(via YouTube)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/