平台：Windows 10 20H2
Visual Studio 2015
opencv_contrib-3.4.12

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转自【opencv七】利用opencv调用电脑摄像头 —— yuanCruise

测试程序

#include <opencv2/opencv.hpp>
#include <iostream>using namespace cv;int main()
{namedWindow("Example", WINDOW_AUTOSIZE);VideoCapture cap;cap.open(0);//VideoCapture cap(0);这句话可以替代上面两个语句，效果是一致的。if (!cap.isOpened()){std::cerr << "Couldn't open capture." << std::endl;return -1;}Mat frame;while (1){cap >> frame;if (frame.empty()) break;imshow("Example", frame);if (waitKey(33) >= 0) break;}waitKey(0);return 0;
}

实验现象