Linux 完全卸载重装opencv

一、完全卸载opencv

1. 先到opencv编译安装的目录下

sudo make uninstall
cd ..
sudo rm -r build

2.上面最后一行命令有的文件夹不存在会有提示，但是不影响，只要把已安装的opencv的include和lib删掉就行，也可以手动删除，总之删除干净即可。

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*

3.检查是否删除完

pkg-config opencv --libs
pkg-config opencv --modversion

4.清除干净

sudo apt-get autoremove opencv-doc opencv-data libopencv-dev libopencv2.4-java 
 libopencv2.4-jni python-opencv libopencv-core2.4 libopencv-gpu2.4 libopencv-ts2.4 
 libopencv-photo2.4 libopencv-contrib2.4 libopencv-imgproc2.4 libopencv-superres2.4 
 libopencv-stitching2.4 libopencv-ocl2.4 libopencv-legacy2.4 libopencv-ml2.4 libopencv- 
 video2.4 libopencv-videostab2.4 libopencv-objdetect2.4 libopencv-calib3d2.4

二、重新安装opencv

1.官网下载对应版本的source：https://opencv.org/releases/

2.更新安装依赖库

sudo apt-get install build-essential
sudo apt-get install cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev
sudo apt-get install python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libjasper-dev libdc1394-22-dev

3.编译并安装

cd opencv
mkdir build
cd build
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local .. 
make -j
sudo make install

安装时间会比较长，要耐心等待！

三、配置环境变量

将opencv的库加入路径

sudo gedit /etc/ld.so.conf/opencv.conf

此时在打开的文件中加入/usr/loacl/lib，保存退出

sudo ldconfig
sudo gedit /etc/bash.bashrc 

此时在打开的文件末尾加入PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig export PKG_CONFIG_PATH，保存退出

source /etc/bash.bashrc

4.检验

pkg-config opencv --modversion

至此opencv的安装就完成了

四、解决错误提示

1.因之前的版本没完全删除干净，会残留一些lib或者include导致重新安装时相应的目录文件不可用。参考上文中彻底删除opencv文件

2.安装依赖库时（第三句指令），发生错误

下列软件包有未满足的依赖关系：
 libopencv-dev : 依赖: libopencv-calib3d2.4v5 但是它将不会被安装
                 依赖: libopencv-highgui2.4v5 但是它将不会被安装
                 依赖: libopencv-ml2.4v5 但是它将不会被安装
                 依赖: libopencv-objdetect2.4v5 但是它将不会被安装
                 依赖: libopencv-core-dev (= 2.4.9.1+dfsg-1.5ubuntu1xqms2~xenial1) 但是 2.4.9.1+dfsg-1.5ubuntu1.1 正要被安装
                 依赖: libopencv-ml-dev (= 2.4.9.1+dfsg-1.5ubuntu1xqms2~xenial1) 但是它将不会被安装
                 依赖: libopencv-imgproc-dev (= 2.4.9.1+dfsg-1.5ubuntu1xqms2~xenial1) 但是 2.4.9.1+dfsg-1.5ubuntu1.1 正要被安装
                 依赖: libopencv-video-dev (= 2.4.9.1+dfsg-1.5ubuntu1xqms2~xenial1) 但是它将不会被安装
                 依赖: libopencv-objdetect-dev (= 2.4.9.1+dfsg-1.5ubuntu1xqms2~xenial1) 但是它将不会被安装
                 依赖: libopencv-highgui-dev (= 2.4.9.1+dfsg-1.5ubuntu1xqms2~xenial1) 但是它将不会被安装
                 依赖: libopencv-calib3d-dev (= 2.4.9.1+dfsg-1.5ubuntu1xqms2~xenial1) 但是它将不会被安装
                 依赖: libopencv-flann-dev (= 2.4.9.1+dfsg-1.5ubuntu1xqms2~xenial1) 但是 2.4.9.1+dfsg-1.5ubuntu1.1 正要被安装
                 依赖: libopencv-features2d-dev (= 2.4.9.1+dfsg-1.5ubuntu1xqms2~xenial1) 但是 2.4.9.1+dfsg-1.5ubuntu1.1 正要被安装
E: 无法修正错误，因为您要求某些软件包保持现状，就是它们破坏了软件包间的依赖关系。

解决：源文件过时，添加新的源文件

deb http://cn.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse

然后执行sudo apt-get update即可。