iPhone - Detect (recognize) a visual pattern or object using the device's camera [duplicate]

This question already has answers here: iPhone and OpenCV (13 answers) Closed 2 years ago.

I would like to develop a simple application to detect (recognize) a certain pattern (lets say the logo of a car manufacturer) using the iPhone's camera.

I don't know from were to start. Can you give me a hint? What framework are available for this type of image processing, are somewhere on the internet some tutorials related to this?

I just know about open开发者_如何学JAVACV, but I couldn't find a ported iPhone version.

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I believe there is a port of openCV for the iPhone in openFrameworks