Morimoto Takuma, Kishigami Sho, Linhares João M M, Nascimento Sérgio M C, Smithson Hannah E
Opt Express. 2019 Oct 28;27(22):32277-32293. doi: 10.1364/OE.27.032277.
Objects placed in real-world scenes receive incident light from every direction, and the spectral content of this light may vary from one direction to another. In computer graphics, environmental illumination is approximated using maps that specify illumination at a point as a function of incident angle. However, to-date, existing public databases of environmental illumination specify only three colour channels (RGB). We have captured a new set of 12 environmental illumination maps (eight outdoor scenes; four indoor scenes) using a hyperspectral imaging system with 33 spectral channels. The data reveal a striking directional variation of spectral distribution of lighting in natural environments. We discuss limitations of using daylight models to describe natural environmental illumination.
放置在现实世界场景中的物体从各个方向接收入射光，并且这种光的光谱成分可能因方向而异。在计算机图形学中，环境光照是通过将光照指定为入射角函数的地图来近似的。然而，到目前为止，现有的环境光照公共数据库仅指定了三个颜色通道（RGB）。我们使用具有33个光谱通道的高光谱成像系统捕获了一组新的12张环境光照地图（八个室外场景；四个室内场景）。数据揭示了自然环境中光照光谱分布的显著方向变化。我们讨论了使用日光模型来描述自然环境光照的局限性。
