ubuntu编译opencv & eigen

一、编译Opencv

1. 下载opencv和opencv-contrib
https://github.com/opencv/opencv/archive/refs/tags/3.4.6.zip
https://github.com/opencv/opencv_contrib/archive/refs/tags/3.4.6.zip

2. 安装依赖
sudo apt-get install build-essential cmake git libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libdc1394-22-dev libgtk-3-dev libgtkglext1-dev libgstreamer1.0-dev libavresample-dev  libgphoto2-dev libopenblas-dev libatlas-base-dev doxygen libgstreamer-ocaml-dev libgstreamer-plugins-bad1.0-dev libgstreamer-plugins-base1.0-dev libgstreamer-plugins-good1.0-dev libgstreamer1.0-dev libgstreamermm-1.0-dev libtesseract-dev liblept5 libleptonica-dev liblapacke-dev libgstreamer-opencv1.0-0 libgstreamer-plugins-bad1.0-dev libgstreamer-plugins-base1.0-dev libgstreamer-plugins-good1.0-dev libgstreamerd-3-dev libgstreamermm-1.0-dev libv4l-dev libprotobuf-dev libhdf5-dev libgflags-dev python3-numpy

3. cmake
    cd opencv-3.4.6/
    mkdir release
    cd release/
    cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local/opencv346 -D OPENCV_EXTRA_MODULES_PATH=/home/zxq/code/c++/opencv_contrib-3.4.6/modules ..
结果如下

 

异常情况如下：

a.编译过程中会下载IPPICV: Download: ippicv_2019_lnx_intel64_general_20180723.tgz，由于网络问题，经常下载失败

    解决方法：

    手动下载：https://github.com/opencv/opencv_3rdparty/tree/ippicv/master_20180723/ippicv
    可放在默认的下载路径 ~/DownLoad/
    修改opencv里相关配置文件
　　或sudo wget   https://github.com/opencv/opencv_3rdparty/tree/ippicv/master_20180723/ippicv
#保存在一个路径里面，这个路径自定义即可。
vim ~/opencv/3rdparty/ippicv/ippicv.cmake #就是这个文件的路径
# 将47行的
     "https://raw.githubusercontent.com/opencv/opencv_3rdparty/${IPPICV_COMMIT}ippicv/"
# 改为步骤1中手动下载的文件的本地路径(也就是将网络下载的模式改为本地文件下载的模式):
    "file:~/Downloads/" #（仅供参考，根据自己的路径填写）

保存完后，重新cmake

cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local …

b. opencv2/core/videoio.h ,opencv constants_c.h: 没有那个文件或目录

直接在代码中注释掉即可

4. make
make -j8

5. 安装
sudo make install
 结果如下。
 右上可知，opencv被安装在/usr/local/opencv346/

6. 配置opencv的路径
    sudo gedit /etc/ld.so.conf.d/opencv.conf
    添加内容：
    /usr/local/opencv346/lib
    再sudo一下使配置路径生效
    sudo ldconfig

7. 测试
cd到opencv测试用例目录。

    cd samples
    cd cpp
    cd example_cmake
    cmake .
8.运行测试程序
    make
    ./opencv_example
结果如下。

出现这个弹窗，说明安装成功。

二、编译Eigen

Eigen官网：http://eigen.tuxfamily.org/index.php?title=Main_Page

cd eigen
mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig