NDLI: Brightness Adjustment for HDR and Tone Mapped Images

Content Provider	IEEE Xplore Digital Library
Author	Krawczyk, G. Mantiuk, R. Zdrojewska, D. Seidel, H.-P.
Copyright Year	2007
Description	Author affiliation: MPI Informatik, Saarbrucken (Krawczyk, G.)
Abstract	Both high dynamic range images and their tone mapped correspondents contain relative luminance values which have to be mapped on a scale of available gray levels of a display. Such mapping includes brightness adjustment, which has a direct impact on the final image appearance and the observers' assessment of image quality. We conduct a psychophysical experiment in which subjects adjust image brightness to match their preference. We observe that the brightness choice is consistent across subjects and is primarily affected by image content. We investigate popular methods for automatic brightness adjustment and show a significant inaccuracy for a group of images. The incorrect brightness adjustment degrades in these cases perceived image quality. We identify characteristics of images that are highly correlated with the subjects' choice of brightness and develop an improved model for the brightness adjustment.
Starting Page	373
Ending Page	381
File Size	2091458
Page Count	9
File Format	PDF
ISBN	9780769530093
ISSN	15504085
DOI	10.1109/PG.2007.38
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Brightness Layout Displays TV Dynamic range Photography Image quality Computer graphics Visualization Printing
Content Type	Text
Resource Type	Article

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