Render synthetic fog into interior and exterior photographs
Fukai Zhao, Ming Zeng, Bo Jiang, Xinguo Liu · 2013
In this paper, we propose a framework for rendering synthetic fog into interior and exterior photographs. Given a single photograph as input, our approach first obtains an approximation of the illumination and geometry for the underlying scene with a few user assistance, then generates a Transmittance Map (TMap) and a Volumetric Map (VMap) for the input photograph according to a decomposition of reflective radiance and transmittance, finally synthesizes the foggy photograph by combining the input photograph, the Transmittance Map and the Volumetric Map. Our approach employs physically based rendering technique and take into account not only the effect of increasing illumination in shadow areas and desaturation of surface reflection but also glow around the area lights and light shafts for directional lights. Compared with the previous image processing method, our approach can produce more realistic results. In addition, we demonstrate in a user study that synthetic images produced by our approach are confusable with real photographs.