(19)

(11)

EP 0 449 827 A1

(12)

(43) Date of publication: 09.10.1991 Bulletin 1991/41 (21) Application number: 89906420.0 (22) Date of filing: 15.05.1989

(51) International Patent Classification (IPC):  G06T 7/ 20( . ) G08G 1/ 04( . ) G08B 13/ 194( . ) H04N 7/ 26( . ) (86) International application number: PCT/GB1989/000523 (87) International publication number: WO 1990/014634 (29.11.1990 Gazette 1990/27)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (71) Applicant: ROKE MANOR RESEARCH LIMITED Romsey, Hampshire, SO51 0ZN (GB)	(72) Inventor: HARRIS, Christopher, George Nr. Romsey Hants (GB) (74) Representative: Fish, Norman Ernest  Siemens Group Services Limited, Intellectual Property Department, Roke Manor, Old Salisbury Lane Romsey, Hampshire SO51 0ZN Romsey, Hampshire SO51 0ZN (GB)