Hour perception from object's surface and scene: Effects of materials and locations M Kitazaki, A Yamamoto, T Uehara, Y Tani, T Nagai, K Koida, S Nakauchi |
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Computer Science and Engineering, Toyohashi University of Technology, Japan
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| We can estimate approximate time of day from visual information such as paintings. We aim to investigate how accurately human perceive time of day from photographs of objects and scenes, and effects of surface materials and scene locations. Photographs of a mirrored nickel and a glossy saddle leather that were identically corrugated (10x10x1.5cm) were taken at six hours (8, 10, 12, 14, 16, and 17 O'clock) at three locations (Inside of building near window, Play ground, and Outside of building on bricks) with constant exposure settings in a sunny day. We also took panorama pictures of three locations. Ten naive participants judged hours of taken pictures after 1s presentation of pictures of objects with background (Experiment 1), clipped pictures of objects only (Experiment 2), and panorama pictures (Experiment 3). Correct rates were almost identical for whole pictures of objects (35.7%; chance level 16.7%) and panoramas (35.6%), but lower for clipped object pictures (30%). Hour perception was more accurate for the nickel than the leather, and more accurate at the ground and the outside than the inside building. These results suggest that hour perception is not so accurate, and mainly based on average luminance, but also utilizing characteristics of environmental illumination. |
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