Well-known algorithms for detecting 'highly descriptive features' in images that can cope with scaling and rotation (up to a certain degree of course) are SIFT and SURF (SURF is generally considered the more mature of the two afaik)
http://en.wikipedia.org/wiki/Scale-invariant_feature_transform http://en.wikipedia.org/wiki/SURF <http://en.wikipedia.org/wiki/SURF>that link comes with links to the original papers as well as a list of open-source implementations, e.g: http://code.google.com/p/javasurf/ <http://code.google.com/p/javasurf/>I don't have experience with the open-source code myself, and you probably have to make a similiary-like method based on the more low-level methods that implement these algorithms. So this is perhaps a more 'down in the trenches' -approach, but at least it should give you some solid background on how this is done. Geert-Jan 2010/12/11 Dennis Gearon <gear...@sbcglobal.net> > Tried one, of Perry Mason's secretary when she was young (and HOOOOOOOT), > Barbara Hale. > http://www.skylighters.org/ggparade/index8.html > > Didn't find it. 1.8 billion images indexed is probably a DROP in the bucket > of > what's out there. > > Dennis Gearon > > > Signature Warning > ---------------- > It is always a good idea to learn from your own mistakes. It is usually a > better > idea to learn from others’ mistakes, so you do not have to make them > yourself. > from 'http://blogs.techrepublic.com.com/security/?p=4501&tag=nl.e036' > > > EARTH has a Right To Life, > otherwise we all die. > > > > ----- Original Message ---- > From: Dennis Gearon <gear...@sbcglobal.net> > To: solr-user@lucene.apache.org > Sent: Fri, December 10, 2010 9:24:53 PM > Subject: Re: Search based on images > > Threre is actually some image recognition search engine software somewhere > I > heard about. Take a picture of something, say a poster, upload it, and it > will > adjust for some lighting/angle/distortion, and try to find it on the web > somewhere. > > You hear about crazy stuff like this at dev camps. Basically, handme downs > from > Homeland Security and the military ;-) > Dennis Gearon > > > Signature Warning > ---------------- > It is always a good idea to learn from your own mistakes. It is usually a > better > > idea to learn from others’ mistakes, so you do not have to make them > yourself. > from 'http://blogs.techrepublic.com.com/security/?p=4501&tag=nl.e036' > > > EARTH has a Right To Life, > otherwise we all die. >
