(4opencv)如何基于GOCW，创建一个实时视频程序

  //选择视频设备
        public void InitVideoDevice()
        {
            try
            {
                if (cam != null)
                    cam.Dispose();
                //读取参数
                int VIDEODEVICE = 1; // zero based index of video capture device to use
                const int VIDEOWIDTH = 640;// 是用默认（最大）分辨率
                const int VIDEOHEIGHT = 480; // Depends on video device caps
                const int VIDEOBITSPERPIXEL = 24; // BitsPerPixel values determined by device
                cam = new Capture(VIDEODEVICE, VIDEOWIDTH, VIDEOHEIGHT, VIDEOBITSPERPIXEL, picPreview  );
            }
            catch
            {
                MessageBox.Show("摄像头打开错误，请首先确保摄像头连接并至少支持1024*768分辨率！");
            }
        }

 private void timer_Tick(object sender, EventArgs e)
        {
            // Release any previous buffer
            if (m_ip != IntPtr.Zero)
            {
                Marshal.FreeCoTaskMem(m_ip);
                m_ip = IntPtr.Zero;
            }
            // capture image
            try
            {
                m_ip = cam.Click();
            }
            catch
            {
                //do nothing,允许丢帧 TODO：是否改成继承上一帧更好
            }
            Bitmap b = new Bitmap(cam.Width, cam.Height, cam.Stride, PixelFormat.Format24bppRgb, m_ip);
            // If the image is upsidedown
            b.RotateFlip(RotateFlipType.RotateNoneFlipY);
            srcImage = b;
            if (picPreview.Image != null)
                picPreview.Image.Dispose();
            //调用clr+opencv图像处理模块
            MemoryStream ms = new MemoryStream();
            b.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
            byte[] bytes = ms.GetBuffer();
            Bitmap bitmap = client.testMethod(bytes);
            //显示结果
            picPreview.Image = bitmap;
        }