Ubuntu 16.04编译安装最新的OpenCV3.2

• 获取源代码

$ git clone https://github.com/opencv/opencv.git

• 安装依赖库

$ sudo apt-get install -y cmake

#借助系统自带的opencv简化依赖安装步骤
$ sudo apt-get install -y libopencv-dev

• 编译源代码

$ cd opencv

$ mkdir build

$ cd build

$ cmake ..

$ make -j 10

• 替换已经安装的版本

$ sudo make install

• 编译出错的处理

如果执行cmake时候出现如下错误信息

CMake Error at CMakeLists.txt:11 (message):
  

  FATAL: In-source builds are not allowed.

         You should create separate directory for build files.



-- Configuring incomplete, errors occurred!

则应该是在代码根目录下直接执行过cmake，导致根目录下生成了CMakeCache.txt，需要删除CMakeCache.txt再次执行编译即可。