4.切换系统python版本

sudo update-alternatives --config python

5.切换系统gcc版本

sudo update-alternatives --config gcc

ubuntu16.04中的gcc版本及版本切换

5.查看opencv版本

pkg-config opencv --modversion

查看cuda版本

cat /usr/local/cuda/version.txt

或者

nvcc -V

查看cudnn版本

cat /usr/local/cuda/include/cudnn.h | grep CUDNN_MAJOR -A 2

查看prototbuf版本

protoc --version

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-get install cmake libgtk2.0-dev libavcodec-dev libavformat-dev libjpeg-dev libpng-dev libtiff-dev libtiff5-dev libswscale-dev libjasper-dev libcurl4-openssl-dev libtbb2 libdc1394-22-dev libavresample-dev libgphoto2-dev

mkdir build
cd build

cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local ..

sudo make -j4

sudo make install