安装opencv和opencv_contrib （C++接口、Ubuntu 18.04）

系统	Ubuntu 18.04
OpenCV 版本	4.5.1
接口类型	C++

---

1. 安装依赖

sudo apt-get update
sudo apt-get install cmake
sudo apt-get install build-essential libgtk2.0-dev libavcodec-dev libavformat-dev libjpeg-dev libswscale-dev libtiff5-dev
sudo apt-get install libgtk2.0-dev
sudo apt-get install pkg-config

2. 下载并解压opencv-4.5.1和opencv_contrib-4.5.1

1. opencv-4.5.1.zip
   opencv_contrib-4.5.1.zip
   若要安装Python接口的，则下载opencv-python和对应版本的opencv_contrib

2. 下载完成后两个都解压，把opencv_contrib放到opencv中,opencv可以放到任意位置

opencv-4.5.1
     ├── opencv_contrib-4.5.1

3. opencv_contrib缺少的文件

点我下载，提取码: q7n7

1. 把下载后的文件拷贝到/opencv-4.5.1/opencv_contrib-4.5.1/modules/xfeatures2d/src/文件夹中
2. 将opencv-4.5.1/modules/features2d/test/下列的文件拷贝到opencv_contrib-4.5.1/modules/xfeatures2d/test/

test_descriptors_invariance.impl.hpp
test_descriptors_regression.impl.hpp
test_detectors_invariance.impl.hpp
test_detectors_regression.impl.hpp
test_invariance_utils.hpp

3. 打开文件opencv_contrib-4.5.1/modules/xfeatures2d/test/test_features2d.cpp

#include "features2d/test/test_detectors_regression.impl.hpp"
#include "features2d/test/test_descriptors_regression.impl.hpp"

改为

#include "test_detectors_regression.impl.hpp"
#include "test_descriptors_regression.impl.hpp"

4. 打开文件opencv_contrib-4.5.1/modules/xfeatures2d/test/test_rotation_and_scale_invariance.cpp

#include "features2d/test/test_detectors_invariance.impl.hpp" 
#include "features2d/test/test_descriptors_invariance.impl.hpp"

改为

#include "test_detectors_invariance.impl.hpp"
#include "test_descriptors_invariance.impl.hpp"

---

4. 开始安装

1. 打开终端，切换到opencv-4.5.1文件夹

cd opencv-4.5.1/

2. 新建文件夹release并进入

mkdir release && cd release

3. 注意: 这里要替换为你的opencv_contri/modules所在的位置
   不要漏掉后面两个点
   核对opencv的版本

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local .. -D OPENCV_EXTRA_MODULES_PATH=/home/电脑的用户名/opencv-4.5.1/opencv_contrib-4.5.1/modules ..

4. cmake后make（可能需要几十分钟）

make
sudo make install

5. 测试

1. 测试01

cd /home/czt/opencv-4.5.1/samples/cpp/example_cmake
cmake .
make
./opencv_example

显示Hello OpenCV字样，则表示成功。

2. 测试02

mkdir DisplayImage && cd DisplayImage
gedit DisplayImage.cpp

DisplayImage.cpp

#include 
#include 
using namespace cv;
int main(int argc, char** argv )
{
    if ( argc != 2 )
    {
        printf("usage: DisplayImage.out \n");
        return -1;
    }
    Mat image;
    image = imread( argv[1], 1 );
    if ( !image.data )
    {
        printf("No image data \n");
        return -1;
    }
    namedWindow("Display Image", WINDOW_AUTOSIZE );
    imshow("Display Image", image);
    waitKey(0);
    return 0;
}

touch CMakeLists.txt
gedit CMakeLists.txt

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
project( DisplayImage )
find_package( OpenCV REQUIRED )
include_directories( ${OpenCV_INCLUDE_DIRS} )
add_executable( DisplayImage DisplayImage.cpp )
target_link_libraries( DisplayImage ${OpenCV_LIBS} )

cmake .
make

找一张图片放到DisplayImage

./DisplayImage 图片名称.后缀

如：

./DisplayImage girl.jpg

6. 安装失败

可能相应的依赖库未安装，或者opencv_contrib缺失文件，参考其他作者的博客。

7. 参考资料

1. 学习OpenCV 3（书籍）
2. 安装OpenCV时提示缺少boostdesc_bgm.i文件的问题解决方案
3. 树莓派2020-02-13-raspbian-buster系统安装opencv4.2.0