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C# motion detection source code: How to achieve tripwire with a USB webcam

/ Published in: C#
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Tripwire is a special part of motion detection that can be used to monitor and alert on specific changes. More specifically: tripwire means the detection of intrusion.

This code snippet presents how to create a C# software by using prewritten computer vision components (www.camera-sdk.com) allowing you to get notified when your USB webcam triggers an intrusion. For instance, by using this application, you can use your camera to alarm when a people enters into the shop/office, or even to count how many people entered, etc.

After the necessary using lines and objects you need to implement the Main method and the necessary functions for connecting to a USB webcamera. The startBt_Click method is used to start the tripwire functionality. Thereafter you can see how to handle the enter and exit events.

Nothing could be more simple! :)

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  1. using System;
  2. using System.Drawing;
  3. using System.Windows.Forms;
  4. using Ozeki.Media.MediaHandlers;
  5. using Ozeki.Media.MediaHandlers.Video;
  6.  
  7. namespace Tripwire_WF
  8. {
  9.     public partial class MainForm : Form
  10.     {
  11.         private WebCamera _camera;
  12.         private DrawingImageProvider _provider;
  13.         private MediaConnector _connector;
  14.  
  15.         private Tripwire tripwire;
  16.  
  17.         private Point _p1, _p2;
  18.  
  19.         public MainForm()
  20.         {
  21.             InitializeComponent();
  22.  
  23.             tripwire = new Tripwire();
  24.  
  25.             _provider = new DrawingImageProvider();
  26.             _connector = new MediaConnector();
  27.         }
  28.  
  29.         private void connectBt_Click(object sender, EventArgs e)
  30.         {
  31.             _camera = WebCamera.GetDefaultDevice();
  32.             if (_camera == null) return;
  33.  
  34.             videoViewerWF1.SetImageProvider(_provider);
  35.  
  36.             _connector.Connect(_camera, tripwire);
  37.             _connector.Connect(tripwire, _provider);
  38.  
  39.             _camera.Start();
  40.  
  41.             videoViewerWF1.Start();
  42.         }
  43.  
  44.         private void startBt_Click(object sender, EventArgs e)
  45.         {
  46.             tripwire.Line.LineWidth = 3;
  47.             tripwire.LineColor = Color.Red;
  48.  
  49.             tripwire.SetPoints(new Point(300, 100), new Point(150, 300));
  50.             tripwire.HighlightMotion = HighlightMotion.Highlight;
  51.  
  52.             tripwire.MotionColor = Color.Blue;
  53.             tripwire.TripwireMotionEnteredToLine += TripwireTripwireMotionEnteredToLine;
  54.             tripwire.TripwireMotionLeaveFromLine += TripwireTripwireMotionLeaveFromLine;
  55.  
  56.             tripwire.Start();
  57.         }
  58.  
  59.         private void stopBt_Click(object sender, EventArgs e)
  60.         {
  61.             tripwire.Stop();
  62.         }
  63.  
  64.         void InvokeThread(Action action)
  65.         {
  66.             Invoke(action);
  67.         }
  68.  
  69.         void TripwireTripwireMotionLeaveFromLine(object sender, TripwireMotionCrossedArgs e)
  70.         {
  71.             InvokeThread(() => { crossedText.Text = @"EXIT!!!"; });
  72.         }
  73.  
  74.         void TripwireTripwireMotionEnteredToLine(object sender, TripwireMotionCrossedArgs e)
  75.         {
  76.             InvokeThread(() => { crossedText.Text = @"ENTER!!!"; });
  77.         }
  78.  
  79.         private void videoViewerWF1_MouseDown(object sender, MouseEventArgs e)
  80.         {
  81.             if (e.Button != MouseButtons.Left) return;
  82.             _p1 = e.Location;
  83.             videoViewerWF1.MouseMove += videoViewerWF1_MouseMove;
  84.         }
  85.  
  86.         private void videoViewerWF1_MouseUp(object sender, MouseEventArgs e)
  87.         {
  88.             if (e.Button != MouseButtons.Left) return;
  89.             _p2 = e.Location;
  90.             tripwire.SetPoints(_p1, _p2);
  91.             videoViewerWF1.MouseMove -= videoViewerWF1_MouseMove;
  92.         }
  93.  
  94.         private void videoViewerWF1_MouseMove(object sender, MouseEventArgs e)
  95.         {
  96.             _p2 = e.Location;
  97.             tripwire.SetPoints(_p1, _p2);
  98.         }
  99.     }
  100. }

URL: http://www.camera-sdk.com

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