(19)

(11)

EP 0 756 734 A1

(12)

(43) Date of publication: 05.02.1997 Bulletin 1997/06 (21) Application number: 95915923.0 (22) Date of filing: 19.04.1995

(51) International Patent Classification (IPC):  G06F 17/ 24( . ) G06T 11/ 60( . ) (86) International application number: PCT/GB1995/000880 (87) International publication number: WO 1995/029463 (02.11.1995 Gazette 1995/47)

(84) Designated Contracting States: BE CH DE ES FR GB IT LI NL SE (30) Priority: 21.04.1994 EP 19940302866 (71) Applicant: BRITISH TELECOMMUNICATIONS public limited company London EC1A 7AJ (GB)	(72) Inventors: UTTON, Peter, Covington Ipswich Suffolk IP9 2DB (GB) SANDERS, Paul, Maurice Ipswich Suffolk IP12 4NG (GB) (74) Representative: Dutton, Erica L. G.  BT Group Legal Services, Intellectual Property Department, 8th Floor, Holborn Centre 120 Holborn London EC1N 2TE London EC1N 2TE (GB)