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Proceedings Paper

Measurement and analysis of perceivable signal-to-noise ratio for infrared imaging system with human vision
Author(s): Xin Liu; Jing Zhao; Honghua Chang; Lin Ma
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Paper Abstract

The relationship between correct discrimination probability of the human eye and perceivable signal-to-noise (SNR) threshold is studied for different equilateral triangle sizes with specified luminance through combining theoretical calculation with practical experiment based on triangle orientation discrimination (TOD) performance evaluation method. Specifically, the simulation images of triangle patterns are generated by an infrared imaging system (IRIS) simulation model. And the perceivable SNRs for these images are calculated by establishing the system theoretical model and the human vision system model. Meanwhile, the Four-Alternative Forced-Choice experiment is performed. Experiment results of several observers are averaged statistically and the curves of perceivable SNR threshold which change with the correct discrimination probability are obtained. Finally, the analyses of these results show that these changes are in accordance with the psychometric function and that the fitting curves become steep with the increase of triangle sizes. These data and conclusions are helpful to modify the existing TOD performance model of an IRIS.

Paper Details

Date Published: 5 December 2012
PDF: 8 pages
Proc. SPIE 8562, Infrared, Millimeter-Wave, and Terahertz Technologies II, 85621J (5 December 2012); doi: 10.1117/12.999894
Show Author Affiliations
Xin Liu, Xidian Univ. (China)
Jing Zhao, Xidian Univ. (China)
Honghua Chang, Xidian Univ. (China)
Lin Ma, Xidian Univ. (China)

Published in SPIE Proceedings Vol. 8562:
Infrared, Millimeter-Wave, and Terahertz Technologies II
Cunlin Zhang; Xi-Cheng Zhang; He Li; Sheng-Cai Shi, Editor(s)

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