关键词: 暗通道先验, 导向滤波器, 优化透射率

Abstract: The guided filter is often used in single image dehazing algorithm which is based on dark channel prior. This strategy can optimize atmospheric transmittance, preserve impressive dehazing effects as well as reducing the complexity of algorithms. However, the optimized transmittance map is not smooth enough and contains abundant detail information when adopting the hazy image as the guidance of guided filter, which will result in the relative poor visibility of the recovered image undoubtedly. Thus, this paper proposes an improved single image dehazing algorithm based on optimized guided filtering. This algorithm utilizes the atmospheric veil-based guide image to filter the atmospheric transmittance, then combines the optimized atmospheric transmittance and the atmosphere physical scattering model to recover the hazeoff image. Exhaustive experimental results on a variety of hazy images demonstrate that the color, details and structure of the recovered images are more powerful when compared with the dark channel prior method.

Key words: dark channel prior, guided filter, optimized transmittance