sudo make uninstall
sudo rm -rf /usr/local/share/opencv*
sudo rm -rf /usr/local/include/opencv*
sudo rm -rf /usr/local/lib/libopencv_*
sudo rm -rf /usr/local/lib/cmake/opencv4/
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1、From repository，卸载从软件仓库中安装的opencv2
sudo apt-get purge libopencv* 2、From source，卸载使用cmake自行编译安装的opencv2
sudo make uninstall
cd ..
sudo rm -r build
sudo rm -r /usr/local/include/opencv2 /usr/local/include/opencv /usr/include/opencv /usr/include/opencv2 /usr/local/share/opencv /usr/local/share/OpenCV /usr/share/opencv /usr/share/OpenCV /usr/local/bin/opencv* /usr/local/lib/libopencv*
sudo apt remove opencv-data python-opencv这一步可能有error，忽略之。最后执行如下操作：
sudo apt-get --purge remove opencv-doc opencv-data python-opencv系统中可能存在多个opencv，使用pkg-config查看安装的路径和版本
#查看已安装的版本
pkg-config --modversion opencv
#查看当前opencv信息
#pkg-config --cflags opencv
#pkg-config --libs opencv然后就重新安装吧，依赖库等也要重新安装