(19)

(11)

EP 0 289 500 A1

(12)

(43) Date of publication: 09.11.1988 Bulletin 1988/45 (21) Application number: 87900206.0 (22) Date of filing: 16.12.1986

(51) International Patent Classification (IPC):  G06T 1/ 00( . ) G06T 7/ 60( . ) G06T 7/ 00( . ) (86) International application number: PCT/GB1986/000765 (87) International publication number: WO 1987/003719 (18.06.1987 Gazette 1987/13)

(84) Designated Contracting States: CH DE FR LI NL (30) Priority: 16.12.1985 GB 19850030929 16.12.1985 GB 19850030928 (71) Applicant: NATIONAL RESEARCH DEVELOPMENT CORPORATION London SE1 6BU (GB)	(72) Inventors: DAVIES, Emlyn, Roy Englefield Green Surrey TW20 0QU (GB) JOHNSTONE, Adrian, Ivor, Clive Englefield Green Surrey TW20 ORR (GB) (74) Representative: Cullis, Roger  Patents Department British Technology Group Ltd 101 Newington Causeway London SE1 6BU London SE1 6BU (GB)