Opecv Mac Installation.md

Installing OpenCV on Mac for C++

Step 1 – Install Homebrew

https://brew.sh/
Go to the website and copy the link and paste in the terminal to install.

Step 2 – Install Opencv

  Go to terminal and type 
  brew install opencv

Step 3 – Create New Xcode Project

  Open X code and create a "macOS" - "Command Line Tool" - "C++"

Step 4 – Add Dynamic Libraries

  Right Click Project folder and "Add Files to ..."
  Press forward slash "/" on keyboard to type the folder path
  /usr/local/Cellar/opencv
  open your version folder and go to lib and select all Dynamic Libraries 

Step 5 – Add Header Search Path

  Select your project folder and go to "Build settings"
  Select All and Combined 
  Search for "Header Search Paths" 
  Double click and enter the path (make sure to change your version)
  /usr/local/Cellar/opencv/4.5.0_5/include/opencv4
  make it recursive

Step 6 – To enable Resources folder access

 Edit Scheme 
 check "Use custom working director" 
 Select your project folder

Test Code

   #include <opencv2/imgcodecs.hpp>
   #include <opencv2/highgui.hpp>
   #include <opencv2/imgproc.hpp>
   #include <iostream>

   using namespace cv;
   using namespace std;


   /////////////////  Images  //////////////////////

   int main() {

       string path = "Resources/test.png";
       Mat img = imread(path);
       imshow("Image", img);
       waitKey(0);
       return 0;
   }

Step 7 – To enable Camera Access

File - New - File
Select "Property List" in "Resources"

Add new
Item: NSCameraUsageDescription
Value: $(PRODUCT_NAME) camera use 

Open Products folder and right click on the file with your project name and 
show in finder. 

Drag your info.plist file to this folder. 

Tesr Code

  #include <opencv2/imgcodecs.hpp>
  #include <opencv2/highgui.hpp>
  #include <opencv2/imgproc.hpp>
  #include <iostream>

  using namespace cv;
  using namespace std;

  ///////////////// Webcam //////////////////////

  int main() {

       VideoCapture cap(1);
       Mat img;

       while (true) {

       cap.read(img);
       imshow("Image", img);
       waitKey(1);

   }
    return 0;
   }