Is there a preference for linearity when viewing natural images?

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• dc.contributor.author Kane, Davidca
• dc.contributor.author Bertalmío, Marceloca
• dc.date.accessioned 2016-06-13T10:28:32Z
• dc.date.available 2016-06-13T10:28:32Z
• dc.date.issued 2015ca
• dc.description.abstract The system gamma of the imaging pipeline, defined as the product of the encoding and decoding gammas, is typically greater than one and is stronger for images viewed with a dark background (e.g. cinema) than those viewed in lighter conditions (e.g. office displays).1-3 However, for high dynamic range (HDR) images reproduced on a low dynamic range (LDR) monitor, subjects often prefer a system gamma of less than one,4 presumably reflecting the greater need for histogram equalization in HDR images. In this study we ask subjects to rate the perceived quality of images presented on a LDR monitor using various levels of system gamma. We reveal that the optimal system gamma is below one for images with a HDR and approaches or exceeds one for images with a LDR. Additionally, the highest quality scores occur for images where a system gamma of one is optimal, suggesting a preference for linearity (where possible). We find that subjective image quality scores can be predicted by computing the degree of histogram equalization of the lightness distribution. Accordingly, an optimal, image dependent system gamma can be computed that maximizes perceived image quality. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
• dc.format.mimetype application/pdfca
• dc.identifier.citation Kane D, Bertalmío M. Is there a preference for linearity when viewing natural images?. In: Larabi M-C, Triantaphillidou, editors. Proc. SPIE 9396, Image Quality and System Performance XII; 2015 Febr 8-12; San Francisco, United States. [S.l]: SPIE; 2015. [p.1-10]. DOI: 10.1117/12.2179003ca
• dc.identifier.doi http://dx.doi.org/10.1117/12.2179003
• dc.identifier.issn 0277-786Xca
• dc.identifier.uri http://hdl.handle.net/10230/26910
• dc.language.iso engca
• dc.publisher Society of Photo Optical Instrumentation Engineers (SPIE)ca
• dc.relation.ispartof Larabi M-C, Triantaphillidou, editors. Proc. SPIE 9396, Image Quality and System Performance XII; 2015 Febr 8-12; San Francisco, United States. [S.l]: SPIE; 2015. [p.1-10].
• dc.relation.projectID info:eu-repo/grantAgreement/EC/FP7/306337ca
• dc.rights © 2015 Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.Kane D, Bertalmío M. Is there a preference for linearity when viewing natural images?. In: Larabi M-C, Triantaphillidou, editors. Proc. SPIE 9396, Image Quality and System Performance XII;2015 Febr 8-12; San Francisco, United States. [S.l]: SPIE; 2015. [p.1-10]. http://dx.doi.org/10.1117/12.2179003ca
• dc.rights.accessRights info:eu-repo/semantics/openAccessca
• dc.subject.keyword System gamma
• dc.subject.keyword High dynamic range
• dc.subject.keyword Low dynamic range
• dc.subject.keyword Image quality
• dc.subject.keyword Natural images
• dc.subject.keyword Lightness perception
• dc.title Is there a preference for linearity when viewing natural images?ca
• dc.type info:eu-repo/semantics/conferenceObjectca
• dc.type.version info:eu-repo/semantics/publishedVersionca