| Lightness perception in high dynamic range images: Local and remote luminance effects. | |
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MedLine Citation:
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PMID: 22323784 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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We measured the perceived lightness of target patches embedded in high dynamic range checkerboards. We independently varied the luminance of checks immediately surrounding the test and those remote from it. The data establish context transfer functions (CTFs) that characterize perceptual matches across checkerboard contexts. Several features of the CTFs are broadly consistent with previous research: Matched luminance decreases when overall context luminance decreases; matched luminance increases when overall context luminance increases; manipulating context locations near the target has a greater effect than manipulating locations far from the target patch. The measured CTFs are not well described, however, by changes with context in multiplicative gain alone or by changes in both multiplicative and subtractive adaptation parameters. We were able to fit the data with a three-parameter model of adaptation. This allowed us to characterize the CTFs by specifying the luminances that appeared white, black, and gray (white point, black point, and gray point, respectively). The white and black points depended additively on the local and remote contrasts, but accounting for the gray point required an interaction term. Analysis of this effect suggests that the target patch itself must be included in a description of the visual context. |
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Authors:
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Sarah R Allred; Ana Radonjic; Alan L Gilchrist; David H Brainard |
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Publication Detail:
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Type: Journal Article Date: 2012-02-08 |
Journal Detail:
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Title: Journal of vision Volume: 12 ISSN: 1534-7362 ISO Abbreviation: J Vis Publication Date: 2012 |
Date Detail:
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Created Date: 2012-02-10 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101147197 Medline TA: J Vis Country: United States |
Other Details:
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Languages: eng Pagination: - Citation Subset: IM |
Affiliation:
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Department of Psychology, Rutgers, The State University of New Jersey, Camden, NJ, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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