M1맥 기준으로 작성되었습니다. homebrew 경로는 본인 맥에 맞게 바꿔서 넣기를

OpenCV 설치

brew install opencv

Dependency들 많아서 조금 걸림

OpenCV Library & Header 추가

Header & Library 추가

Targets - Build Settings에서 다음과 같이 설정

Setting	경로
Library Search Path	/opt/homebrew/Cellar/opencv/버전명/lib
Header Search Path	/opt/homebrew/Cellar/opencv/버전명/include/opencv4

Disable Library Validation

Disable Library Validation 항목 체크해줄것
이거 안하면 라이브러리 못불러온다고 에러남

카메라 쓰면 그 밑에 Resource Access에서 Camera도 켜줄것!! Info.plist 만들고 할 필요 없습니다

OpenCV pkg-config 플래그 확인 & 추가

$ pkg-config --cflags --libs /opt/homebrew/Cellar/opencv/버전명/lib/pkgconfig/opencv4.pc

전 이렇게 나왔음

-I/opt/homebrew/opt/opencv/include/opencv4 -L/opt/homebrew/opt/opencv/lib -lopencv_gapi -lopencv_stitching -lopencv_alphamat -lopencv_aruco -lopencv_barcode -lopencv_bgsegm -lopencv_bioinspired -lopencv_ccalib -lopencv_dnn_objdetect -lopencv_dnn_superres -lopencv_dpm -lopencv_face -lopencv_freetype -lopencv_fuzzy -lopencv_hfs -lopencv_img_hash -lopencv_intensity_transform -lopencv_line_descriptor -lopencv_mcc -lopencv_quality -lopencv_rapid -lopencv_reg -lopencv_rgbd -lopencv_saliency -lopencv_sfm -lopencv_stereo -lopencv_structured_light -lopencv_phase_unwrapping -lopencv_superres -lopencv_optflow -lopencv_surface_matching -lopencv_tracking -lopencv_highgui -lopencv_datasets -lopencv_text -lopencv_plot -lopencv_videostab -lopencv_videoio -lopencv_viz -lopencv_wechat_qrcode -lopencv_xfeatures2d -lopencv_shape -lopencv_ml -lopencv_ximgproc -lopencv_video -lopencv_xobjdetect -lopencv_objdetect -lopencv_calib3d -lopencv_imgcodecs -lopencv_features2d -lopencv_dnn -lopencv_flann -lopencv_xphoto -lopencv_photo -lopencv_imgproc -lopencv_core

Setting	경로
Other Linker Flags	위에 저거 복붙하기

Test

코드는 https://docs.opencv.org/4.x/d8/dfe/classcv_1_1VideoCapture.html 에서 베껴옴
devideID는 적당히 바꿔가면서 올바르게 넣어보도록 한다
전 1번 나옴

#include <opencv2/core.hpp>
#include <opencv2/videoio.hpp>
#include <opencv2/highgui.hpp>
#include <iostream>

using namespace cv;
using namespace std;
int main(int, char**)
{
    Mat frame;
    //--- INITIALIZE VIDEOCAPTURE
    VideoCapture cap;
    // open the default camera using default API
    // cap.open(0);
    // OR advance usage: select any API backend
    int deviceID = 1;             // 0 = open default camera
    int apiID = CAP_ANY;      // 0 = autodetect default API
    // open selected camera using selected API
    cap.open(deviceID, apiID);
    // check if we succeeded
    if (!cap.isOpened()) {
        cerr << "ERROR! Unable to open camera\n";
        return -1;
    }
    //--- GRAB AND WRITE LOOP
    cout << "Start grabbing" << endl
        << "Press any key to terminate" << endl;
    for (;;)
    {
        // wait for a new frame from camera and store it into 'frame'
        cap.read(frame);
        // check if we succeeded
        if (frame.empty()) {
            cerr << "ERROR! blank frame grabbed\n";
            break;
        }
        // show live and wait for a key with timeout long enough to show images
        imshow("Live", frame);
        if (waitKey(5) >= 0)
            break;
    }
    // the camera will be deinitialized automatically in VideoCapture destructor
    return 0;
}

잘된다!