关键词: 图像去雾, 暗通道先验, 边缘替代, 透射率

Abstract:

While the dark channel prior algorithm works well for single image haze removal,it has to take long time to proces and require expensive computational overhead and huge memory resource.In this paper,we propose a fast daze removal algorithm based on dark channel prior knowledge.In the proposed approach,edge substitution method is developed to take place of the original soft-matting operator,which will substantially reduce the computational complexity.To deal with the invalid case of the dark channel,we exploit a scheme to identify bright area based on dual threshold and develop a way to correct transmission rate,which enables the dark channel prior to be more applicable.Additionally,enhanced processing is introduced by adopting nonlinear contrast stretching,thus improving the visual effect of defogging images.Several numerical experiments demonstrate that the proposed approach outperforms the original algorithm in daze removal effect at a much lower implementation cost.

Key words: image daze removal, dark channel prior, edge substitution, transmission