基于L*a*b*色彩空间的自动白平衡算法

针对数码相机自动白平衡不准确、色彩还原不够真实的问题,提出了一种基于L*a*b*色彩空间的自动白平衡算法.该算法通过色彩空间转换,先将sRGB图像转换至L*a*b*色彩空间；然后,在L*a*b*色彩空间利用灰度世界模型对a*,b*色彩分量进行颜色校正；最后将L*a*b*图像转换至sRGB色彩空间.试验结果表明:在L*a*b*色彩空间对图像进行自动白平衡能获得较好的色彩还原效果.

Automatic White Balance Algorithm Based on L*a*b* Color Space

For the problem of the inaccurate automatic white balance of digital camera and the color reproduction is not true, an automatic white balance algorithm is proposed based on the L*a*b* color space. The algorithm according to the color space conversion, first converts sRGB picture to L*a*b* color space; then using grey world model executes color collection for color components of a* and b* in the L*a*b* color space; finally converts L*a*b* picture to sRGB color space. Experimental results show that the automatic white balance for images in the L*a*b* color space obtains good effect of color reproduction.