コード例 #1
0
ファイル: EmbeddableStream.cs プロジェクト: guozanhua/parsley
 void _grabber_OnFrame(Parsley.Core.BuildingBlocks.FrameGrabber fg, Emgu.CV.Image<Emgu.CV.Structure.Bgr, byte> img) {
   // Note: This method is called from the frame-grabber's thread loop. 
   // The framegrabber holds a Breath on the camera to ensure that the camera object remains
   // alive during this callback. The camera object is a SharedResource, meaning that any
   // invocation to Dispose will block until all Breaths on the camera are released. Suppose
   // The thread that owns the picture box has called dispose and blocks. The callback here is called
   // and invoke is used. Invoke executes the delegate on thread that owns this control, which is the one
   // that is already blocked. This leads to a deadlock. That is why we use BeginInvoke, which executes
   // the delegate on the GUI thread associated with this control.
   if (_can_invoke) {
     Rectangle client = this.ClientRectangle;
     Emgu.CV.Image<Emgu.CV.Structure.Bgr, byte> img_copy = img.Resize(client.Width, client.Height, _interpolation);
     this.BeginInvoke(new MethodInvoker(delegate {
       // Update image
       Emgu.CV.IImage prev = _picture_box.Image;
       _picture_box.Image = img_copy;
       if (prev != null) {
         prev.Dispose();
       }
     }));
   }
 }