Emgu.cv WPF 绑定失败

Question

我正在尝试从摄像头捕获视频并以 c# WPF 格式显示。但是当我启动程序时图像不显示。调试器也不例外，它只是运行。我正在调试，我看到 CapturedImage 属性正在按预期获取数据。可能是他们在不同的线程中工作。但我想不通。所以，帮帮我，

我正在绑定 ImageSource 类型属性。如您所见，

public class VideoCapturing : INotifyPropertyChanged
{
    private ImageSource capturedImage;
    public ImageSource CapturedImage
    {
        get { return capturedImage;  }
        set { capturedImage = value; OnPropertyChanged("CapturedImage"); }
    }

捕获代码也在这里，

public void run()
    {
        if (cap.capture == null)
        {
            capture = new Emgu.CV.VideoCapture(0);
            CurrentFrame = new Mat();
             
        }
        capture.ImageGrabbed += VideoCapture_ImageGrabbed;
        capture.Start();
       
    }
private void VideoCapture_ImageGrabbed(object sender, EventArgs e) // runs in worker thread
    {
       capture.Retrieve(CurrentFrame);
       CapturedImage = ImageSourceFromBitmap(CurrentFrame.ToImage<Emgu.CV.Structure.Bgr, byte>().ToBitmap()); 
    } 
} // VideoCapturing class ends.

这里是绑定的xaml部分，

<Grid>
    <Image x:Name="img" Source="{Binding CapturedImage}"></Image> 
</Grid>

这是mainwindow.xaml.cs,

public MainWindow()
    {
        InitializeComponent(); 
        VideoCapturing VideoCapture = new VideoCapturing();
        this.DataContext = VideoCapture ;
        VideoCapture.run();
    }

Answer 1

您调用OnPropertyChanged()时有错别字。 "CaptureImage" 但应该是 "CapturedImage".

public ImageSource CapturedImage
{
    get { return capturedImage;  }
    set { capturedImage = value; OnPropertyChanged("CapturedImage"); }
}

在 MainWindow 中你应该调用 VideoCapture.run() 而不是 capture.run()。

因为 VideoCapture_ImageGrabbed 在工作线程中运行，您通过调用 Dispatcher.BeginInvoke.

在 UI 线程上设置了 CapturedImage

private void VideoCapture_ImageGrabbed(object sender, EventArgs e)
{
    capture.Retrieve(CurrentFrame);
    Application.Current.Dispatcher.BeginInvoke(new Action(() =>
    {
        CapturedImage = ImageSourceFromBitmap(CurrentFrame.ToImage<Emgu.CV.Structure.Bgr, byte>().ToBitmap()); 
    }));
}

Emgu.cv WPF 绑定失败

Emgu.cv binding failure in WPF

c#

wpf

emgucv