一种暗通道优先的快速自动白平衡算法

An automatic white balance method via dark channel prior

针对目前自动白平衡算法中存在的白色区域检测错误导致白平衡失效的问题,本文提出了一种基于暗通道优先的白平衡算法。首先估计光线透射率,然后根据光线透射率来提取白色区域,去除掉高饱和度的区域。最后为了校正颜色并保证图像亮度不变化,在CIE-XYZ颜色空间相对于亮度通道Y来计算校正增益。实验表明,本文的算法和现有的一些经典算法相比,在主观视觉和客观评价上都取得了较好的效果,且在嵌入式设备上速率大于150 frames/s。

In order to overcome the problem that white balance failure caused by white region detection error in automatic white balance,this paper proposes a white balance method based on dark channel prior.First,get the dark channel image,then extract the white region in the image according to the dark channel,and then remove the region with high saturation.Finally,in order to correct the color and ensure that the image brightness does not change,we calculate the correction gain in the CIE-XYZ color space relative to the luminance channel Y.Experimental results show that our algorithm has achieved good results both in subjective and objective evaluation compared with some classical algorithms,and the rate is greater than 150 frames/s on embedded devices.