一种结合双区域滤波和图像融合的单幅图像去雾算法

基于大气散射物理模型和暗原色先验原理，提出一种结合 双区域滤波和图像融合的单幅图像去雾算法.首先在计算暗通道函数时，定义了一类暗区 域对图像边缘的低强度像素点进行描述，该区域像素点的暗原色中值取其三原色通道的最小值，以代替原来的中值滤波运算值.此滤波方法不仅能有效去除Halo效应，而且避免了黑斑效应；然后基 于大气散射物理模型定义一种伪去雾图，将其与原去雾图进行像素级融合对原图进行色度校正，实 现了柔性去雾，改善了现有方法易出现过去雾的缺陷.实验结果表明，该算法去雾后图像具有较好清 晰度及色彩恢复度，去雾鲁棒性强.在大雾和图像色彩失真严重的情况下，仍可有效恢复图像.

A Dehazing Method in Single Image Based on Double-area Filter and Image Fusion

A dehazing method based on double-regional filter and image fusion is proposed based on the atmospheric scattering model and dark channel prior principle. Firstly, a dark region is defined to describe the low intensity pixel of the image's edge area when the median filter is adopted to calculate the dark channel transmission. The minimum value of the color (RGB) channels are assigned to the dark channel in dark region pixels instead of its median. This method not only removes the halo effect but also avoids black spot. On the other hand, a pseudo-dehazed image based on the atmospheric scattering model is proposed to solve the over-defogging problem. The defect of over-defogging can be cut down by the pixels fusion between the original dehazed image and the pseudo-dehazed image. Experiments show that the dehazing images with the proposed method in this paper have better sharpness, color restore degrees and robustness, even on the dense fog and color distortion.