Looking for free/opensource code or description of algorithms to code (simple) and decode (hard) the 2D barcode QR code.
It doesn't seem like a trivial problem, but it's so popular in Japan that there must be something already available...
9 Answers
I have a colleague who worked on ZXing ("Zebra Crossing").
That's got a fair variety of platform support.
(In response to those asking about QR codes in PHP)
The Google Charts QR chart type might work for you, if you don't expect a lot of traffic, or if you can cache the images. It's extremely easy to use- just put the text to encode in the URL.
Here's a good LGPL library for encoding QR code libqrencode
Libqrencode is a C library for encoding data in a QR Code symbol, a kind of 2D symbology that can be scanned by handy terminals such as a mobile phone with CCD. The capacity of QR Code is up to 7000 digits or 4000 characters, and is highly robust.
Here's a Google code project that decodes QR code - aimed at iPhone, but is LGPL and the source is available. Should be adaptable...
-Adam
PyQrCodec is a Python library for encoding Qr codes to a PNG and decoding them from a variety of image formats.
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