JavaScript QR Code Reader - can it be done? Or, Remote Service?

Question

I\'m doing a bit of preliminary research on an upcoming project and I have a quick question that I figure I\'ll throw up here while I look elsewhere, in case anyone has any

Answer 1

If you want a proof-of-concept, then here it is - a motion tracker written in pure Javascript.

However, support for it is not widespread right now. Only FF and the latest Webkit builds support it afaik.

Just noticed that you wanted this for a mobile device. Then absolutely go with a remote service. It will be really taxing even on the most high end devices assuming they even support it, which I highly doubt.