(19)
(11) EP 1 211 520 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION

(48) Corrigendum issued on:
09.07.2003 Bulletin 2003/28

(88) Date of publication A3:
04.06.2003 Bulletin 2003/23

(43) Date of publication:
05.06.2002 Bulletin 2002/23

(21) Application number: 02004163.8

(22) Date of filing: 29.05.1998
(51) International Patent Classification (IPC)7: G01S 5/16, G01S 17/87, H04N 5/272
(84) Designated Contracting States:
BE DE FR GB IT

(30) Priority: 30.05.1997 GB 9711316
02.06.1997 GB 9711373

(62) Application number of the earlier application in accordance with Art. 76 EPC:
98924477.7 / 1015909

(71) Applicant: BRITISH BROADCASTING CORPORATION
London W1A 1AA (GB)

(72) Inventors:
  • Russell, Richard Thomas
    Orsett, Essex RM16 3DF (GB)
  • Thomas, Graham Alexander
    Uckfield, East Sussex TN22 3HA (GB)

(74) Representative: Kazi, Ilya et al
Mathys & Squire, 100 Gray's Inn Road
London WC1X 8AL
London WC1X 8AL (GB)

 
Remarks:
This application was filed on 26 - 02 - 2002 as a divisional application to the application mentioned under INID code 62.
 


(54) Position determination


(57) A method of determining the position of an object based on the identification of a plurality of markers at respective reference positions, wherein correction factors are applied to the stored or measured marker positions to prevent a jump in the determined position of the object as markers pass into and out of use. The correction factors are calculated so that the corrected marker positions tend to mutually self-consistent values and the rate of variation of the correction factors is limited to a pre-determined level.