computer vision - An iPhone library for shape recognition via the camera -

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i hope falls within "programming question" category. im lightheaded googling (and reading every post in here on subject) on subject "computer vision", im getting more confused enlightened.

i have 6 abstract shapes printed on piece of paper , have camera on iphone identify these shapes (from different angles, lightning etc.).

i have used opencv while back(java) , looked @ other libraries out there. caveat seems either rely on jail broken iphone or experimental , hard use end using days learning libraries figure out didn't work.

i have thought of taking +1000 images of shapes , training haar filter. again if there out there bit easier work appreciate advise, suggestion of people bit of experience.

thank suggestion or pieces of advise might have:)

have @ at opencv's surf feature extraction (they have demo uses detect objects). surf features salient image features invariant rotation , scale. many algorithms detect objects extracting such features image, , use simple "bag of words" classification (comparing set of extracted image features features of "shapes". without referring spacial alignment can have detection rates if have 6 shapes).


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