Shedding Light on the Weather

Srinivasa G. Narasimhan and Shree K Nayar
Proceedings of the 2003 IEEE Computer Society Conference on Computer Vision and Pattern Recognition, July, 2003, pp. 665 - 672.


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Abstract
Virtually all methods in image processing and computer vision, for removing weather effects from images, assume single scattering of light by particles in the atmosphere. In reality, multiple scattering effects are significant. A common manifestation of multiple scattering is the appearance of glows around light sources in bad weather. Modeling multiple scattering is critical to understanding the complex effects of weather on images, and hence essential for improving the performance of outdoor vision systems.

We develop a new physics-based model for the multiple scattering of light rays as they travel from a source to an observer. This model is valid for various weather conditions including fog, haze, mist and rain. Our model enables us to recover from a single image the shapes and depths of sources in the scene. In addition, the weather condition and the visibility of the atmosphere can be estimated. These quantities can, in turn, be used to remove the glows of sources to obtain a clear picture of the scene. Based on these results, we demonstrate that a camera observing a distant source can serve as a ?visual weather meter?. The model and techniques described in this paper can also be used to analyze scattering in other media, such as fluids and tissues. Therefore, in addition to vision in bad weather, our work has implications for medical and underwater imaging.


Notes
Associated Center(s) / Consortia: Vision and Autonomous Systems Center
Associated Lab(s) / Group(s): Illumination and Imaging Lab
Number of pages: 8

Text Reference
Srinivasa G. Narasimhan and Shree K Nayar, "Shedding Light on the Weather," Proceedings of the 2003 IEEE Computer Society Conference on Computer Vision and Pattern Recognition, July, 2003, pp. 665 - 672.

BibTeX Reference
@inproceedings{Narasimhan_2003_4980,
   author = "Srinivasa G Narasimhan and Shree K Nayar",
   title = "Shedding Light on the Weather",
   booktitle = "Proceedings of the 2003 IEEE Computer Society Conference on Computer Vision and Pattern Recognition",
   pages = "665 - 672",
   month = "July",
   year = "2003",
   volume = "1",
}