I want to be able to do something like take a picture of a chalkboard and search for what the teacher wrote and then delete the chalkboard and make like a CGContext Path of what the teacher wrote, or just have what the teacher wrote
A:
You might want to look at OCR.
Here is one option: http://stackoverflow.com/questions/1722269/mobile-ocr-engine-for-iphone-app
Daniel A. White
2009-12-15 13:47:43
OCR - Optical Character Recognition.
Daniel A. White
2009-12-15 13:54:51
What does OCR do, and does it work on the iPhone?
Jaba
2009-12-15 13:56:14
OCR is a technology to detect text in an image and convert it to text.
Daniel A. White
2009-12-15 14:21:33
Does it work on the iPhone?
Jaba
2009-12-16 12:45:34
A:
OCR is tricky with the iPhone camera. If you just want to pull out edges and save those you might try a Canny edge detector followed by a little edge linking to get larger features. You'll get some noise though, off a chalk board.
Easiest approach to that would be to use OpenCV. You can grab a version that's already been ported and compiled from this guy's site: http://niw.at/articles/2009/03/14/using-opencv-on-iphone/en
My sense is that this approach is probably not quite right for what you want. I'd sit down and think a bit more about what you're trying to do.
mousebird
2009-12-15 17:11:37