Defogging Method of Outdoor Scene Images Based on Hybrid Contrast Enhancement
Liang Yuan · Jisuanji fangzhen · 2010
Images captured in fog weather suffer from poor contrast and color,which drastically degrade the reliability and stability of outdoor surveillance system.According to the problem of smaller dynamic gray range and poorer contrast for fog-degraded images,this paper proposed a novel defogging method,which was based on the idea of Hybrid contrast enhancement.Firstly,a global model for defogging was proposed by analyzing the character of fog images,and then,the global contrast enhancement was obtained by optimizing the parameters in model;finally,according to the prior knowledge of atmosperical scattering model and the contrast exponential degrade law,a fuzzy contrast enhancement method was proposed for further local details.Experimental results demonstrate that the proposed hybrid method can enhance both the global contrast of the image and the details of the objects in scene images and performs better visal quality.