(19)

(11)

EP 0 797 813 A1

(12)

(43) Date of publication: 01.10.1997 Bulletin 1997/40 (21) Application number: 95941169.0 (22) Date of filing: 15.12.1995

(51) International Patent Classification (IPC):  G06T 7/ 20( . ) (86) International application number: PCT/GB1995/002942 (87) International publication number: WO 1996/018976 (20.06.1996 Gazette 1996/28)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IE IT LI NL PT SE (30) Priority: 15.12.1994 GB 19940025328 (71) Applicant: Snell & Wilcox Limited Petersfield, Hampshire GU31 5AZ (GB)	(72) Inventor: MAJOR, Andrew Petersfield Hampshire GU32 3QY (GB) (74) Representative: Garratt, Peter Douglas, et al  Mathys & Squire 100 Grays Inn Road London WC1X 8AL London WC1X 8AL (GB)