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PORecording from a Webcam based on motion. wpf using aforge
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  1. PORecording from a Webcam based on motion. wpf using aforge
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    copied!<p>I have made a simple program that displays video from a webcam and can detect motion from the feed, but I am having a problem understanding how I go about recording from the webcam when motion is detected. I have searched on the Aforge.Net site but I am finding it hard to understand what I need to do. When motion is detected, I want to start recording to a pre determined destination and when no motion is detected, I want to continue recording for a set period of time and then stop. This is part of my program that I have so far...</p> <p>Please can you help to explain it to me and let me know if I need to supply more info or code. Thanks</p> <p>$// Open video source</p> <pre><code> private void OpenVideoSource(IVideoSource source) { // set busy cursor //this.Cursor = Cursors.WaitCursor; // close previous video source CloseVideoSource(); //motionDetectionType = 1; //SetMotionDetectionAlgorithm(new TwoFramesDifferenceDetector()); //motionProcessingType = 1; //SetMotionProcessingAlgorithm(new MotionAreaHighlighting()); // start new video source videoSourcePlayer.VideoSource = new AsyncVideoSource(source); videoSourcePlayer.NewFrame +=new VideoSourcePlayer.NewFrameHandler(videoSourcePlayer_NewFrame); //videoSourcePlayer.DesiredFrameRate = 30; //webcam's default frame rate will be used instead of above code that has an error // create new video file writer.Open("test.avi", width, height, 25, VideoCodec.MPEG4); // create a bitmap to save into the video file Bitmap image = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format24bppRgb); // write 1000 video frames for (int i = 0; i &lt; 1000; i++) { image.SetPixel(i % width, i % height, System.Drawing.Color.Red); writer.WriteVideoFrame(image); } writer.Close(); try { videoSourcePlayer.Start(); //motionAlarmLevel = sldMotionSensitivity.Value / 100; } catch (Exception x) { System.Windows.MessageBox.Show(x.ToString()); } //videoSource.DesiredFrameSize = new System.Drawing.Size(800,600); videoSourcePlayer.BorderColor = System.Drawing.Color.Blue; // reset statistics statIndex = statReady = 0; // start timers clock.Start(); //alarm.Start(); videoSource = source; //this.Cursor = Cursors.Default; } // Close current video source private void CloseVideoSource() { // set busy cursor //this.Cursor = Cursors.WaitCursor; // stop current video source videoSourcePlayer.SignalToStop(); // wait 2 seconds until camera stops for (int i = 0; (i &lt; 50) &amp;&amp; (videoSourcePlayer.IsRunning); i++) { Thread.Sleep(100); } if (videoSourcePlayer.IsRunning) videoSourcePlayer.Stop(); // stop timers clock.Stop(); //alarm.Stop(); motionHistory.Clear(); // reset motion detector if (detector != null) detector.Reset(); //videoSourcePlayer.BorderColor = System.Drawing.Color.Red; //this.Cursor = Cursors.Default; } // New frame received by the player void videoSourcePlayer_NewFrame(object sender, ref Bitmap image) { lock (this) { if (detector != null) { //motion detected if (detector.ProcessFrame(image) &gt; motionAlarmLevel) { //float motionLevel = detector.ProcessFrame(image); videoSourcePlayer.BorderColor = System.Drawing.Color.Red; Dispatcher.BeginInvoke(new ThreadStart(delegate { lblMotionDetected.Content = "Motion Detected"; })); //lblMotionDetected.Content = "Motion Detected"; //flash = (int)(2 * (1000 / alarm.Interval)); } // no motion detected if (detector.ProcessFrame(image) &lt; motionAlarmLevel) { videoSourcePlayer.BorderColor = System.Drawing.Color.Black; Dispatcher.BeginInvoke(new ThreadStart(delegate { lblMotionDetected.Content = "No Motion Detected"; })); } // if (motionLevel &gt; motionAlarmLevel) // { // // flash for 2 seconds // timer.Start(); // } } } } </code></pre>
 

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