Revision history [back]

Hi all,

Just installed OpenCV yesterday and I'm trying to play around with it, to eventually work on some fun projects. At the moment I'm struggling to visualize my laptop webcam, and I can't figure out why. This is the code I'm running:

After building the project and running it, this is the error that comes up:

OpenCV(3.4.1) Error: Assertion failed (size.width>0 && size.height>0) in imshow

Thanks in advance for your help ! :)

Hi all,

Just installed OpenCV yesterday and I'm trying to play around with it, to eventually work on some fun projects. At the moment I'm struggling to visualize my laptop webcam, and I can't figure out why. This is the code I'm running:

After building the project and running it, this is the error that comes up:

OpenCV(3.4.1) Error: Assertion failed (size.width>0 && size.height>0) in imshow

Thanks in advance for your help ! :)

Hi all,

Just installed OpenCV yesterday and I'm trying to play around with it, to eventually work on some fun projects. At the moment I'm struggling to visualize my laptop webcam, and I can't figure out why. This is the code I'm running:

`int main() { VideoCapture stream1(0);

if (!stream1.isOpened()) { //check if video device has been initialised
    cout << "cannot open camera";
}



//unconditional loop
while (true) {
    Mat cameraFrame;
    stream1.read(cameraFrame);

    imshow("cam", cameraFrame);
    exit(0);
    if (waitKey(30) >= 0)
        break;
}

return 0;}`

After building the project and running it, this is the error that comes up:

OpenCV(3.4.1) Error: Assertion failed (size.width>0 && size.height>0) in imshow

Thanks in advance for your help ! :)

Hi all,

Just installed OpenCV yesterday and I'm trying to play around with it, to eventually work on some fun projects. At the moment I'm struggling to visualize my laptop webcam, and I can't figure out why. This is the code I'm running:

int main() {
    VideoCapture stream1(0);
 
stream1(0);

    if (!stream1.isOpened()) { //check if video device has been initialised
     cout << "cannot open camera";
 }

  //unconditional loop
 while (true) {
     Mat cameraFrame;
     stream1.read(cameraFrame);

     imshow("cam", cameraFrame);
     exit(0);
     if (waitKey(30) >= 0)
         break;
 }

 return 0;}`
0;
 }
 
After building the project and running it, this is the error that comes up:
 
 
OpenCV(3.4.1) Error: Assertion failed (size.width>0 && size.height>0) in imshow
 
 
Thanks in advance for your help ! :)