I would like to achieve the requirement of obtaining real-time camera feed from the currently connected camera on a Windows operating system using C++ environment. However, after multiple attempts and debugging, I have found that my computer is unable to successfully retrieve frames from the camera.
So, I wrote a simple program that aimed to accomplish one task: displaying the video feed from camera device with ID 0 on the screen. However, it failed to work as expected. I noticed that the VideoCapture video successfully opened the device with ID 0, but after executing video >> picture;, the picture object remains empty, which is quite perplexing to me.
The following is the complete code.
#include <opencv2/opencv.hpp>
#include <iostream>
using namespace cv;
using namespace std;
int main(int argc, char** argv)
{
try {
VideoCapture video;
Mat picture;
video.open(0);
if (!video.isOpened())
{
cout << "Failed to open camera" << endl;
return -1;
}
while (1)
{
video >> picture;
if (picture.empty()) {
cout << "Empty frame" << endl;
break;
}
imshow("input", picture);
if (waitKey(30) == 27)
break;
}
}
catch (const cv::Exception& e) {
cout << "OpenCV exception: " << e.what() << endl;
}
catch (const std::exception& e) {
cout << "Exception: " << e.what() << endl;
}
catch (...) {
cout << "Unknown exception occurred" << endl;
}
return 0;
}
The following is the output. enter image description here By the way, I am sure that the camera that I am trying to open exists, because I can see the light on my camera turned blue when I run the process, which means the camera is on.
I don't know how to fix it, it seems that most people can easily achieve the target when running this process, but I am not.I hope someone can help me.
