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-5));
                picWindow.Image = frame;

            }
            GC.Collect();
        }

编译运行，打开视频如图所示：