Fog Density Estimation and Image Defogging Based on Surrogate Modeling for Optical Depth

2017 ◽  
Vol 26 (7) ◽  
pp. 3397-3409 ◽  
Author(s):  
Yutong Jiang ◽  
Changming Sun ◽  
Yu Zhao ◽  
Li Yang
Keyword(s):  
Density Estimation ◽  
Optical Depth ◽  
Surrogate Modeling ◽  
Image Defogging ◽  
Fog Density

Image Defogging Based on Fog Veil Subtraction

2011 ◽  
Vol 121-126 ◽  
pp. 887-891
Author(s):  
Bin Xie ◽  
Fan Guo ◽  
Zi Xing Cai
Keyword(s):  
Original Image ◽  
Single Image ◽  
Image Defogging ◽  
Real Scene ◽  
Degraded Image ◽  
The Veil ◽  
Contrast Stretching ◽  
Reflectance Map ◽  
Fog Density

In this paper, we propose a new defog algorithm based on fog veil subtraction to remove fog from a single image. The proposed algorithm first estimates the illumination component of the image by applying smoothing to the degraded image, and then obtains the uniform distributed fog veil through a mean calculation of the illumination component. Next, we multiply the uniform veil by the original image to obtain a depth-like map and extract its intensity component to produce a fog veil whose distribution is according with real fog density of the scene. Once the fog veil is calculated, the reflectance map can be obtained by subtracting the veil from the degraded image. Finally, we apply an adaptive contrast stretching to the reflectance map to obtain an enhanced result. This algorithm can be easily extended to video domains and is verified by both real-scene photographs and videos.

Referenceless Prediction of Perceptual Fog Density and Perceptual Image Defogging

2015 ◽  
Vol 24 (11) ◽  
pp. 3888-3901 ◽  
Author(s):  
Lark Kwon Choi ◽  
Jaehee You ◽  
Alan Conrad Bovik
Keyword(s):  
Image Defogging ◽  
Fog Density

Optimal Transmission Estimation via Fog Density Perception for Efficient Single Image Defogging

2018 ◽  
Vol 20 (7) ◽  
pp. 1699-1711 ◽  
Author(s):  
Zhigang Ling ◽  
Jianwei Gong ◽  
Guoliang Fan ◽  
Xiao Lu
Keyword(s):  
Single Image ◽  
Image Defogging ◽  
Transmission Estimation ◽  
Fog Density

Voyager UVS observations of stellar occultations by the rings of Saturn

1984 ◽  
Vol 75 ◽  
pp. 265-277
Author(s):  
J.B. Holbelg ◽  
W.T. Forrester
Keyword(s):  
Optical Depth ◽  
Distance Scale ◽  
Density Waves ◽  
Ring Density ◽  
Stellar Occultations ◽  
Saturn’S Rings ◽  
Saturn's Rings

ABSTRACTDuring the Voyager 1 and 2 Saturn encounters the ultraviolet spectrometers observed three separate stellar occultations by Saturn's rings. Together these three observations, which sampled the optical depth of the rings at resolutions from 3 to 6 km. can be used to establish a highly accurate distance scale allowing the identification of numerous ring features associated with resonances due to exterior satellites. Three separate observations of an eccentric ringlet near the location of the Titan apsidal resonance are discussed along with other ringlet-resonance associations occurring in the C ring. Density waves occurring in the A and B rings are reviewed and a detailed discussion of the analysis of one of these features is presented.

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