c# 远程监控（2） 摄像头调研

namespace CameraCapture
{
    public partial class CameraCapture : Form
    {
        private readonly Capture _capture;
        private bool _captureInProgress;

        public CameraCapture()//构造函数
        {
            InitializeComponent();
            try
            {
                _capture = new Capture();//构造一个摄像头实例
                _capture.ImageGrabbed += ProcessFrame;//图像捕捉事件
            }
            catch (NullReferenceException excpt)
            {
                MessageBox.Show(excpt.Message);
            }
        }

        private void ProcessFrame(object sender, EventArgs arg)
        {
            Image<Bgr, Byte> frame = _capture.RetrieveBgrFrame();//获取视频帧

            Image<Gray, Byte> grayFrame = frame.Convert<Gray, Byte>();
            Image<Gray, Byte> smallGrayFrame = grayFrame.PyrDown();
            Image<Gray, Byte> smoothedGrayFrame = smallGrayFrame.PyrUp();
            Image<Gray, Byte> cannyFrame = smoothedGrayFrame.Canny(100, 60);

            captureImageBox.Image = frame;
            grayscaleImageBox.Image = grayFrame;
            smoothedGrayscaleImageBox.Image = smoothedGrayFrame;
            cannyImageBox.Image = cannyFrame; //转成图片并显示在主界面上
        }

        private void CaptureButtonClick(object sender, EventArgs e)
        {
            if (_capture != null)
            {
                if (_captureInProgress)
                {
                    //stop the capture
                    captureButton.Text = "Start Capture";
                    _capture.Pause();
                }
                else
                {
                    //start the capture
                    captureButton.Text = "Stop";
                    _capture.Start();
                }

                _captureInProgress = !_captureInProgress;
            }
        }

        private void ReleaseData()//释放资源
        {
            if (_capture != null)
                _capture.Dispose();
        }

        private void FlipHorizontalButtonClick(object sender, EventArgs e)
        {
            if (_capture != null) _capture.FlipHorizontal = !_capture.FlipHorizontal;
        }

        private void FlipVerticalButtonClick(object sender, EventArgs e)
        {
            if (_capture != null) _capture.FlipVertical = !_capture.FlipVertical;
        }
    }
}

        public CameraCapture()
        {
            InitializeComponent();
            try
            {
                //_capture = new Capture();
                var fileName = "文件地址";
                _capture = new Capture(fileName);
                _capture.ImageGrabbed += ProcessFrame;
            }
            catch (NullReferenceException excpt)
            {
                MessageBox.Show(excpt.Message);
            }
        }