Tuesday, June 5, 2012

Canny and Sobel Edge Detection in C#

Sobel and Canny are major edge detection algorithms in Image Processing. Here I have implemented those algorithms using c#.

Download the source code from here.

Canny Edge Detection (click to zoom)

Sobel Edge Detection (click to zoom)




You can improve the program by using optimization methods such as threading and loop optimization.

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24 comments:

  1. AnonymousJune 21, 2012 at 6:39 AM

    Would you be willing to repost a download link to the source? The existing link isn't working.

    ReplyDelete
  2. AnonymousJuly 3, 2012 at 2:34 PM

    plz send me this code.ur link is not valid

    ReplyDelete
  3. serpilNovember 2, 2012 at 3:42 AM

    please send me url download of this code

    ReplyDelete
    Replies
    1. Chathuranga PathiranaNovember 12, 2012 at 12:57 AM

      check the link now,

      Delete
    2. UnknownDecember 2, 2015 at 4:00 PM

      please i dont have account could you please send me the code of canny edge detection

      Delete
  4. UnknownDecember 3, 2012 at 4:53 PM

    hi. i need to canny code for c# . please send me this code.thanks

    ReplyDelete
    Replies
    1. Chathuranga PathiranaDecember 5, 2012 at 6:23 PM

      check the download link, you may need to log to shared hosting site.

      Delete
  5. UnknownJanuary 1, 2013 at 11:11 PM

    heyy man..Sobel Edge Detection source code plz...

    ReplyDelete
    Replies
    1. Chathuranga PathiranaJanuary 4, 2013 at 2:35 AM

      you can find it in the attached project.

      -imp4.cs and method is private void sobel ( )

      Delete
  6. AnonymousMarch 6, 2013 at 7:50 PM

    for ( int wi = -1; wi < 2; wi++ )
    {
    for ( int hw = -1; hw < 2; hw++ )
    {

    why the start value is -1
    why not start by 0

    ReplyDelete
    Replies
    1. Chathuranga PathiranaMarch 7, 2013 at 12:55 AM

      Because of previous loops. Numbers depends on how you use them.

      This is a pure implementation of algorithm. Please use this in a optimized manner.

      Delete
  7. AnonymousMarch 6, 2013 at 7:56 PM

    for ( int wi = -1; wi < 2; wi++ )
    {
    for ( int hw = -1; hw < 2; hw++ )
    {
    rc = allPixR[ i + hw,j + wi];
    new_rx += gx[ wi + 1,hw + 1] * rc;
    new_ry += gy[ wi + 1,hw + 1] * rc;

    gc = allPixG[ i + hw,j + wi];
    new_gx += gx[ wi + 1,hw + 1] * gc;
    new_gy += gy[ wi + 1,hw + 1] * gc;

    bc = allPixB[ i + hw,j + wi];
    new_bx += gx[ wi + 1,hw + 1] * bc;
    new_by += gy[ wi + 1,hw + 1] * bc;
    }
    }
    if ( new_rx * new_rx + new_ry * new_ry > limit || new_gx * new_gx + new_gy * new_gy > limit || new_bx * new_bx + new_by * new_by > limit )
    bb.SetPixel (i, j, Color.Black);
    //bb.SetPixel (i, j, Color.FromArgb(allPixR[i,j],allPixG[i,j],allPixB[i,j]));
    else
    bb.SetPixel (i, j, Color.White);
    }
    }

    for ( int wi = -1; wi < 2; wi++ ) nah tlng bnget knpa mulainya dari -1 kenap ndak mulai dari 0..


    artinya apa ini
    for ( int hw = -1; hw < 2; hw++ )
    {
    rc = allPixR[ i + hw,j + wi];
    new_rx += gx[ wi + 1,hw + 1] * rc;
    new_ry += gy[ wi + 1,hw + 1] * rc;
    saya belum paham ,kenapa gx[ wi + 1,hw + 1] * rc;??

    ReplyDelete
    Replies
    1. Chathuranga PathiranaMarch 7, 2013 at 12:56 AM

      I can not understand your language. :)

      Delete
    2. AnonymousMarch 8, 2013 at 4:48 PM



      briefly describe the flow of the program??

      what the mean for this loop??

      for ( int hw = -1; hw < 2; hw++ )
      {
      rc = allPixR[ i + hw,j + wi];
      new_rx += gx[ wi + 1,hw + 1] * rc;
      new_ry += gy[ wi + 1,hw + 1] * rc;

      Delete
    3. Chathuranga PathiranaMarch 11, 2013 at 2:08 AM

      Find the edge strength by taking the gradient of the image using Sobel operator

      Please refer this article
      http://en.wikipedia.org/wiki/Canny_edge_detector

      Delete
    4. AnonymousMarch 13, 2013 at 11:48 AM

      how about rc = allPixR[ i + hw,j + wi], what the mean??
      i + hw,j + wi parameters for what? value is taken from where??

      sorry many questions!!
      :)

      Delete
  8. UnknownJuly 24, 2013 at 2:37 PM

    Thanks for sharing..

    ReplyDelete
  9. Ş.Müslüm İncedalApril 5, 2014 at 6:14 AM

    Teşekürler.Thank you.

    ReplyDelete
  10. UnknownOctober 22, 2015 at 6:37 PM

    sorry,, I wanna ask you about this code, may i ask you by email?

    ReplyDelete
  11. UnknownJune 2, 2016 at 1:44 PM

    thank you so much :))

    ReplyDelete
  12. UnknownAugust 26, 2016 at 3:23 AM

    very helpfull code

    ReplyDelete
  13. UnknownOctober 31, 2017 at 2:41 PM

    Thank you very much for sharing the source :-)

    ReplyDelete
  14. UnknownMay 28, 2018 at 1:16 PM

    plz send me this code.ur link is not valid

    ReplyDelete

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