I was wondering if there is a script or function in javascript which can recognize image patterns. I want to use this for automation. It is comparable to http://sikuli.org/ but I want this to run as a Firefox extension. I think https://addons.mozilla.org/de/firefox/addon/imacros-for-firefox/ has this functionality but not in the free version.
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As the Wikipedia article on Computer Vision may suggest, this is a fairly large field within Computer Science.
While I haven't checked, I don't think there are any general-purpose scripts for the tasks you want to solve.
I suggest you read up on Computer Vision / Image recognition, and try to narrow down what functionality you're looking for, and ask more specific questions.

Morten Siebuhr
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Hmm. I think basically I need some sort of hashing function to recognize if a certain picture is found. Sikuli does this nicely with a percentage you can define. For example if you define 100 % the found picture has to be an exact match. If you define 70% similarity there can be slight changes and so on ... – user366121 May 09 '11 at 08:55