Department of Information and Communications Engineering, Tokyo Institute of Technology, Yokohama, Japan.
J Vis. 2023 Jan 3;23(1):11. doi: 10.1167/jov.23.1.11.
Glossiness can be increased by adding chromatic information to the object images. However, the mechanisms that create color-induced glossiness enhancement are unclear. In this study, we psychophysically measured the glossiness of object images to which various hue chromaticities were added to elucidate the perceptual and image factors that explain the color-induced glossiness enhancement effect. Two types of coloring conditions were tested: the both-colored (BC) condition, in which both specular and diffuse components were colored with the same chromaticity, and the diffuse-colored (DC) condition, in which only diffuse components were colored while specular components remained achromatic. The results showed that glossiness enhancement was more prominent in the BC than in the DC condition, and the dependency of glossiness enhancement on the stimulus color direction was similar to that of the Helmholtz-Kohlrausch (H-K) effect. Furthermore, we performed a regression analysis with a linear mixed model based on image features and an additional experiment in which an H-K effect-based increase in perceived brightness was imitated on achromatic stimuli by manipulating luminance. The results demonstrated that the H-K effect-based brightness enhancement in the highlight regions explains the glossiness enhancement effect well. These results suggest that the H-K effect, especially around the highlight region, is a dominant factor that creates the color-induced glossiness enhancement, although other color-related factors could also be partly involved.
光泽度可以通过向物体图像添加彩色信息来提高。然而，产生颜色诱导光泽增强的机制尚不清楚。在这项研究中，我们通过心理物理学测量了向物体图像添加各种色调的色度后，物体图像的光泽度，以阐明解释颜色诱导光泽增强效果的感知和图像因素。测试了两种类型的着色条件：全色（BC）条件，其中镜面和漫射分量都用相同的色度着色；和漫射色（DC）条件，其中只有漫射分量着色，而镜面分量保持非彩色。结果表明，BC 条件下的光泽增强比 DC 条件下更明显，光泽增强对刺激颜色方向的依赖性与赫尔姆霍兹-科尔劳施（H-K）效应的依赖性相似。此外，我们基于图像特征进行了线性混合模型的回归分析，并进行了额外的实验，通过操纵亮度在非彩色刺激上模仿基于 H-K 效应的感知亮度增加。结果表明，高光区域基于 H-K 效应的亮度增强很好地解释了光泽增强效应。这些结果表明，H-K 效应，特别是在高光区域，是产生颜色诱导光泽增强的主要因素，尽管其他与颜色相关的因素也可能部分参与。
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