https://blog.csdn.net/dcrmg/article/details/53545510
简单灰度世界代码
https://wenku.baidu.com/view/bce7d11010a6f524ccbf8513.html
所有算法比较
https://blog.csdn.net/cy20161212/article/details/53102694
https://blog.csdn.net/yapingmcu/article/details/50637797(有写测色温曲线)
AWB算法原理
https://blog.csdn.net/real_myth/article/details/50948455
YCbCr然后有Mr