Ruppertsberg Alexa I, Bloj Marina
Bradford Optometry Colour and Lighting Lab, School of Life Sciences, University of Bradford, Bradford, UK.
J Vis. 2007 Oct 30;7(13):12.1-13. doi: 10.1167/7.13.12.
We present a numerical analysis of rendered pairs of rooms, in which the spectral power distribution of the illuminant in one room matched the surface reflectance function in the other room, and vice versa. We ask whether distinction between the rooms is possible and on what cues this discrimination is based. Using accurately rendered three-dimensional (3D) scenes, we found that room pairs can be distinguished based on indirect illumination, as suggested by A. L. Gilchrist and A. Jacobsen (1984). In a simulated color constancy scenario, we show that indirect illumination plays a pivotal role as areas of indirect illumination undergo a smaller appearance change than areas of direct illumination. Our study confirms that indirect illumination can play a critical role in surface color recovery and shows how computer rendering programs, which model the light-object interaction according to the laws of physics, are valuable tools that can be used to analyze and explore what image information is available to the visual system from 3D scenes.
我们对渲染的房间对进行了数值分析，其中一个房间中光源的光谱功率分布与另一个房间的表面反射率函数相匹配，反之亦然。我们探讨是否能够区分这些房间，以及这种区分基于哪些线索。使用精确渲染的三维（3D）场景，我们发现正如A. L. 吉尔克里斯特和A. 雅各布森（1984年）所指出的那样，房间对可以基于间接照明来区分。在模拟的颜色恒常性场景中，我们表明间接照明起着关键作用，因为间接照明区域的外观变化比直接照明区域小。我们的研究证实，间接照明在表面颜色恢复中可以发挥关键作用，并展示了根据物理定律对光与物体相互作用进行建模的计算机渲染程序是如何成为有价值的工具，可用于分析和探索视觉系统从3D场景中可获得哪些图像信息。
