浅入浅出EmguCv（三）EmguCv打开指定视频

打开视频的思路跟打开图片的思路是一样的，只不过视频是由一帧帧图片组成，因此，打开视频的处理程序有一个连续的获取图片并逐帧显示的处理过程。GUI同《浅入浅出EmguCv（二）EmguCv打开指定图片》一样，只不过处理程序编程如下所示：

 /// <summary>
         /// 点击按钮打开指定图片
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         private void OpenImage_Click(object sender, EventArgs e)
         {
             OpenFileDialog openFileDialog = new OpenFileDialog();
             if (openFileDialog.ShowDialog() == DialogResult.OK)
             {
                 try
                 {
                     capture = new Capture(openFileDialog.FileName);
                     fps = (int)capture.GetCaptureProperty(CapProp.Fps);
                     Application.Idle += new EventHandler(ProcessFrame);
                 }
                 catch (Exception exp)
                 {
                     MessageBox.Show(exp.Message);
                 }

             }
         }
         private void ProcessFrame(object sender, EventArgs e)
         {

             Mat frame = capture.QueryFrame();
             if (frame != null)
             {
                 //为使播放顺畅，添加以下延时
                 System.Threading.Thread.Sleep((int)(1000.0 /fps-));
                 picWindow.Image = frame;

             }
             GC.Collect();
         }

编译运行，打开视频如图所示：