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Yoko Mizokami, Yuki Kiyasu, Hirohisa Yaguchi; Appearance of surface property influenced by the diffuseness of lighting. Journal of Vision 2017;17(10):134. doi: https://doi.org/10.1167/17.10.134.
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Lighting condition could largely influence the appearance of object surface property. It is known that the components of specular and diffuse reflection change depending on the diffuseness of lighting. The diffuseness of lighting could influence the appearance of various surface properties, and it would be important to investigate them systematically. We previously examined how the impression of surface appearance of test samples with different roughness and shape changed under diffused light and direct light, and our results suggested that glossiness and smoothness were main factors influenced by the lighting conditions (ECVP2016). Here, we further examine how the surface appearance of test samples with different roughness and shape changed by diffused light and direct light using real samples in real miniature rooms. We prepared plane test samples with three different levels of surface roughness and spheres with matt and gloss surfaces. A sample was placed in the center of a miniature room with either directed light or diffused light. We used a magnitude estimation method for evaluations. Observers evaluated its appearance in terms of glossiness, naturalness, translucency, sharpness, saturation, brightness, roughness, heaviness, hardness, and preference. They rated the appearance of test samples under diffused light for each item in comparison with that under the direct light, which was served as a reference. The results showed the difference of appearance in all items under directed and diffused lights. Those shifts were generally larger in glossiness, sharpness, brightness, and roughness, implying that those factors are especially influenced by the diffuseness of lighting. Samples tended to appear less glossy and smother under diffused light than direct light, and their difference was larger for a sample with rough surface. These trends were consistent with our previous finding.
Meeting abstract presented at VSS 2017
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