The relation between the just readable threshold of Chinese characters of various styles and adaptation luminance

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概要

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• The purpose of this study is to investigate the just readable threshold of Chinese characters of different styles as a function of the adaptation luminance. The test objects are 44 Chinese characters comprising from 2 to 19 elements from among those most frequently appearing in news papers and the styles of which are Gothic, Ming, semi-cursive and penwritten square, in daily use. The observers are of all normal vision, and the just readable threshold coressponding to 50% threshold is used.Results obtained are as follows.(1) The relation between the just readable threshold by style and adaptation luminance are approximated by following formulas : Gothic style : θ=(3.514(0.3394+L^<1/4>)^4)/L (minutes)Ming style : θ=(3.590(0.3485+L^<1/4>)^4)/L (minutes)Semi-cursive style : θ=(3.721(0.3528+L<1/4>)^4)/L (minutes)Pen-written style : θ=(3.815(0.3978+L<1/4>)^4)/L (minutes) where θ is the visual angle (minutes) of the character's height at the just readable threshold, and L is the adaptation luminance (cd/m^2).(2) Comparison between above formulas and approximate curve of minimum angle of resolution of the break width of the Landolt ring shows that the line width of the Gothic styles at the threshold are considerable lower than those estimated from the visual acuity.The heights of the characters measured in terms of visual angle at the threshold are 9.2 times as large for Gothic, 9.5 times for Ming, 10 times for semi-cursive and 11 times for pen-written square as that of break width of Landolt rings.(3) To recognize a Chinese character, first of all it must be of a certain size, and the line composing the character must be a certain width in order to distinguish the details, from the correspondence with the approximate curve of visual acuity.

• 社団法人照明学会の論文

著者

• Noda K

  Department Of Orthodontics School Of Dental Medicine Tsurumi University

• Noda Koji

  Tl Yamagiwa Laboratory Inc.

• Ikeda K

  Faculty Of Science And Engineering Science University Of Tokyo.

• IKEDA Koichi

  Faculty of Science and Engineering, Science University of Tokyo.

• OBARA Kiyoshige

  Faculty of Science and Engineering, Science University of Tokyo.

• YAMAGUCHI Shoichiro

  Faculty of Engineering, Tokyo Institute of Technology.

• Ikeda Kazuho

  Department Of Biological Sciences Graduate School Of Science University Of Tokyo

• Yamaguchi Shoichiro

  Faculty Of Engineering Tokyo Institute Of Technology.

• Yamaguchi Shoichiro

  Faculty Of Engineering Tokyo Institute Of Technology

• Ikeda K

  Osaka City Univ. Osaka Jpn

• Ikeda Koichi

  Tokyo Rika Daigaku

• Ikeda K

  Tokyo Rika Daigaku Dept. Electri. Engng. Fac. Sci. Tech.

• Obara Kiyoshige

  Faculty Of Science And Engineering Science University Of Tokyo.

• Ikeda Koichi

  Tokyo Rika Daigaku Department Of Electrical Engineering Faculty Of Science And Technology

• Ikeda Koichi

  Faculty Of Science And Engineering Tokyo Rikadaigaku (science University Of Tokyo)

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