代码例子：http://blog.csdn.net/lql0716/article/details/52628959
灰度梯度https://baike.baidu.com/item/%E7%81%B0%E5%BA%A6%E6%A2%AF%E5%BA%A6/20869994?fr=aladdin
矩阵乘法http://www.ruanyifeng.com/blog/2015/09/matrix-multiplication.html
csdn分析http://blog.csdn.net/lwzkiller/article/details/54633670
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