   pattern recognition - correlation algorithms
  I am looking for a correlation algorithm for pattern recognition in image files.  I found some tutorials and sample code over at http://www.catenary.com/howto/findmark.html, but unfortunately you have to have the Victor Image Processing Software ($499) for all the functions.  Does anybody know of either some good tutorials on how to do this yourself OR a free image library that does this?  I've found some papers on the subject but they are all much too complicated.  Unforunately I'm not very familiar with this concept and I need to learn a lot about it in a short amount of time.  Any help is appreciated.   
Quote:Original post by StonieJI am looking for a correlation algorithm for pattern recognition in image files.  I found some tutorials and sample code over at http://www.catenary.com/howto/findmark.html, but unfortunately you have to have the Victor Image Processing Software ($499) for all the functions.  Does anybody know of either some good tutorials on how to do this yourself OR a free image library that does this?  I've found some papers on the subject but they are all much too complicated.  Unforunately I'm not very familiar with this concept and I need to learn a lot about it in a short amount of time.  Any help is appreciated.The basic idea is to calculate the correlation between the two images (typically a scene [larger] and an object to be located [smaller]) and high areas in the correlation image (about the size of the scene image) represent areas in the scene which "look like" the target object.  My memory of this technique is rusty, but I believe there are various ways of calculating the 2D correlation.I can't vouch for the following, but I hope at least one of them is useful:http://mathforum.org/epigone/sci.math.num-analysis/grerjermspi/35ED1B3B.7D0A5B59@ulst.ac.ukhttp://www.shef.ac.uk/mecheng/mechsol/exptmech/twa26/image.html-Predictorhttp://will.dwinnell.com;  I found a few more Web pages related to pattern recognition by correlation (at least in part), which might be of interest:http://www.public.iastate.edu/~knutzonj/ee424projectMain.htmhttp://www.idiom.com/~zilla/Papers/nvisionInterface/nip.htmlhttp://www.ece.cmu.edu/~marlene/kumar/Biometrics_AutoID.pdf-Predictorhttp://will.dwinnell.com;  Hey, thanks a lot for the info!  For some reason I'm no longer getting any emails notifying me when people reply to my posts, so I figured this thread was dead, but I just happened to stumble upon it and find a reply.   