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Motion Tracking via webcam and C++

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Hey, I'm working on a game which involves motion tracking and for the PC port, I'd like to let the user use his/her webcam to guide objects, etc. So far, I haven't been able to find any algorithms to do this. I see videos and such all the time, but never any source code. I guess most people don't like their work stolen or anything like that.

Not sure if it matters, but my PC port is using OpenGL. Is there a webcam API that allows me to copy the pixels received from the webcam to a texture rectangle? Or should I use DirectShow? Thanks.

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OpenCV might be what you want.

http://opencv.willowgarage.com/wiki/

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Never heard of this OpenCV before. This is interesting. I think it should work just fine for my game's PC port. Hopefully there isn't too much restriction on using it commercially. Thanks.

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