Kane, DavidBertalmío, Marcelo2017-03-132017-03-132016Kane D, Bertalmío M. The role of lightness perception in determining the perceived contrast of real world scenes. In: IS&T International Symposium on Electronic Imaging Science and Technology; 2016 Febr. 14-18; San Francisco (CA, USA). Springfield: IS&T; 2016. Retinex at 50, p. RETINEX-022.1 [6 p.]. DOI: 10.2352/ISSN.2470-1173.2016.6.RETINEX-0221062-3701http://hdl.handle.net/10230/28215Comunicació presentada al IS&T International Symposium on Electronic Imaging, celebrat del 14 al 18 de febrer de 2016 a San Francisco (CA, USA) i organitzat per la Society for Imaging Science and Technology.We investigate the impact of the background luminance upon the perceived image quality of real world scenes. To do so, we generate a set of small image patches that span the full range of mean luminance values and contrasts that may be displayed upon a monitor with a finite luminance range. Subjects viewed the images on a uniform black, grey or white surround and were asked to rate the perceived quality on a scale from 0 to 9. We find that that the maximum image quality scores occur for images with a mean luminance of less than half, consistent with the image being passed through a compressive non-linearity before contrast is computed. Moreover, the maximum image quality scores occur at lower mean luminance levels when the background luminance is darker, a pattern consistent with investigations into lightness perception. We conclude that models of contrast perception require an adaptive model of lightness perception. However, we also note the considerable challenge of developing a model of lightness perception that can generalize to any given display configuration.application/pdfeng© 2016 Society for Imaging Science and Technology. Reprinted with permission of IS&T: The Society for Imaging Science and Technology sole copyright owners of Electronic Imaging, Retinex at 50.Imatges -- ProcessamentComunicació visualThe role of lightness perception in determining the perceived contrast of real world scenesinfo:eu-repo/semantics/conferenceObjecthttp://dx.doi.org/10.2352/ISSN.2470-1173.2016.6.RETINEX-022info:eu-repo/semantics/openAccess