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1. namespace CvMoveDetection { public partial class VideoViewer : Form { private bool _beep = false; private System.Media.SoundPlayer player; private SimpleProcessing sp; public VideoViewer() { InitializeComponent(); player = new System.Media.SoundPlayer(); player.SoundLocation = "notify.wav"; trackBar1.ValueChanged += new EventHandler(trackBar1_ValueChanged); USBWebCam.NewFrameEvent += USBWebCamOnNewFrameEvent; sp = new SimpleProcessing(); sp.Init(); sp.SimpleProcessedFrame += new SimpleProcessing.SimpleProcessedFrameHandler(sp_SimpleProcessedFrame); USBWebCam.AddFrameProcessing(sp); USBWebCam.Start(); } void trackBar1_ValueChanged(object sender, EventArgs e) { sp.Sense = trackBar1.Value; } void sp_SimpleProcessedFrame(object sender, FrameEvent e) { if (Utils.DetectMove(e.Frame) && !_beep) Play(); } private void Play() { if (!_beep) ThreadPool.QueueUserWorkItem(ignoredState => { _beep = true; player.PlaySync(); _beep = false; }); } private void USBWebCamOnNewFrameEvent(FrameEvent e) { pictureBox1.Image = (Bitmap)e.Frame.Clone(); } private void checkBox1_CheckedChanged(object sender, EventArgs e) { sp.Debug = checkBox1.Checked; } } public class USBWebCam {

5public delegate void FrameEventHandler(FrameEvent e); public static event FrameEventHandler NewFrameEvent; private const int FPS = 10; private static List _filters = new List(); private static CvCapture _camera; public static void Start() { _camera = CvCapture.FromCamera(0); //need to query frame every 1000/FPS ms Timer timer = new Timer(); timer.Interval = FPS; timer.Tick += delegate(object sender, EventArgs e) { using (IplImage frame = _camera.QueryFrame()) { PreProcessFrame(frame); ProcessFrame(frame); PostProcessFrame(frame); } }; timer.Start(); } public static void AddFrameProcessing(IFrameProcessing frameProcessing) { _filters.Add(frameProcessing); } private static void PreProcessFrame(IplImage frame) { if (NewFrameEvent != null) NewFrameEvent(new FrameEvent(frame.ToBitmap())); } private static void ProcessFrame(IplImage frame) { foreach (IFrameProcessing filter in _filters) { IplImage filtered = filter.ProcessFrame(frame); filter.RaiseFrameProcessingEvent(filtered); } } private static void PostProcessFrame(IplImage frame) { } } public interface IFrameProcessing { IplImage ProcessFrame(IplImage frame); void RaiseFrameProcessingEvent(IplImage processedFrame); }

public class SimpleProcessing : IFrameProcessing { public delegate void SimpleProcessedFrameHandler(object sender, FrameEvent e); public event SimpleProcessedFrameHandler SimpleProcessedFrame;

6private int _minT = 0; private int _maxT = 255; private bool _debug = false; public int Sense { get { return _minT; } set { _minT = value; } } public bool Debug { get { return _debug; } set { _debug = value; } } IplImage _prevFrame = null; public void Init() { } public OpenCvSharp.IplImage ProcessFrame(OpenCvSharp.IplImage frame) { if (_prevFrame == null) { _prevFrame = Cv.CreateImage(frame.GetSize(), frame.Depth, frame.NChannels); Cv.Copy(frame, _prevFrame); } //split current and previous frame in channels IplImage[] channels = frame.Split(); IplImage[] prevChannels = _prevFrame.Split(); //create sub results array IplImage[] sub = _prevFrame.Split(); for (int i = 0; i < frame.NChannels; i++) { //make image zero value sub[i].SetZero(); //make sub Cv.Sub(channels[i], prevChannels[i], sub[i]); } //create one channel simple image for save binary mask IplImage mask = Cv.CreateImage(frame.GetSize(), BitDepth.U8, 1); //initialization of mask if (frame.NChannels > 1) Cv.And(sub[0], sub[1], mask);

7else Cv.Copy(sub[0], mask); //mask store pixels what appears on every channels for (int i = 2; i < frame.NChannels; i++) Cv.And(sub[i], mask, mask); //simple make positive values for each pixel more than _minT and less than _maxT mask.Threshold(mask, _minT, _maxT, ThresholdType.Binary); if (_debug) Cv.ShowImage("Detection", mask); //save current frame for future Cv.Copy(frame, _prevFrame); return mask; } public void RaiseFrameProcessingEvent(OpenCvSharp.IplImage processedFrame) { SimpleProcessedFrameHandler handler = SimpleProcessedFrame; if (handler != null) handler(this, new FrameEvent(processedFrame.ToBitmap())); } } }