Ubuntu下opencv的安装与卸载

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前言

Ubuntu上我们一般需要安装opencv来完成图像处理等程序操作，下面我以opencv3.4.0在Ubuntu16.04上的安装为例进行讲解。

1. 系统自带opencv

Ubuntu16.04系统资源库自带opencv2.4.8，如果不需要用到高级功能，这点即可。其下载方法如下：

sudo apt install libopencv-dev

判断系统上是否存在opencv，可输入：

pkg-config --modversion opencv

卸载方法为:

sudo apt remove libopencv-dev

2.官网下载安装opencv

2.1 安装opencv

• Step1 卸载已有opencv

• Step2 进入Opencv官网选择对应版本source下载。

• Step3 在下载路径执行：

  if [ ! -d "opencv-3.4.0/" ];then
  unzip opencv-3.4.0.zip -d ./
  else
  echo "opencv package has been unzipped"
  fi
  
  sudo apt-get install cmake pkg-config build-essential libgtk2.0-dev libavcodec-dev libavformat-dev libjpeg.dev libtiff4.dev libswscale-dev libjasper-dev  -y
  
  cd opencv-3.4.0/
  sudo mkdir build
  cd build
  sudo make clean
  cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local  ..
  sudo make -j8
  sudo make install
  
  if [ 0 -eq $(cat /etc/ld.so.conf.d/opencv.conf | grep -c '/usr/local/lib') ] ;then
  	echo  '/usr/local/lib' >> /etc/ld.so.conf.d/opencv.conf
  fi
  
  if [ 0 -eq $(cat /etc/bash.bashrc | grep -c 'PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig') ] ;then
  	echo  'PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig' >>  /etc/bash.bashrc
  fi
  
  if [ 0 -eq $(cat /etc/bash.bashrc | grep -c 'export PKG_CONFIG_PATH') ] ;then
  	echo  'export PKG_CONFIG_PATH' >>  /etc/bash.bashrc
  fi
  
  sudo ldconfig
  sudo updatedb
  source /etc/bash.bashrc

• Step4 如果安装过程中卡在ippicv这里，可以去这里下载,然后重命名为4e0352ce96473837b1d671ce87f17359-ippicv_2017u3_lnx_intel64_general_20170822.tgz，放入opencv-3.4.0/.cache/ippicv/下，重新安装。

2.2 卸载opencv

卸载方法如下，进入下载路径：

cd opencv-3.4.0/build
sudo make uninstall
cd ../..
sudo rm -rf opencv-3.4.0/
sudo rm -rf /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* /usr/local/lib/pkgconfig
sudo rm -rf /etc/ld.so.conf.d/opencv.conf
sudo sed -i '/PKG_CONFIG_PATH/d' /etc/bash.bashrc
sudo ldconfig
sudo updatedb
cd ..
source /etc/bash.bashrc

3.python版opencv

python版本的opencv可通过pip直接下载安装，pip下载源建议设置为国内源，即在当前用户HOME目录下新建一个.pip/pip.conf文件，写入：

[global]
index-url = https://pypi.tuna.tsinghua.edu.cn/simple
[install]
trusted-host=pypi.tuna.tsinghua.edu.cn

然后下载安装python-opencv:

pip install opencv-python

卸载方式：

pip uninstall opencv-python

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