Ryan,
Do you first have an idea on how to hook up a ping pong ball gun to your BoeBot? That's quite a small platform to support something so big ... will be a great build!
Once you get it running (with a webcam attached too ... ) you can start by seeing what the camera would see if a ping pong ball is placed in front of it. Given that the camera will most likely be an NTSC camera you will probably have some issues in getting a solid image. But you can try the canny module followed by the circle module in order to detect where a circle might be.
STeven.
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