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Proceedings Paper

Text detection: effect of size and eccentricity
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Paper Abstract

The issue of reading on electronic devices is getting important as the popularity of mobile devices, such as cell phones or PDAs, increases. In this study, we used the spatial summation paradigm to measure the spatial constraints for text detection. Four types of stimuli (real characters, non-characters, Jiagu and scrambled lines) were used in the experiments. All characters we used had two components in a left-right configuration. A non-character was constructed by swapping the left and right components of a real character in position to render it unpronounceable. The Jiagu characters were ancient texts and have the same left-right configuration as the modern Chinese characters, but contain no familiar components. Thus, the non-characters keep the components while destroy the spatial configuration between them and the Jaigu characters have no familiar component while keep the spatial configuration intact. The detection thresholds for the same stimulus size and the same eccentricity were the same for all types of stimuli. When the text-size is small, the detection threshold of a character decreased with the increase in its size, with a slope of -1/2 on log-log coordinates, up to a critical size at all eccentricities and for all stimulus types. The sensitivity for all types of stimuli was increased from peripheral to central vision. In conclusion, the detectability is based on local feature analysis regardless of character types. The cortical magnification, E2, is 0.82 degree visual angle. With this information, we can estimate the detectability of a character by its size and eccentricity.

Paper Details

Date Published: 2 February 2011
PDF: 10 pages
Proc. SPIE 7865, Human Vision and Electronic Imaging XVI, 786515 (2 February 2011); doi: 10.1117/12.872366
Show Author Affiliations
Chien-Hui Kao, National Taiwan Univ. (Taiwan)
Chien-Chung Chen, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 7865:
Human Vision and Electronic Imaging XVI
Bernice E. Rogowitz; Thrasyvoulos N. Pappas, Editor(s)

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