Ubuntu卸载opencv2.*，重新安装opencv3.*版本

一、 卸载opencv2.4.9： Going to the "build" folder directory of opencv from terminal, and execute the following：

1. $ sudo make uninstall
2. $ cd ..
3. $ sudo rm -r build
4. $ 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*

这一步可能有error
下面执行如下操作：
5. sudo apt-get –purge remove opencv-doc opencv-data python-opencv

二、 安装opencv

1. 安装依赖项（opencv网页打开太慢，自己搜吧）opencv网站  docs about opencv

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

2. 下载opencv对应版本，如opencv3.2.3

cd ~/opencv-3.2.0-rc1
mkdir release
cd release
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..
make
sudo make install

3. 安装完成后，写入opencv路径：sudo sh -c 'echo "usr/local/lib" > /etc/ld.so.conf.d/opencv.conf'
4. 更新电脑配准

sudo ldconfig

opencv官方安装教程：http://docs.opencv.org/2.4/doc/tutorials/introduction/table_of_content_introduction/table_of_content_introduction.html

opencv install in Linux  ：http://docs.opencv.org/2.4/doc/tutorials/introduction/linux_install/linux_install.html#linux-installation

PS：

Ubuntu下关于安装opencv3.x时一直downloading protobuf-cpp-3.1的问题

1.将protobuf-cpp-3.1.0.tar.gz下载下来,下载地址:

http://download.csdn.net/detail/specialshoot/9753560

2.按照下载页面上的提示操作即可,我把方法直接写在提示上了,千万不要自己编译安装protobuf这个tar.gz文件,编译时间很长,然后并没有什么卵用,按照提示做,一会儿就好了!

附录:ubuntu中安装多个版本OpenCV的方法:

http://blog.csdn.net/haizimin/article/details/53731226

make 时error:

/Users/ajx/Downloads/opencv/opencv_contrib/modules/rgbd/src/odometry.cpp:41:10: fatal error: 'unsupported/Eigen/MatrixFunctions' file not found
#include <unsupported/Eigen/MatrixFunctions>

解决办法：

sudo apt-get install libeigen3-dev //默认安装路径是：/usr/include/eigen3

sudo cp -r /usr/include/eigen3/unsported /usr/local/include/

参考：http://blog.csdn.net/jay463261929/article/details/53580538 opencv/modules/highgui/src/window_gtk.cpp:49:21: fatal error: gtk/gtk.h: 没有这个文件或文件夹解决方法：在编译指令中加入 -D WITH_GTK=OFF (会引起显示问题）

cmake -D CMAKE_BUILD_TYPE=Release -D OPENCV_EXTRA_MODULES_PATH=~/opencv/opencv_contrib/modules/ -D CMAKE_INSTALL_PREFIX=/usr/local ../opencv

编译opencv_contrib模块参考：http://blog.csdn.net/ycl295644/article/details/52262369

Ubuntu卸载opencv2.，重新安装opencv3.版本

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