只是做一份歸檔。如有不當(dāng)之處請大佬們指正，謝謝！

前置條件：homebrew,Xcode

1. 安裝pkg-config

   brew install pkg-config
   

2. 安裝opencv

   brew install opencv

   測試是否安裝完成：pkg-config --cflags --libs opencv

   ??? 2.1 此時您可能會出現(xiàn)下面的錯誤：

   ??? Package opencv was not found in the pkg-config search path.
   ??? Perhaps you should add the directory containing `opencv.pc'
   ??? to the PKG_CONFIG_PATH environment variable
   ??? No package 'opencv' found

   ??? 你先別急：原因是缺失了opencv.pc這個配置信息文件，故解決方法就是添加這個文件然后將其導(dǎo)入到環(huán)境變量中。

   ??????? 2.1.1解決方案：先創(chuàng)建opencv.pc文件，這里要注意它的路徑信息：

   ??????? cd /usr/local/lib
   ??????? sudo mkdir pkgconfig
   ??????? cd pkgconfig
   ??????? sudo touch opencv.pc
   
   ??????? 然后在opencv.pc中添加以下信息，注意這些信息需要與自己安裝opencv時的庫路徑對應(yīng)：

   ??????? prefix=/usr/local
   ??????? exec_prefix=${prefix}
   ??????? includedir=${prefix}/include
   ??????? libdir=${exec_prefix}/lib
   
   ??????? Name: opencv
   ??????? Description: The opencv library
   ??????? Version:4.8.0
   ??????? Cflags: -I${includedir}/openCV4
   ??????? Libs: -L${libdir} -lopencv_shape -lopencv_stitching -lopencv_objdetect -lopencv_superres -lopencv_videostab -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs -lopencv_video -lopencv_photo -lopencv_ml -lopencv_imgproc -lopencv_flann? -lopencv_core
   ?~????????????????????????????????????????????? ?
   ??????? 保存退出，然后將文件導(dǎo)入到環(huán)境變量：

   ??????? export? PKG_CONFIG_PATH=/usr/local/lib/pkgconfig

   ??????? 之后執(zhí)行pkg-config --cflags --libs opencv檢驗

由于是用C++并且筆者想在終端中直接使用，所以需要ln -s /usr/local/include/openCV4/openCV2 openCV2

默認(rèn)情況下，通過brew安裝的opencv目錄于：/usr/local/Cellar/opencv

如果想在終端下使用，所以需要建立軟連接

注意："OpenCV 4.x+ requires enabled C++11 support"


3. 下面給出測試

   測試來自opencv官方例程的代碼文件

   #include "openCV2/core.hpp"
   #include "openCV2/imgproc.hpp"
   #include "openCV2/highgui.hpp"
   #include "openCV2/videoio.hpp"
   #include <iostream>
   
   using namespace cv;
   using namespace std;
   
   void drawText(Mat & image);
   
   int main()
   {
   ??? cout << "Built with OpenCV " << CV_VERSION << endl;
   ??? Mat image;
   ??? VideoCapture capture;
   ??? capture.open(0);
   ??? if(capture.isOpened())
   ??? {
   ??????? cout << "Capture is opened" << endl;
   ??????? for(;;)
   ??????? {
   ??????????? capture >> image;
   ??????????? if(image.empty())
   ??????????????? break;
   ??????????? drawText(image);
   ??????????? imshow("Sample", image);
   ??????????? if(waitKey(10) >= 0)
   ??????????????? break;
   ??????? }
   ??? }
   ??? else
   ??? {
   ??????? cout << "No capture" << endl;
   ??????? image = Mat::zeros(480, 640, CV_8UC1);
   ??????? drawText(image);
   ??????? imshow("Sample", image);
   ??????? waitKey(0);
   ??? }
   ??? return 0;
   }
   
   void drawText(Mat & image)
   {
   ??? putText(image, "Hello OpenCV",
   ??????????? Point(20, 50),
   ??????????? FONT_HERSHEY_COMPLEX, 1, // font face and scale
   ??????????? Scalar(255, 255, 255), // white
   ??????????? 1, LINE_AA); // line thickness and type
   }
   
   

4. g++ example.cpp -o example.o -c -Wall -I/usr/local/include/openCV4 -std=c++11
   

5. g++ example.o -o opencv_example -L/usr/local/lib -lopencv_shape -lopencv_stitching -lopencv_objdetect -lopencv_superres -lopencv_videostab -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs -lopencv_video -lopencv_photo -lopencv_ml -lopencv_imgproc -lopencv_flann -lopencv_core