关键词: 图像去雾;中通道补偿;自适应大气光估计;侧窗导向滤波;图像分层

Abstract: Focusing on foggy images with low contrast and blurry detail， this paper decomposes the images into texture layer and structural layer firstly. Then the structural layer containing most of the fog is dehazed， and the texture layer is enhanced. To avoid the effect of white objects in the scene on atmospheric light estimation， this paper proposes a kind of stereo decision map in RGB space， and designs an atmospheric light estimation method which can adaptively distinguish between sky and non-sky area based on a threshold constraining scheme. Due to the inefficiency of dark channel prior when dealing with large areas of sky and dense fog， a transmission estimation approach based on middle channel compensation is put forward， which can avoid color distortion of dehazed images. Furthermore， the transmission is refined by the guided filtering with side window， which can preserve image details. Extensive experimental results show that the proposed approach can realize haze removal thoroughly， and the dehazed image has natural colors and vivid details.

Key words: image dehazing; middle channel compensation; adaptive atmospheric light estimation; guided filtering with side window; image layering