Cheng Kung Univ. (Taiwan)


Published in SPIE Proceedings Vol. 9446:
Ninth International Symposium on Precision Engineering Measurement and Instrumentation
Junning Cui; Jiubin Tan; Xianfang Wen, Editor(s)

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