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## [RLC+01]  Measuring the Perception of Visual Realism in Images

 Rademacher:2001:MPV (In proceedings) Author(s) Rademacher P., Lengyel J., Cutrell E. and Whitted T. Title « Measuring the Perception of Visual Realism in Images » In Rendering Techniques 2001. Proceedings of the 12th Eurographics Workshop on Rendering, (London, jun 2001) Editor(s) S. J. Gortler and K. Myszkowski Page(s) 235--247 Year 2001 Publisher Springer-Verlag Address Berlin $·$ Heidelberg $·$ New York Editor(s) S. J. Gortler and K. Myszkowski

 Abstract One of the main goals in realistic rendering is to generate images that are indistinguishable from photographs -- but how do observers decide whether an image is photographic or computer-generated? If this perceptual process were understood, then rendering algorithms could be developed to directly target these cues. In this paper we introduce an experimental method for measuring the perception of visual realism in images, and present the results of a series of controlled human subject experiments. These experiments cover the following visual factors: shadow softness, surface smoothness, number of light sources, number of objects, and variety of object shapes. This technique can be used to either affirm or cast into doubt common assumptions about realistic rendering. The experiments can be performed using either photographs or computergenerated images. This work provides a first step towards objectively understanding why some images are perceived as photographs, while others as computer graphics.

 BibTeX code @inproceedings{Rademacher:2001:MPV, optnote = {}, optorganization = {}, author = {Paul Rademacher and Jed Lengyel and Edward Cutrell and Turner Whitted}, optkey = {}, optannote = {}, optseries = {}, editor = {S. J. Gortler and K. Myszkowski}, address = {Berlin {$\cdot$} Heidelberg {$\cdot$} New York}, localfile = {papers/Rademacher.2001.MPV.pdf}, publisher = {Springer-Verlag}, doi = {http://doi.acm.org/10.1145/647653.732279}, optmonth = {}, citeseer = {http://citeseer.nj.nec.com/rademacher01measuring.html}, optcrossref = {}, booktitle = {{R}endering {T}echniques 2001. {P}roceedings of the 12th {E}urographics {W}orkshop on {R}endering, (London, jun 2001)}, optstatus = {doi}, optvolume = {}, optnumber = {}, title = {{M}easuring the {P}erception of {V}isual {R}ealism in {I}mages}, abstract = {One of the main goals in realistic rendering is to generate images that are indistinguishable from photographs -- but how do observers decide whether an image is photographic or computer-generated? If this perceptual process were understood, then rendering algorithms could be developed to directly target these cues. In this paper we introduce an experimental method for measuring the perception of visual realism in images, and present the results of a series of controlled human subject experiments. These experiments cover the following visual factors: shadow softness, surface smoothness, number of light sources, number of objects, and variety of object shapes. This technique can be used to either affirm or cast into doubt common assumptions about realistic rendering. The experiments can be performed using either photographs or computergenerated images. This work provides a first step towards objectively understanding why some images are perceived as photographs, while others as computer graphics.}, year = {2001}, pages = {235--247}, }

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