NDLI: Target region-aware tone reproduction

Content Provider	IEEE Xplore Digital Library
Author	Dun-Yu Hsiao Hong-Yuan Liao, M.
Copyright Year	2008
Description	Author affiliation: Inst. of Inf. Sci. Acad. Sinica, Taipei (Dun-Yu Hsiao)
Abstract	In this paper, we propose an automatic tone reproduction scheme. This scheme enhances the visual details of an image's low contrast regions, while preserving the details of high contrast regions. Our method first segments an image into a number of clusters based on luminance information. Subsequently, our scheme calculates the local variation of each cluster. Using the set of computed local variations, we obtain an adaptive gain factor of each pixel to make details of the image visible. With this adaptive gain factor, our method can directly enhance low contrast regions without affecting high contrast ones. The experimental results demonstrate that our method is superior to many existing algorithms, especially when testing on images that contain both high and low contrast regions. The reason behind these results is clear: most tone reproduction algorithms recover the details of low contrast regions, but simultaneously suppress the high contrast regions. Our algorithm, however, recovers the visual details of low contrast regions without sacrificing the quality of high contrast regions. Most importantly, our proposed automatic tone reproduction scheme eliminates the effort of manual adjustment of parameters.
Starting Page	276
Ending Page	279
File Size	1517108
Page Count	4
File Format	PDF
ISBN	9781424416837
DOI	10.1109/ISCAS.2008.4541408
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-05-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dynamic range Humans Information science Large-scale systems Visual system Image segmentation Pixel Testing Poisson equations Filters
Content Type	Text
Resource Type	Article

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