With the ever changing technology market, mobile devices are the latest in powerful, compact and capable line of consumer electronics. Many existing applications are finding new uses on these devices. While there are many different areas currently benefiting from the mobility and computational power offered by today's mobile devices, the field of Computer Vision in particular, is seeing resurgence in new innovation targeted for these devices.

This paper details the process of the design, development and implementation of a QR Barcode reader. The main objective of this paper is to serve as a guide for developing or porting new and existing computer vision application to the iPhone and Windows Mobile development platforms. As part of this paper, OpenCV, a leading open source computer vision framework has been ported to work on both the iPhone and Windows Mobile powered mobile devices.