School of Psychology, University of Sydney, NSW, 2006, Australia.
Curr Biol. 2012 Oct 23;22(20):1909-13. doi: 10.1016/j.cub.2012.08.009. Epub 2012 Sep 6.
The amount and spectral content of the light reflected by most natural surfaces depends on the structure of the light field, the observer's viewing position, and 3D surface geometry, particularly for specular (glossy) surfaces. A growing body of data has demonstrated that perceived surface gloss can vary as a function of its 3D shape and its illumination field, but there is currently no explanation for these effects. Here, we show that the perception of gloss can be understood as a direct consequence of image properties that covary with surface geometry and the illumination field. We show that different illumination fields can generate qualitatively different patterns of interaction between perceived gloss and 3D surface geometry. Despite the complexity and variability of these interactions, we demonstrate that the perception (and misperception) of gloss is well predicted by the way that each illumination field modulates the size, contrast, sharpness, and depth of specular reflections. Our results provide a coherent explanation of the effects of extrinsic scene variables on perceived gloss, and our methods suggest a general technique for assessing the role of specific image properties in modulating our visual experience of material properties.
大多数自然表面的反射光的数量和光谱内容取决于光场的结构、观察者的观察位置和三维表面几何形状，特别是对于镜面（有光泽）表面。越来越多的数据表明，表面光泽的感知可以作为其三维形状和照明场的函数而变化，但目前还没有对这些效应的解释。在这里，我们表明，对光泽的感知可以理解为与表面几何形状和照明场相关的图像属性的直接结果。我们表明，不同的照明场可以产生在感知光泽和三维表面几何形状之间相互作用的定性不同的模式。尽管这些相互作用复杂且多变，但我们证明，每个照明场调制镜面反射的大小、对比度、锐度和深度的方式可以很好地预测对光泽的感知（和错觉）。我们的结果为外在场景变量对感知光泽的影响提供了一个连贯的解释，我们的方法还提出了一种评估特定图像属性在调节我们对材料属性的视觉体验中的作用的一般技术。
