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Paper Abstract and Keywords
Presentation 2009-12-10 13:30
A high-speed local contrast correction method without local pixel-block dependency
Sousuke Shimoyama, Masayuki Ikebe, Masaki Igarashi, Jyunichi Motohisa (Hokkaido Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) Local Histogram Equalization (LHE), which is efficient for High Dynamic Range (HDR) compression, requires a large amount of calculation and induces unnatural image quality. Using checker-wise histogram acquisition and line buffer, memory accessing for local histograms is processed in O(1) time. Moreover, for improving image quality, we proposed approximation of LHE by compositing gamma functions. Setting parameters to each luminance tone, image quality is regulated adaptively. Using C++, we achieved two million pixels per 0.3 sec operation and real-time VGA movie processing.
Keyword (in Japanese) (See Japanese page) 
(in English) High Dynamic Range Compression / Local Histogram Equalization (LHE) / Gamma function / / / / /  
Reference Info. ITE Tech. Rep., vol. 33, no. 56, IST2009-91, pp. 5-8, Dec. 2009.
Paper # IST2009-91 
Date of Issue 2009-12-03 (IST) 
ISSN Print edition: ISSN 1342-6893  Online edition: ISSN 2424-1970
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Conference Information
Committee IST  
Conference Date 2009-12-10 - 2009-12-11 
Place (in Japanese) (See Japanese page) 
Place (in English) Univ. of Tokyo 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To IST 
Conference Code 2009-12-IST 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A high-speed local contrast correction method without local pixel-block dependency 
Sub Title (in English)  
Keyword(1) High Dynamic Range Compression  
Keyword(2) Local Histogram Equalization (LHE)  
Keyword(3) Gamma function  
1st Author's Name Sousuke Shimoyama  
1st Author's Affiliation Hokkaido University (Hokkaido Univ.)
2nd Author's Name Masayuki Ikebe  
2nd Author's Affiliation Hokkaido University (Hokkaido Univ.)
3rd Author's Name Masaki Igarashi  
3rd Author's Affiliation Hokkaido University (Hokkaido Univ.)
4th Author's Name Jyunichi Motohisa  
4th Author's Affiliation Hokkaido University (Hokkaido Univ.)
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Date Time 2009-12-10 13:30:00 
Presentation Time 30 
Registration for IST 
Paper # IST2009-91 
Volume (vol) 33 
Number (no) no.56 
Page pp.5-8 
Date of Issue 2009-12-03 (IST) 

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