著者

重松 征史 菅野 義之

出版者

一般社団法人 照明学会

雑誌

照明学会誌 (ISSN:00192341)

巻号頁・発行日

vol.70, no.6, pp.268-272, 1986-06-01 (Released:2011-07-19)

参考文献数

13

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A physiological intensity transform function, y=Xn/ (Xn+Sn); (sigmoidal function) was introduced by examining the stimulus-response relationship in the retinal neural-cell to lightness scale.The responses of the photoreceptor and horizontal cell show that the light intensity is transformed to be nonlinear. Their transform function is the sigmoidal one, which fits to the psychological functions at low light level of the power function and at middle level of the logarithmic one.This function also explained the characteristics of Weber's ratio as a function of light intensity by adopting the effectof light adaptation, and simulated the Munsell gray scale as well as the CIE lightness function.