Color Science Seminar - Appearance Attributes and Factors Impacting their Perception
Appearance Attributes and Factors Impacting their PerceptionDavit GigilashviliResearch Fellow & Ph.D. CandidateNorwegian Color and Visual Computing LaboratoryAbstract:Appearance is a multiplex visual phenomenon that is usually broken down to several appearance attributes for simplification of studying its nature. Color, texture, gloss, and translucency are considered major appearance attributes. While significant work has been done in metrology for accurate instrumental measurement of appearance, little is known how humans perceive appearance, what factors impact their perception, and how different attributes interact with each other. Although color perception mechanisms are relatively well understood, the same cannot be said about other attributes of appearance.In this work, we try to bring to light various aspects of appearance perception using psychophysical experiments. We have been conducting series of psychophysical experiments with various real and synthetic visual stimuli, in order to identify behavioral patterns in the visual appearance assessment process that should lead to a qualitative model of the visual appearance.Secondly, we identified interactions among the appearance attributes. Particularly interesting question is impact of translucency on gloss perception. Gloss is widely accepted as a surface-based property, both by definition and by means of metrology. However, mechanisms of gloss perception are yet to be fully understood. Potential cues generating gloss perception can be a product of phenomena other than surface. While human observers are less likely to be capable of inverting optics, they might also fail predicting the origin of the cues. Therefore, we hypothesize that translucency impacts perceived glossiness.Speaker Bio:Davit Gigilashvili is a research fellow at the Norwegian Color and Visual Computing Laboratory, and a PhD candidate at the Norwegian University of Science and Technology, where his research topics are material appearance and translucency perception.Before starting a PhD study, he received an European joint master's degree in Color Science in 2017 from Jean Monnet University, the University of Granada and the Norwegian University of Science and Technology, and a bachelor's degree in Computer Science from the University of Georgia in 2015. He is currently visiting Yale University as an assistant in research. He is studying impact of translucency on glossiness perception together with Prof. Holly Rushmeier and Yale Computer Graphics Group.His research interests are material appearance, translucency and gloss perception, color vision, material identification, and image quality.Intended Audience:Graduates.
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