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arXiv 1606.01460cs.CV
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利用光照校正去除夜间霾

Nighttime Haze Removal with Illumination Correction

Jing Zhang, Yang Cao, Zengfu Wang

摘要:

去雾对于计算摄影和计算机视觉应用是重要的。然而,现有的去雾方法大多是针对白天的图像设计的,并不能总是在夜间工作。与白天的成像条件不同,夜间雾霾条件下拍摄的图像可能会因人工光源而出现照明不均匀,表现出低亮度/对比度和色彩失真。在本文中,我们提出了一个新的夜间烟雾成像模型,同时考虑到非均匀照明的人工光源和烟雾的散射和衰减的影响。因此,我们提出了一个有效的去雾算法,夜间有雾的图像。该算法包括三个连续的步骤。i)它通过在从原始图像估计照明之后执行伽马校正步骤来增强整体亮度。ii)然后,在估计入射光的颜色特性之后,通过执行颜色校正步骤来实现颜色平衡结果。iii)最后,通过应用暗通道先验并基于先前的照明平衡结果估计逐点环境光来去除雾度效应。实验结果表明,该算法能够实现光照平衡和无雾效果,并具有良好的色彩还原能力。

英文摘要:

Haze removal is important for computational photography and computer vision applications. However, most of the existing methods for dehazing are designed for daytime images, and cannot always work well in the nighttime. Different from the imaging conditions in the daytime, images captured in nighttime haze condition may suffer from non-uniform illumination due to artificial light sources, which exhibit low brightness/contrast and color distortion. In this paper, we present a new nighttime hazy imaging model that takes into account both the non-uniform illumination from artificial light sources and the scattering and attenuation effects of haze. Accordingly, we propose an efficient dehazing algorithm for nighttime hazy images. The proposed algorithm includes three sequential steps. i) It enhances the overall brightness by performing a gamma correction step after estimating the illumination from the original image. ii) Then it achieves a color-balance result by performing a color correction step after estimating the color characteristics of the incident light. iii) Finally, it remove the haze effect by applying the dark channel prior and estimating the point-wise environmental light based on the previous illumination-balance result. Experimental results show that the proposed algorithm can achieve illumination-balance and haze-free results with good color rendition ability.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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