2、opencv2.4.13.6安装

一、 卸载opencv3.3.0： 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，去CSDN下载opencv3.0.0和ippicv_linux_20141027.tgz（http://download.csdn.net/detail/yunlong782/8940743）。

install essential packages

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

使用cmake-gui安装，首先安装cmake和cmake-qt-gui
1. $ sudo apt-get install cmake cmake-qt-gui
2. 解压opencv3.0.0，并进入目录，建立build目录并进去build目录打开终端，并输入：$ cmake-gui

三、CMake编译opencv

通过cmake-gui命令启动cmake。

/work/systems/OpenCV-2.0.0/为OpenCV的安装包目录

/work/systems/OpenCVARM/用于生成Makefile的存储。

然后点击Configure按钮，选择为Unix Makefiles，选择Specify options for cross-compiling，点击Next

配置交叉编译器

配置前

配置后

之前arm-linux-gcc-4.3.2被安装到了/usr/local/arm/4.3.2/bin目录下。

然后点击Generate按钮生成Makefile；

四、编译

（1）进入之前Makefile的目录，即之前配置的/work/systems/OpenCVARM目录。

（2）编译：cd  /work/systems/OpenCVARM

编译命令：su//切换到root权限

　　　　　　$sudo  make

出错如下：

1、opencv-2.4.13.6/modules/core/src/drawing.cpp:1015: error: call of overloaded 'abs(long long int&)' is ambiguous
把abs改为fabs

2、drawing.cpp:1023: error: integer constant is too large for 'long' type
出错的数据后面加上LL，eg：test = 0x0008888000000000LL

3、

解决方法：修改CMakeCache.txt，CMAKE_EXE_LINKER_FLAGS原来为空，加上-lpthread  -lrt -ldl，

五、make install

(还需要把/usr/local/arm/下的lib和include复制到/usr/local/arm/4.3.2/arm-none-linux-gnueabi下面去，好像是在那篇文章中看到的)

修改/etc/bash.bashrc添加
export PATH=$PATH:/usr/local/arm/4.3.2/bin
PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/arm/lib/pkgconfig
export PKG_CONFIG_PATH

修改/etc/ld.so.conf添加
/usr/local/arm/lib