A portable device having scanning, imaging or other data-capture capability is described. In some cases, the portable device can indicate to the user when enough information has been captured to uniquely identify a source document. In some cases, the portable device calculates timestamps and location-stamps...http://www.google.co.uk/patents/US20060029296?utm_source=gb-gplus-sharePatent US20060029296 - Data capture from rendered documents using handheld device
