opencv3::Mat元素的获取、at、ptr

opencv3::Mat元素的获取、at、ptr 参考 http://lib.csdn.net/article/opencv/28700?knId=1218 https://blog.csdn.net/xiaowei_cqu/article/details/19839019 https://blog.csdn.net/u011574296/article/details/70139563

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