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   源码介绍

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winform实时显示视频并截取图片，使用了emgucv

        public void CaptureProcess(object sender, EventArgs arg)
        {
            frame = capture.QueryFrame();
            imageBox_capture.Image = frame;
        }

        private void button_capture_start_Click(object sender, EventArgs e)
        {
            if (capture == null)
            {
                try
                {
                    capture = new Capture();
                }
                catch (NullReferenceException except)
                {
                    MessageBox.Show(except.Message);
                }
            }

            if (capture != null)
            {
                if (capture_flag)
                {
                    //Application.Idle  = new EventHandler(CaptureProcess);
                    capture_tick.Start();
                    button_capture_start.Text = "停止";
                }
                else
                {
                    //Application.Idle -= new EventHandler(CaptureProcess);
                    capture_tick.Stop();
                    button_capture_start.Text = "开始";
                }
                capture_flag = !capture_flag;
            }
        }

        private void button_capture_frame_Click(object sender, EventArgs e)
        {
            SaveFileDialog saveFileDialog = new SaveFileDialog();
            saveFileDialog.Filter = "BMP文件|*.bmp|JPG文件|*.jpg|JPEG文件|*.jpeg|所有文件|*.*";
            if (saveFileDialog.ShowDialog() == DialogResult.OK)
            {
                CvInvoke.cvSaveImage(saveFileDialog.FileName, this.frame, (IntPtr)0);
            }
        }