在 C# 和 WPF 中使用 Aforge.NET 獲取網路攝像頭流

我想用我的相機捕捉網路攝像頭。為此，我使用了 2 個參考：AForge.Video.dll和AForge.Video.DirectShow.dll.

這是我找到的一個片段：

public FilterInfoCollection CamsCollection;
public VideoCaptureDevice Cam = null;

void Cam_NewFrame(object sender, NewFrameEventArgs eventArgs)
{   
 frameholder.Source = (Bitmap)eventArgs.Frame.Clone(); 
 /* ^
  * Here it cannot convert implicitly from System.Drawing.Bitmap to
  * System.Windows.Media.ImageSource
  */

}

private void startcam_Click(object sender, RoutedEventArgs e)
{
 CamsCollection = new FilterInfoCollection(FilterCategory.VideoInputDevice);

 Cam = new VideoCaptureDevice(CamsCollection[1].MonikerString);
 Cam.NewFrame += new NewFrameEventHandler(Cam_NewFrame);
 Cam.Start();
}

private void stopcam_Click(object sender, RoutedEventArgs e)
{
 Cam.Stop();
}

}

他們使用 aPictureBox來顯示框架。當我在 WPF 中工作時，我使用了這個

總結一下，這就是我的程式碼目前的樣子。

public FilterInfoCollection CamsCollection;
public VideoCaptureDevice Cam = null;


void Cam_NewFrame(object sender, NewFrameEventArgs eventArgs)
{

   System.Drawing.Image imgforms = (Bitmap)eventArgs.Frame.Clone();


   BitmapImage bi = new BitmapImage();
   bi.BeginInit ();

   MemoryStream ms = new MemoryStream ();

   imgforms.Save(ms, ImageFormat.Bmp);

   ms.Seek(0, SeekOrigin.Begin);
   bi.StreamSource  = ms;
   frameholder.Source = bi; 
  /* ^ runtime error here because `bi` is occupied by another thread.
   */
   bi.EndInit();
}

private void startcam_Click(object sender, RoutedEventArgs e)
{

   CamsCollection = new FilterInfoCollection(FilterCategory.VideoInputDevice);

   Cam = new VideoCaptureDevice(CamsCollection[1].MonikerString);
   Cam.NewFrame += new NewFrameEventHandler(Cam_NewFrame);
   Cam.Start();
}

private void stopcam_Click(object sender, RoutedEventArgs e)
{
   Cam.Stop();
}

**Edit1：**有關詳細說明，請查看我關於同一主題的博文。

---

Dispatcher我使用類作為互斥鎖修復了錯誤：

void Cam_NewFrame(object sender, NewFrameEventArgs eventArgs)
   {

       System.Drawing.Image imgforms = (Bitmap)eventArgs.Frame.Clone(); 

       BitmapImage bi = new BitmapImage(); 
       bi.BeginInit(); 

       MemoryStream ms = new MemoryStream(); 
       imgforms.Save(ms, ImageFormat.Bmp); 
       ms.Seek(0, SeekOrigin.Begin); 

       bi.StreamSource = ms; 
       bi.EndInit();

       //Using the freeze function to avoid cross thread operations 
       bi.Freeze();

       //Calling the UI thread using the Dispatcher to update the 'Image' WPF control         
       Dispatcher.BeginInvoke(new ThreadStart(delegate
       {
           frameholder.Source = bi; /*frameholder is the name of the 'Image' WPF control*/
       }));     

   }

現在它按預期執行，我獲得了良好的性能，而 fps 沒有任何下降。

引用自：https://stackoverflow.com/questions/6138423