This video is an example of using Processing in combination with zxing library to process a QR code read the information and put synthetic information over it.
If the code is text, put the text,
if it is a link to image, the image
Tools:
Processing - http://processing.org/
Zxing library - QR: http://code.google.com/p/zxing/
QR code generator http://qrcode.kaywa.com/
This example is based on http://answers.oreilly.com/topic/1337...
Original Video:
• Augmented Reality in Processing