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  Evaluation of reverse tone mapping through varying exposure conditions

Masia, B., Agustin, S., Fleming, R., Sorkine, O., & Gutierrez, D. (2009). Evaluation of reverse tone mapping through varying exposure conditions. ACM Transactions on Graphics, 28(5): 160, 1-8.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-C1BE-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-CB0B-E
Genre: Conference Paper

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 Creators:
Masia, B, Author
Agustin, S, Author
Fleming, RW1, 2, 3, Author              
Sorkine, O, Author
Gutierrez, D, Author
Affiliations:
1Research Group Computational Vision and Neuroscience, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497805              
2Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              
3Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Most existing image content has low dynamic range (LDR), which necessitates effective methods to display such legacy content on high dynamic range (HDR) devices. Reverse tone mapping operators (rTMOs) aim to take LDR content as input and adjust the contrast intelligently to yield output that recreates the HDR experience. In this paper we show that current rTMO approaches fall short when the input image is not exposed properly. More specifically, we report a series of perceptual experiments using a Brightside HDR display and show that, while existing rTMOs perform well for under-exposed input data, the perceived quality degrades substantially with over-exposure, to the extent that in some cases subjects prefer the LDR originals to images that have been treated with rTMOs. We show that, in these cases, a simple rTMO based on gamma expansion avoids the errors introduced by other methods, and propose a method to automatically set a suitable gamma value for each image, based on the image key and empirical data. We validate the results both by means of perceptual experiments and using a recent image quality metric, and show that this approach enhances visible details without causing artifacts in incorrectly-exposed regions. Additionally, we perform another set of experiments which suggest that spatial artifacts introduced by rTMOs are more disturbing than inaccuracies in the expanded intensities. Together, these findings suggest that when the quality of the input data is unknown, reverse tone mapping should be handled with simple, non-aggressive methods to achieve the desired effect.

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 Dates: 2009-12
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1145/1618452.1618506
BibTex Citekey: 6218
 Degree: -

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Title: SIGGRAPH Asia 2009
Place of Event: Yokohama, Japan
Start-/End Date: 2009-12-16 - 2009-12-19

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Title: ACM Transactions on Graphics
Source Genre: Journal
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Publ. Info: New York, NY : Association for Computing Machinery
Pages: - Volume / Issue: 28 (5) Sequence Number: 160 Start / End Page: 1 - 8 Identifier: ISSN: 0730-0301
CoNE: https://pure.mpg.de/cone/journals/resource/954925533022