### 系统环境配置(编译OpenCV)

* 安装 software-properties-common

```
apt install software-properties-common -y
```

* 添加软件源

```
add-apt-repository "deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ xenial-security main"
add-apt-repository "deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ xenial main multiverse restricted universe"
```

* 软件源更新

```
apt update
```

* 升级

```
apt upgrade
```

* 安装build-essential、cmake、git和pkg-config

```
apt install build-essential cmake git pkg-config -y
```

* 出现错误:

![错误信息](../../.image/CC706F1B-4AE8-477D-8275-52AC498D1966.png)

```
mv /var/lib/dpkg/info/ /var/lib/dpkg/info_old/
mkdir /var/lib/dpkg/info/
apt update
apt -f install
apt autoremove -y
```

* 安装jpeg格式图像工具包

```
apt-get install libjpeg8-dev -y
```


* 安装tif格式图像工具包

```
apt-get install libtiff5-dev -y
```

* 安装JPEG-2000图像工具包

```
apt install libjasper1 libjasper-dev
```

* 安装png图像工具包

```
apt-get install libpng-dev -y
```

* 安装视频 I/O 包

```
apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev -y
```

* 安装 gtk2.0，这一步比较麻烦，如果一直无法安装成功可尝试将apt-get切换为国内镜像源
```
apt-get install libgtk2.0-dev -y
```

* 安装优化函数包
```
apt-get install libatlas-base-dev gfortran -y
```

<!-- apt install libblas-dev
apt install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev -y
apt install libdc1394-22-dev -y -->

* 解压
```
tar -xvf opencv-3.4.12.tar
cd opencv-3.4.12/
mkdir build
cd build
```

* 配置CMake

```
cmake -D CMAKE_BUILD_TYPE=RELEASE 	\
    -D OPENCV_GENERATE_PKGCONFIG=ON \
    -D BUILD_PNG=NO \
    -D BUILD_JASPER=NO \
    -D BUILD_TIFF=NO \
    -D WITH_PNG=NO \
    -D WITH_JASPER=NO \
    -D WITH_TIFF=NO \
    -D WITH_GSTREAMER=ON \
    -D OPENCV_EXTRA_MODULES_PATH=../opencv_contrib/modules \
    -D CMAKE_INSTALL_PREFIX=install ..
```

* 编译
```
make -j4
```

* 安装
```
make install
```

* 配置环境变量
```
vim /etc/ld.so.conf
```

* 在末尾添加 OpenCV 的 lib 路径
```
/usr/local/lib
```

*  更新
```
ldconfig
```

* 查看 OpenCV 版本，验证是否配置正确
```
pkg-config --modversion opencv
```