QR Code encode and decode

Functions to encode and decode a QR bar-code in images

A wrapper to the zxing library (http://code.google.com/p/zxing/). This submission includes files to encode a QR code from a string message, and decode a string message from an image containing an existing QR code. With little work these functions can be expanded to search for multiple bar-codes in images, decode multiple bar-codes in a single image etc.