【环境】超简单版 Linux的OpenCV安装

简单安装

• 安装依赖

sudo apt-get install libopencv-dev python-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-dev

• 下载opencv，https://opencv.org/releases/，下载source

• 解压文件，打开终端
  
• 安装

cd opencv-4.5.4
mkdir build
cd build
# 配置
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..
# 编译
make -j7
# 安装到系统目录
sudo make install

查看版本

pkg-config opencv --modversion

报错

• 依赖安装失败
  参考 https://blog.youkuaiyun.com/GanSir_Auto/article/details/103655984

• ‘CODEC_FLAG_GLOBAL_HEADER’ was not declared in this scope
  https://blog.youkuaiyun.com/guo_lei_lamant/article/details/81568346

在 opencv/modules/videoio/src/cap_ffmpeg_impl.hpp 里最顶端添加了：

#define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
#define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
#define AVFMT_RAWPICTURE 0x0020