针对水下图像颜色失真的问题,提出了基于双透射率水下成像模型的图像颜色校正算法。在水下成像模型的基础上,将透射率定义为直接分量透射率和后向散射分量透射率;通过红色暗通道先验获得后向散射分量透射率,并精确估计背景光,利用无退化像素点获得三通道的直接分量透射率;最后将两个透射率代入成像模型获得复原图像。实验结果表明,该算法仅依靠物理模型便能有效地去除水下图像的色偏。

We propose an image color correction algorithm based on a double transmission underwater imaging model to solve the color distortion problem associated with the underwater images. First, we divide the transmission as direct component transmission and backscatter component transmission based on the underwater imaging model. Subsequently, the backscatter component transmission is obtained by a red-dark channel prior, the background light is accurately estimated, and the direct component transmission of three channels is obtained based on the non-degenerate pixel points. Finally, both the transmissions are inserted into the imaging model to obtain the restored image. The experimental results demonstrate that the proposed algorithm can effectively remove the color cast of underwater images by relying only on the physical model.