测试小工具1:同时打开多个相机（多线程）

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当电脑与多台相机设备相连接时，需要打开多个相机进行图像信息的采集。下面使用两个线程打开两个摄像头。

#include <windows.h>#include <stdio.h>#include <opencv2/opencv.hpp>#include<iostream>using namespace cv;using namespace std;DWORD WINAPI ThreadProc1(LPVOID lpParameter);DWORD WINAPI ThreadProc2(LPVOID lpParameter);int main(){HANDLE handle1 = CreateThread(NULL, 0, ThreadProc1, NULL, 0, NULL);HANDLE handle2 = CreateThread(NULL, 0, ThreadProc2, NULL, 0, NULL);CloseHandle(handle1);CloseHandle(handle2);system("pause");return 0;}DWORD WINAPI ThreadProc1(LPVOID lpParameter){VideoCapture cap0;Mat frame0;cap0.open(0);//Sleep(2000);cap0.set(CV_CAP_PROP_FRAME_WIDTH, 640);cap0.set(CV_CAP_PROP_FRAME_HEIGHT, 480);if (!cap0.isOpened()){cout << "camera0 open failed!" << endl;}while (true){cap0.grab();cap0.read(frame0);if (frame0.empty()){cout << "Camera0 grab frame failed!" << endl;}else{imshow("Video0", frame0);}if (waitKey(30) == 27)break;}return 0;}DWORD WINAPI ThreadProc2(LPVOID lpParameter){VideoCapture cap1;Mat frame1;cap1.open(1);//Sleep(2000);cap1.set(CV_CAP_PROP_FRAME_WIDTH, 640);cap1.set(CV_CAP_PROP_FRAME_HEIGHT, 480);if (!cap1.isOpened()){cout << "camera1 open failed!" << endl;}while (true){cap1.grab();cap1.read(frame1);if (frame1.empty()){//Sleep(2000);cout << "Camera1 grab frame failed!" << endl;}else{imshow("Video1", frame1);}if (waitKey(30) == 27)break;}return 0;}

效果图：

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