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http://dx.doi.org/10.5573/ieie.2014.51.4.131

No-Reference Visibility Prediction Model of Foggy Images Using Perceptual Fog-Aware Statistical Features  

Choi, Lark Kwon (Department of Electrical and Computer Engineering, The University of Texas at Austin)
You, Jaehee (Department of Electronic and Electrical Engineering, Hongik University)
Bovik, Alan C. (Department of Electrical and Computer Engineering, The University of Texas at Austin)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.51, no.4, 2014 , pp. 131-143 More about this Journal
Abstract
We propose a no-reference perceptual fog density and visibility prediction model in a single foggy scene based on natural scene statistics (NSS) and perceptual "fog aware" statistical features. Unlike previous studies, the proposed model predicts fog density without multiple foggy images, without salient objects in a scene including lane markings or traffic signs, without supplementary geographical information using an onboard camera, and without training on human-rated judgments. The proposed fog density and visibility predictor makes use of only measurable deviations from statistical regularities observed in natural foggy and fog-free images. Perceptual "fog aware" statistical features are derived from a corpus of natural foggy and fog-free images by using a spatial NSS model and observed fog characteristics including low contrast, faint color, and shifted luminance. The proposed model not only predicts perceptual fog density for the entire image but also provides local fog density for each patch size. To evaluate the performance of the proposed model against human judgments regarding fog visibility, we executed a human subjective study using a variety of 100 foggy images. Results show that the predicted fog density of the model correlates well with human judgments. The proposed model is a new fog density assessment work based on human visual perceptions. We hope that the proposed model will provide fertile ground for future research not only to enhance the visibility of foggy scenes but also to accurately evaluate the performance of defog algorithms.
Keywords
안개;안개 가시성;가시성 예측;안개 인지;가시성 향상;
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