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1. (WO1998053615) WHITE BALANCE CONTROL
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/053615 International Application No.: PCT/IB1998/000401
Publication Date: 26.11.1998 International Filing Date: 19.03.1998
IPC:
H04N 9/73 (2006.01)
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
N
PICTORIAL COMMUNICATION, e.g. TELEVISION
9
Details of colour television systems
64
Circuits for processing colour signals
73
colour balance circuits, e.g. white balance circuits, colour temperature control
Applicants:
KONINKLIJKE PHILIPS ELECTRONICS N.V. [NL/NL]; Groenewoudseweg 1 NL-5621 BA Eindhoven, NL
PHILIPS AB [SE/SE]; Kottbygatan 7 Kista S-164 85 Stockholm, SE (SE)
Inventors:
VAN DER VOORT, Victor, Henricus, Julianus; NL
Agent:
STEENBEEK, Leonardus, J.; Internationaal Octrooibureau B.V. P.O. Box 220 NL-5600 AE Eindhoven, NL
Priority Data:
97201534.122.05.1997EP
Title (EN) WHITE BALANCE CONTROL
(FR) COMMANDE D'EQUILIBRAGE DES BLANCS
Abstract:
(EN) In a white balance control in which correction signals are added to input chrominance signals (Uin, Vin) to obtain output chrominance signals (Uout, Vout), chrominance sum signals are furnished (A1) from chrominance signals (Uin, Vin; Uout, Vout) and reference chrominance signals (Uref, Vref), exponential signals are derived (E) from the chrominance sum signals, and the reference chrominance signals (Uref, Vref) are multiplied (M1) by the exponential signals to obtain the correction signals.
(FR) L'invention concerne une commande d'équilibrage des blancs dans laquelle on ajoute des signaux de correction à des signaux de chrominance d'entrée (Uin, Vin) pour obtenir des signaux de chrominance de sortie (Uout, Vout); on obtient (A1) des signaux de somme de chrominance à partir de signaux de chrominance (Uin, Vin; Uout, Vout) et de signaux de chrominance de référence (Uref, Vref), des signaux exponentiels sont dérivés (E) des signaux de somme de chrominance, et on multiplie (M1) les signaux de chrominance de référence (Uref, Vref) par les signaux exponentiels pour obtenir les signaux de correction.
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Designated States: JP
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0920782JP2000515350