NDLI: Method of auto multi-exposure for high dynamic range imaging

Content Provider	IEEE Xplore Digital Library
Author	Yongjie Piao Wei Xu
Copyright Year	2010
Description	Author affiliation: Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, China (Yongjie Piao; Wei Xu)
Abstract	This paper proposes a method for calculating the multi-exposure times fast and accurately when the scene has a high dynamic range, minimizing the pictures needed to take and improving the dynamic range of the CCD system. The proposed method first measures the camera's response function referring [10]. After that the median value of the output picture is adjusted to be in the middle range of the system output by changing the exposure time. It can be inferred from the histogram of the current picture whether it's a high dynamic range scene by calculating the number of pixels under exposed and over exposed. Once again the under and over exposed pixels are adjusted to be in the middle according to the camera's response function. Finally different exposed pictures (2 or 3) are fused together by Gaussian function and the dynamic range is compressed by γ correction. Experimental results on UNIQ-UM400 analog camera and a digital acquisition system show that the algorithm works well and solve the problem of low dynamic range of CCD camera.
Starting Page	93
Ending Page	97
File Size	1152439
Page Count	5
File Format	PDF
ISBN	9781424479573
e-ISBN	9781424479580
DOI	10.1109/CMCE.2010.5609915
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-08-24
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Response function High dynamic range imaging Auto exposure Median value Photonics Multi-exposure
Content Type	Text
Resource Type	Article

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