Quantitative analysis of inhomogeneous luminance effect on visibility of text |
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Authors: | Takeshi Haraguchi Taka-aki Suzuki Katsunori Okajima |
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Institution: | 1. TOSHIBA TEC CORPORATION, Izunokuni, Shizuoka, 410-2392, Japan 2. Graduate School of Environment and Information Sciences, Yokohama National University, Yokohama, 240-8501, Japan 3. Industrial Research Institute of Shizuoka Prefecture, Shizuoka, 421-1298, Japan 4. Faculty of Environment and Information Sciences, Yokohama National University, Yokohama, 240-8501, Japan
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Abstract: | In the present study, we measured the visibility of several types of Japanese text on a liquid crystal display (LCD) with
a spatially inhomogeneous luminance and extended the visibility index function (VIF) to explain the current experimental results
with a higher degree of accuracy. We quantitatively analyzed the effect of an inhomogeneous luminance, which was produced
by the graphical representation of a background without reflected light and by reflected light on a homogeneous background.
These results showed that the visibility of text was influenced by the inhomogeneity of the background luminance in a domain
that depended on text size. Then we applied a weighted average background luminance with a two dimensional Gaussian function,
whose distribution width was related to the text size, to VIF. Finally, we proposed a modified VIF and showed that the new
method was able to precisely estimate the actual visibility of text with an inhomogeneous luminance. |
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