Method of defogging image of outdoor scenes based on PDE

Images of outdoor scenes captured in fog suffer from poor contrast and color. It is important to remove weather effects from the degraded image in order to make vision systems more reliable and more robust. It has the prior knowledge that degradation of color and contrast quality due to bad weather is exponential in the depths of the scene points. Based on the atmospheric scattering physics-based models, the global defogging model and the local defogging model were constructed in terms of energy optimization methodology, and the key partial differential equation was deduced accordingly. The algorithm of defogging was advanced using only a single image in terms of simple additional information provided interactively by the user. The experiment results demonstrate that the algorithms can effectively restore clear day color and contrast from weather degraded image and can be applied in practice.