How to detect canny edge and integral projection on a real time webcam using c# aforge? -

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"i have been trying detect canny edge on image , has been successful, don't know how detect edge if want real time, here code, has no error canny window can't processed

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.windows.forms; //using komcit; using system.drawing.imaging; using system.io; using system.timers; using aforge; using aforge.imaging.filters; using aforge.video.directshow; using system.threading;  namespace canny_video {     public partial class form1 : form     {         public form1()         {             initializecomponent();         }         private filterinfocollection capturedevice;         private videocapturedevice finalframe;          void finalframe_newframe(object sender, aforge.video.newframeeventargs eventargs)         {             camerabox.image = (bitmap)eventargs.frame.clone();         }          private static image resizeimage(image imgtoresize, size size)         {             return (image)(new bitmap(imgtoresize, size));         }          private void form1_load(object sender, eventargs e)         {             //timer1.enabled = true;             capturedevice = new filterinfocollection(filtercategory.videoinputdevice);             foreach (filterinfo device in capturedevice)             {                 listdevice.items.add(device.name);              }             listdevice.selectedindex = 0;             finalframe = new videocapturedevice();         }          private void start_click(object sender, eventargs e)         {             finalframe = new videocapturedevice(capturedevice[listdevice.selectedindex].monikerstring);             finalframe.newframe += new aforge.video.newframeeventhandler(finalframe_newframe);             finalframe.start();             //cannybox.image = (bitmap)camerabox.image.clone();    //capture image bitmap             //bitmap gambar = new bitmap(camerabox.image);             bitmap gambar = new bitmap(camerabox.image);             grayscale gray = new grayscale(0.2125, 0.7154, 0.0721);             cannyedgedetector cany = new cannyedgedetector(0, 70);             bitmap hasil = cany.apply(gray.apply(gambar));             // blobsfiltering blob = new blobsfiltering(0, 0, 20, 20);             //bitmap hasil = blob.apply(gray.apply(gambar));             //cannybox.width = gambar.width;             //cannybox.height = gambar.height;             cannybox.image = hasil;         }            private void form1_formclosing(object sender, formclosingeventargs e)         {             if (finalframe.isrunning == true)             {                 finalframe.stop();             }         }     } }

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my problem above solved, thank :) have problem on integral projection, didn't know how though. please help, thank in advance

some comments:

  • your 2 private variables confusingly named. capturedevice collection of capture devices on computer, while finalframe capture device.
  • you not canny edges on bitmap upon reception.
  • the newframe event handler runs in streaming thread, should use .begininvoke in there make usable ui thread.

what may do:

  • inside _newframe handler, use begininvoke transfer cloned image processcameraimage method (that hence run on ui thread).
  • apply canny edge detection within method.
  • then assign result picture box.

note: don't know how cpu heavy canny edge detection is. if it's costly, doing on ui thread may block user interaction. in case within streaming thread , transfer processed image display. depending on time takes, may force camera lower framerate.


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