I. Interface layout

  • twoButton
  • aPictureBox
  • aBackgroundWorker cameraWorker

Second, function realization

2.1 Enabling the Camera

  • Turn on the camera
  • Check whether the camera is enabled. If no, prompt is displayed and exit
  • Camera Background TaskcameraWorkerBegan to run
private void openCameraBtn_Click(object sender, EventArgs e)
{
    if (cameraWorker.IsBusy)
    {
        closeCamera();
    }
    else{ openCamera(); }}private void openCamera()
{
    capture.Open(0, VideoCaptureAPIs.ANY);
    if(! capture.IsOpened()) { Close(); MessageBox.Show("Failed to open camera.");
        return;
    }
    openCameraBtn.Text = "Turn off the camera.";
    cameraWorker.RunWorkerAsync();
}

private void closeCamera()
{
    openCameraBtn.Text = "Turn on the camera.";
    cameraWorker.CancelAsync();
    capture.Release();
    pictureBox1.Image = null;
}
Copy the code

2.2 Running Background Camera Tasks

  • whileInfinite loop
  • Obtaining a CameraframeMat
  • Converted toBitmap
  • Copy topictureBox1
private void cameraWorker_DoWork(object sender, DoWorkEventArgs e)
{
    var bgWorker = (BackgroundWorker)sender;

    while(! bgWorker.CancellationPending) {using (var frameMat = capture.RetrieveMat())
        {
            var frameBitmap = BitmapConverter.ToBitmap(frameMat);
            bgWorker.ReportProgress(0, frameBitmap);
        }
        Thread.Sleep(100); }}private void cameraWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    varframeBitmap = (Bitmap)e.UserState; pictureBox1.Image? .Dispose(); pictureBox1.Image = frameBitmap; }Copy the code

3. Exceptions are reported

System. TypeInitializationException: "" OpenCvSharp. Internal. NativeMethods" of type initializers throw an exception." Internal exception DllNotFoundException: DLL cannot be loaded "OpenCvSharpExtern" : specified module cannot be found. (Exception is from HRESULT:0x8007007E).Copy the code

Because there’s a little DLL missing

  • Click to download OpenCVSharp DL.zip
  • In theUnder the \ bin \ Debug \

Four, run,

  • perfect

Five, Demo source code

OpenCVSharpDemo project source click to download

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