Search a photo for drawing

Question

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

Please tell me why my question was thumbs downed? – Jab Dec 16 '09 at 00:41 — Jab, Dec 16 '09 at 00:41

score 0 · Answer 1 · edited May 23 '17 at 12:01

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You might want to look at OCR.

Here is one option: Mobile OCR Engine for iPhone app

edited May 23 '17 at 12:01

Community

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answered Dec 15 '09 at 13:47

Daniel A. White

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OCR - Optical Character Recognition. – Daniel A. White Dec 15 '09 at 13:54
OCR is a technology to detect text in an image and convert it to text. – Daniel A. White Dec 15 '09 at 14:21

score 0 · Accepted Answer · answered Dec 15 '09 at 17:11

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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.

answered Dec 15 '09 at 17:11

mousebird

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Is it free and can I sell my app with openCV in it? – Jab Dec 16 '09 at 12:46
The license is fairly friendly. I don't see why not. – mousebird Dec 18 '09 at 19:55

Search a photo for drawing

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