http://sourceforge.net/projects/barcode2d/

Kevin Chu
kevin.gc@gmail.com

I wrote main, ReaderApplication, and the jpeg capture code by learning
from the source code of toolchain 0.30's HelloWorld, Squidge (the
video conferencing app we found a video of at the beginning of the
project) and getting people in iphone hacking chatrooms to help me
out.

For the recognizer, I copied and pasted the source code from version
0.8 of the qrcode library from http://qrcode.sourceforge.jp/ and
translated it into Objective-C. If you download version 0.8 of the
library (released Sep 1, 2007), and look through the source, you can
see the similarities. They're basically identical. (That's why the
project is open sourced under the GPL.)