(19)

(11)

EP 1 000 506 A1

(12)

(43) Date of publication: 17.05.2000 Bulletin 2000/20 (21) Application number: 98938145.4 (22) Date of filing: 30.07.1998

(51) International Patent Classification (IPC)7: H04N 5/217 (86) International application number: PCT/US9815/848 (87) International publication number: WO 9907/138 (11.02.1999 Gazette 1999/06)

(84) Designated Contracting States: DE FR GB (30) Priority: 31.07.1997 US 904159 (71) Applicant: PPT Vision, Inc. Eden Prairie, MN 55344-3446 (US)	(72) Inventors: TONKIN, Steven, W. Eden Prairie, MN 55346 (US) LIEBERT, Scott, S. St. Louis Park, MN 55426 (US) (74) Representative: Beresford, Keith Denis Lewis et al BERESFORD & Co.High Holborn2-5 Warwick Court London WC1R 5DJ London WC1R 5DJ (GB)