OpenCvSharp 一些示例代码

2022-09-16 乐帮网

opencv

直接上代码：

  public void Run()
        {
            var capture = new VideoCapture();
            capture.Set(CaptureProperty.FrameWidth, 640);
            capture.Set(CaptureProperty.FrameHeight, 480);
            capture.Open(-1);
            if (!capture.IsOpened())
                throw new Exception("capture initialization failed");

            var fs = FrameSource.CreateCameraSource(-1);
            var sr = SuperResolution.CreateBTVL1();
            sr.SetInput(fs);

            using (var normalWindow = new Window("normal"))
            using (var srWindow = new Window("super resolution"))
            {
                var normalFrame = new Mat();
                var srFrame = new Mat();
                while (true)
                {
                    capture.Read(normalFrame);
                    sr.NextFrame(srFrame);
                    if (normalFrame.Empty() || srFrame.Empty())
                        break;
                    normalWindow.ShowImage(normalFrame);
                    srWindow.ShowImage(srFrame);
                    Cv2.WaitKey(100);
                }
            }
        }

private void workerDoReadVideo(object sender, DoWorkEventArgs e)
        {
            using (var capture = new VideoCapture(@"..\..\Videos\drop.avi"))
            {
                var interval = (int)(1000 / capture.Fps);
 
                using (var image = new Mat())
                {
                    while (_worker != null && !_worker.CancellationPending)
                    {
                        capture.Read(image);
                        if (image.Empty())
                        {
                            break;
                        }
 
                        _worker.ReportProgress(0, image);
                        Thread.Sleep(interval);
                    }
                }
            }
        }

private static double getFps(VideoCapture capture)
        {
            using (var image = new Mat())
            {
                while (true)
                {
                    /* start camera */
                    capture.Read(image);
                    if (!image.Empty())
                    {
                        break;
                    }
                }
            }
 
            using (var image = new Mat())
            {
                double counter = 0;
                double seconds = 0;
                var watch = Stopwatch.StartNew();
                while (true)
                {
                    capture.Read(image);
                    if (image.Empty())
                    {
                        break;
                    }
 
                    counter++;
                    seconds = watch.ElapsedMilliseconds / (double)1000;
                    if (seconds >= 3)
                    {
                        watch.Stop();
                        break;
                    }
                }
                var fps = counter / seconds;
                return fps;
            }
        }

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