Abstract Withdrawn
Presentation Number:T42.21 Time:11:15 - 11:30 Abstract Number:0062 |
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Temporal structure of blue colour processing – a MEG multifocal study
Presentation Number:T42.22 Time:11:30 - 11:45 Abstract Number:0115 |
David Crewther 1, *, Laila Hugrass 11Swinburne University of Technology
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Glossiness perception not depending on specular highlights - impacts of luminance edges
Presentation Number:T42.23 Time:11:45 - 12:00 Abstract Number:0009 |
Hiroaki Kiyokawa 1, *, Tomonori Tashiro 1, Yuki Kawashima 1, Yasuki Yamauchi 1, Takehiro Nagai 11Department of Informatics, Yamagata University
Human observers perceive glossiness on object surfaces from rather low luminance regions without specular highlights (Kim et al., 2012). However, it has been unclear what image information was a cue for perceived glossiness based on low luminance regions. To examine this issue, we performed glossiness rating experiments using a number of computer-graphics images of objects with different shapes, reflectance properties, and light fields. There were two conditions about stimulus luminances: the normal condition in which computer-graphics images were directly used, and the no-highlight condition in which luminances of specular highlights were clipped. In the results, glossiness rating scores were higher in the no-highlight condition than the normal condition in some objects, demonstrating that low-luminance regions more strongly contribute to perceived glossiness than specular highlights in certain conditions. Furthermore, a Laplacian filter analysis showed that, on the objects on which the rating scores were higher in no-highlight condition, amounts of luminance edges on object surfaces were strongly correlated with the rating scores, while they were only weakly correlated on the other objects. These results suggest that luminance edge components on object surfaces are an effective cue for perceived glossiness even when high luminance regions do not exist.
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Visual perception of pigmentation on facial skin-color distribution
Presentation Number:T42.24 Time:12:00 - 12:15 Abstract Number:0108 |
Yu Fang 1, *, Yoko Mizokami 1, Hirohisa Yaguchi 21Graduate School of Engineering, Chiba University 2Chiba University
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