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Paper Abstract and Keywords
Presentation 2020-02-27 11:10
Contrast sensitivity functions measured on luminance-variegated background
Misaki Hayasaka (Yamagata Univ.), Takehiro Nagai (Tokyo Tech), Tomoharu Sato (NIT, Ichinoseki College), Tomonori Tashiro, Yasuki Yamauchi (Yamagata Univ.), Ichiro Kuriki (Tohoku Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) In classical studies, contrast sensitivity functions (CSFs) were measured under full adaptation to a uniform background. Thus, it is unclear whether they reflect sensitivity characteristics in a scene with variegated luminance such as our daily life environment. Here, we psychophysically investigated the effects of the dynamic range widths of the textured background on CSFs. The test stimulus was a Gabor patch on a uniform rectangle pedestal, whose luminance was randomly chosen from five levels in each trial. The background was either of horizontal textures with different luminance dynamic range widths. In the results, the sensitivity was maximum at the pedestal luminance close to the mean luminance of the background for lower spatial frequency targets, but not for higher spatial frequency targets. These results suggest that the mechanisms of sensitivity optimization to the background luminance distributions differ among spatial frequencies of target stimuli.
Keyword (in Japanese) (See Japanese page) 
(in English) Contrast sensitivity function / Luminance / Spatial frequency / Adaptation / Psychophysics / / /  
Reference Info. ITE Tech. Rep., vol. 44, no. 6, HI2020-27, pp. 157-162, Feb. 2020.
Paper # HI2020-27 
Date of Issue 2020-02-20 (MMS, HI, ME, AIT) 
ISSN Print edition: ISSN 1342-6893    Online edition: ISSN 2424-1970
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Conference Information
Conference Date 2020-02-27 - 2020-02-28 
Place (in Japanese) (See Japanese page) 
Place (in English) Hokkaido Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Image Processing, etc. 
Paper Information
Registration To HI 
Conference Code 2020-02-HI-IE-ITS-MMS-ME-AIT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Contrast sensitivity functions measured on luminance-variegated background 
Sub Title (in English)  
Keyword(1) Contrast sensitivity function  
Keyword(2) Luminance  
Keyword(3) Spatial frequency  
Keyword(4) Adaptation  
Keyword(5) Psychophysics  
1st Author's Name Misaki Hayasaka  
1st Author's Affiliation Yamagata University (Yamagata Univ.)
2nd Author's Name Takehiro Nagai  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
3rd Author's Name Tomoharu Sato  
3rd Author's Affiliation National Institute of Technology, Ichinoseki College (NIT, Ichinoseki College)
4th Author's Name Tomonori Tashiro  
4th Author's Affiliation Yamagata University (Yamagata Univ.)
5th Author's Name Yasuki Yamauchi  
5th Author's Affiliation Yamagata University (Yamagata Univ.)
6th Author's Name Ichiro Kuriki  
6th Author's Affiliation Tohoku University (Tohoku Univ.)
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Speaker Author-1 
Date Time 2020-02-27 11:10:00 
Presentation Time 15 minutes 
Registration for HI 
Paper # MMS2020-27, HI2020-27, ME2020-55, AIT2020-27 
Volume (vol) vol.44 
Number (no) no.6 
Page pp.157-162 
Date of Issue 2020-02-20 (MMS, HI, ME, AIT) 

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