US5389969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus using brightness information from a photometering circuit and a brightness-converted green component from a color metering circuit to ultimately adjust white balance
Assignee: Nikon Corp
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Filing: 1993-12-21
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Granted: 1995-02-14
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Expires: 2013-12-21
Abstract
Abstract A white balance adjuster of a camera comprises a photometering unit for metering a brightness of an object based on a light directed to an image pickup unit of the camera, a color metering unit for metering a color temperature of a periphery of the camera, a plurality of white balance control tables and a selector for selecting one of the white balance control tables in accordance with object brightness information produced by the photometering unit and brightness converted information of the periphery of the camera produced by the color metering unit. A color balance of an output signal of the image pickup unit is adjusted in accordance with the selected white balance control table.
Inventors
- 👤 Masahiro Suzuki
- 👤 Masahiro Juen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:00
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/80; H04N23/84; H04N23/88
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A method of adjusting a white balance in a camera, wherein a brightness of an object is metered on the basis of light, the light being directed to an image pickup device of the camera to produce object brightness information, and a color temperature of light at a periphery of the camera is metered to produce brightness converted information which is a green component of light, and a white balance is controlled so as to adjust a color balance of an output signal from said image pickup device on the basis of the object brightness information and the brightness converted information.
Claim 2
Independent Claim
101 words
A method of adjusting a white balance in a camera, wherein a brightness of an object is metered on the basis of light, the light being directed to an image pickup device of the camera to produce object brightness information, and a color temperature of light at a periphery of the camera is metered to produce brightness converted information which is a green component of light, and a white balance is controlled so as to adjust a color balance of an output signal from said image pickup device on the basis of the object brightness information and the brightness converted information.
Claim 3
Independent Claim
97 words
A method of adjusting a white balance in a camera, wherein a brightness of an object is metered on the basis of light, the light being directed to an image pickup device of the camera to produce object brightness information, and a color temperature of light at a periphery of the camera is metered to produce brightness converted information, and a white balance is controlled so as to adjust a color balance of an output signal from said image pickup device on the basis of a difference between the object brightness information and the brightness converted information.
Claim 4
Independent Claim
97 words
A method of adjusting a white balance in a camera, wherein a brightness of an object is metered on the basis of light, the light being directed to an image pickup device of the camera to produce object brightness information, and a color temperature of light at a periphery of the camera is metered to produce brightness converted information, and a white balance is controlled so as to adjust a color balance of an output signal from said image pickup device on the basis of a difference between the object brightness information and the brightness converted information.
Claim 5
Dependent Claim
33 words
A method of adjusting a white balance in a camera according to claim 2, wherein the white balance is controlled on the basis of the object brightness information in addition to the difference.
Claim 6
Dependent Claim
36 words
A method of adjusting a white balance in a camera according to claim 2, wherein a white balance control table is selected from white balance control tables included in the camera for adjusting the white balance.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-02-13 | 1998-08-15 | 1999-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-13 | 2002-08-15 | 2003-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-13 | 2006-08-15 | 2007-02-14 | $7700.00 | Window Closed / Lapsed |