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images as marker (Read 924 times)
timm
images as marker
Feb 4th, 2010, 2:04am  
Hi everybody,

i'd like to do a software, that recognizes images as markers. e.g. i'd create a defined pool of images and the software would analyze the image of the webcam too see if one of those images do appear in the camera.

does anybody know how to do that? or does anybody know a library that does sth like this?

Thanks
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timm
Re: images as marker
Reply #1 - Feb 4th, 2010, 2:46am  
i found some interesting links regarding this problem:

http://code.google.com/p/aam-opencv/
http://nashruddin.com/template-matching-in-opencv-with-example.html

seems like opencv somehow could be used to do sth like this...
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naus3a
Re: images as marker
Reply #2 - Feb 7th, 2010, 6:21am  
template matching in opencv works fine under particular conditions: it main weakness is that it's not scale or rotation invariant, which roughly means that it's very good to recognize ie. icons on your desktop, but will not recognize its target when it's deformed by perspective (ie. most cases of real world augmented reality scenarios).

if you can use "formatted images" as markers you'll find plenty of out of the box solutions: ie. artoolkit will do the trick pretty easily demanding only that you use a simple image with a square bold boreder.

if you don't want limitations on your marker image, you should look into the SURF algorithm.
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