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：

 1 /// <summary>
 2         /// 点击按钮打开指定图片
 3         /// </summary>
 4         /// <param name="sender"></param>
 5         /// <param name="e"></param>
 6         private void OpenImage_Click(object sender, EventArgs e)
 7         {
 8             OpenFileDialog openFileDialog = new OpenFileDialog();
 9             if (openFileDialog.ShowDialog() == DialogResult.OK)
10             {
11                 try
12                 {
13                     capture = new Capture(openFileDialog.FileName);
14                     fps = (int)capture.GetCaptureProperty(CapProp.Fps);
15                     Application.Idle += new EventHandler(ProcessFrame);
16                 }
17                 catch (Exception exp)
18                 {   
19                     MessageBox.Show(exp.Message);
20                 }
21                
22                 
23             }
24         }
25         private void ProcessFrame(object sender, EventArgs e)
26         {
27 
28             Mat frame = capture.QueryFrame();
29             if (frame != null)
30             {
31                 //为使播放顺畅，添加以下延时
32                 System.Threading.Thread.Sleep((int)(1000.0 /fps-5));
33                 picWindow.Image = frame;
34 
35             }
36             GC.Collect();
37         }

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编译运行，打开视频如图所示：