Photography – Exposure control circuit – Color temperature compensation or detection
Patent
1996-07-11
2000-02-01
Metjahic, Safet
Photography
Exposure control circuit
Color temperature compensation or detection
369281, G03B 700, G03B 702, G03B 1718
Patent
active
060212799
ABSTRACT:
A colorimetric device, particularly suitable for a camera, that provides reliable color data so that a subject field is photographed with appropriate color balance. A CPU reads out sensor data D.sub.B, D.sub.R corresponding to red (R) and blue (B) light components of an incident light from the subject field a light sensor or photometric element disposed in the camera. Next, the CPU compares the sensor data D.sub.B of the B color component, and the sensor data D.sub.R of the R color component, with a predetermined standard value K1, and when it is determined that either of the sensor data D.sub.B of the B color component, or the sensor data D.sub.R of the R color component, is below the standard value K1, a "measurement impossible" display is performed for a color temperature T and a balance value LB. On the other hand, if both sensor data D.sub.B, D.sub.R are greater than the standard value K1, the color temperature T and the light balance value LB are calculated by a calculation circuit. The color temperature T and the light balance value LB are displayed.
REFERENCES:
patent: Re34926 (1995-05-01), Hieda et al.
patent: 4272176 (1981-06-01), Maitani et al.
patent: 4335943 (1982-06-01), Numata
patent: 4335959 (1982-06-01), Manning
patent: 4389118 (1983-06-01), Yuasa et al.
patent: 5030981 (1991-07-01), Matsuzuki et al.
patent: 5031049 (1991-07-01), Toyama et al.
patent: 5053871 (1991-10-01), Ogawa et al.
patent: 5351080 (1994-09-01), Kyuma et al.
patent: 5371655 (1994-12-01), Murdock et al.
patent: 5389969 (1995-02-01), Suzuki et al.
patent: 5469239 (1995-11-01), Ishida et al.
patent: 5504524 (1996-04-01), Lu et al.
patent: 5521589 (1996-05-01), Mandrosch et al.
Electronics Now, vol. 65, No. 5., "Low Cost Colorimeter", pp. 45-48, J. Schnable, G. Alessandro and R. Orr, May 1994.
Mahoney Christopher E.
Metjahic Safet
Nikon Corporation
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