Abstract
Inverse rendering pipelines are gaining prominence in realizing photo-realistic reconstruction of real-world objects for emulating them in virtual reality scenes. Apart from material reflectances, spectral rendering and in-scene illuminants' spectral power distributions (SPDs) play important roles in producing photo-realistic images. We present a simple, low-cost technique to capture and reconstruct the SPD of uniform illuminants. Instead of requiring a costly spectrometer for such measurements, our method uses a diffractive compact disk (CD-ROM) and a machine learning approach for accurate estimation. We show our method to work well with spotlights under simulations and few real-world examples. Presented results clearly demonstrate the reliability of our approach through quantitative and qualitative evaluations, especially in spectral rendering of iridescent materials.
Abstract (translated)
逆向渲染管线在实现真实世界物体的逼真重建方面日益重要，以便在虚拟现实场景中模拟这些物体。除了材料反射率之外，光谱渲染和场景内光源的光谱功率分布（SPD）对于生成逼真的图像也起着重要作用。我们提出了一种简单、低成本的技术来捕捉和重构均匀光源的SPD。我们的方法不需要昂贵的分光计进行此类测量，而是使用衍射紧凑盘（CD-ROM）和机器学习方法来进行准确估计。我们在模拟环境中以及少数现实世界示例中展示了该方法对聚光灯的有效性。所呈现的结果通过定量和定性评估清晰地证明了我们方法的可靠性，特别是在虹彩材料的光谱渲染方面。
URL
https://arxiv.org/abs/2410.22679
