暗通道先验算法虽然在单幅图像去雾方面取得了一定的效果,但是该算法运行时间较长,另外对环境光的计算不太准确,不适用于天空区域,会导致复原图像色彩失真、亮度偏暗.针对这些缺陷,本文提出一种改进的White PatchRetinex算法,对原有图像去雾算法进行优化.首先,通过改进的White Patch Retinex算法计算出环境光.其次通过暗通道先验算法获得透射率.最后根据得到的环境光和透射率,求解大气散射模型,从而得到去雾后的图像.实验结果表明,该算法不仅运行时间较短,对分辨率为600×800的图像处理时间平均为5 s左右,且能解决天空区域失真问题,去雾后的图像具有较高的亮度和对比度.
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