libopencv_nonfree.so.2.4: cannot open shared object file: No such file or directory
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ubuntu已安装opencv3.1.0，跑网络需要用到libopencv_nonfree.so.2.4库，这个库不包含在opencv3的正常安装之中，尝试在opencv_contrib里寻找，即重装opencv3.1.0+opencv_contrib的话还是找不到库（笔者知道版本不一样，就是想看看3里面能不能找到这个库，然后重新编译代码）。
卸掉opencv3，重装opencv2的话，2和3的安装方法有区别，指定cmake里WITH_CUDA那块很容易出问题。
直接把编译好的库导进去的话，试过，不行。
stackoverflow上有这个方法：
sudo add-apt-repository --yes ppa:xqms/opencv-nonfreesudo apt-get update sudo apt-get install libopencv-nonfree-dev阅读全文
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