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Paper Abstract and Keywords
Presentation 2024-03-27 10:30
A Dynamic-Range Extension Technique with Linear-Logarithmic Response for Short-Pulse Time-of-Flight Image Sensors
Tomohiro Okuyama, Keita Yasutomi, Keiichiro Kagawa, Shoji Kawahito (Shizuoka Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) This paper presents an extension of the dynamic range of a short-pulse indirect ToF (Time-of-Flight) range sensor with linear-logarithmic response readout. The dynamic range is extended without modifying the pixel circuit by using linear-logarithmic response in the SP iToF (short-pulse indirect ToF) pixel, but only by modifying the control signal. To linearize the ToF calculation in logarithmic region, a technique of restoring entirely linear signal from linear-logarithmic response using the proposed theoretical formula is investigated. The theoretical formula well explains the linear-logarithmic response obtained by circuit simulations. The non-linearity error of the restored linear output is 0.02 % to the full-scale range for the case that the dynamic range is extended by 30 times using a logarithmic response. The proposed technique is applied to the hybrid ToF distance measurements. It is demonstrated that the linearity is greatly improved even for objects emitting light 30 times greater than the maximum light.
Keyword (in Japanese) (See Japanese page) 
(in English) Time-of-Fright / High dynamic-range / Short pulse / Indirect ToF / linear-logarithmic response / / /  
Reference Info. ITE Tech. Rep., vol. 48, no. 15, IST2024-12, pp. 4-7, March 2024.
Paper # IST2024-12 
Date of Issue 2024-03-20 (IST) 
ISSN Online edition: ISSN 2424-1970
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Conference Information
Committee IST  
Conference Date 2024-03-27 - 2024-03-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To IST 
Conference Code 2024-03-IST 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Dynamic-Range Extension Technique with Linear-Logarithmic Response for Short-Pulse Time-of-Flight Image Sensors 
Sub Title (in English)  
Keyword(1) Time-of-Fright  
Keyword(2) High dynamic-range  
Keyword(3) Short pulse  
Keyword(4) Indirect ToF  
Keyword(5) linear-logarithmic response  
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1st Author's Name Tomohiro Okuyama  
1st Author's Affiliation Shizuoka University (Shizuoka Univ.)
2nd Author's Name Keita Yasutomi  
2nd Author's Affiliation Shizuoka University (Shizuoka Univ.)
3rd Author's Name Keiichiro Kagawa  
3rd Author's Affiliation Shizuoka University (Shizuoka Univ.)
4th Author's Name Shoji Kawahito  
4th Author's Affiliation Shizuoka University (Shizuoka Univ.)
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Speaker Author-1 
Date Time 2024-03-27 10:30:00 
Presentation Time 20 minutes 
Registration for IST 
Paper # IST2024-12 
Volume (vol) vol.48 
Number (no) no.15 
Page pp.4-7 
#Pages
Date of Issue 2024-03-20 (IST) 


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