(19)

(11)

EP 0 755 548 A1

(12)

(43) Date of publication: 29.01.1997 Bulletin 1997/05 (21) Application number: 96902354.0 (22) Date of filing: 13.02.1996

(51) International Patent Classification (IPC):  G06T 7/ 20( . ) (86) International application number: PCT/GB1996/000314 (87) International publication number: WO 1996/025722 (22.08.1996 Gazette 1996/38)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IE IT LI NL PT SE (30) Priority: 13.02.1995 GB 19950002748 (71) Applicant: SNELL & WILCOX LIMITED Twickenham, Middlesex TW1 1RQ (GB)	(72) Inventors: THOMSON, Rod Chichester West Sussex PO18 9HU (GB) WESTON, Martin Hampshire GU39 4SS (GB) (74) Representative: Garratt, Peter Douglas, et al  Mathys & Squire 100 Grays Inn Road London WC1X 8AL London WC1X 8AL (GB)