US5001552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
White balance correction using prestored flash lamp color temperature data
Assignee: Canon Inc
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Filing: 1989-03-27
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Granted: 1991-03-19
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Expires: 2009-03-27
Abstract
Abstract Color temperature data of a flash lamp is stored in a memory device. Ambient light color temperature data, without the flash, is detected. White balance is adjusted based on the stored data and the detected data.
Inventors
- 👤 Tadashi Okino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:43
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/70; H04N23/74; H04N23/80; H04N23/84; H04N23/88
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
74 words
An image pickup apparatus, comprising: (a) a memory for storing a color temperature data of a flash light; (b) detecting means for detecting an ambient color temperature data under a state where the flash light is not emitted; and (c) white balance control means for effecting white balance control of an image signal by using the color temperature data stored in said memory and the ambient color temperature data detected by said detecting means.
Claim 2
Dependent Claim
74 words
An image pickup apparatus, comprising: (a) a memory for storing a color temperature data of a flash light; (b) detecting means for detecting an ambient color temperature data under a state where the flash light is not emitted; and (c) white balance control means for effecting white balance control of an image signal by using the color temperature data stored in said memory and the ambient color temperature data detected by said detecting means.
Claim 3
Dependent Claim
24 words
An apparatus according to claim 1, wherein said detecting means includes a plurality of color sensors which have different spectral characteristics from each other.
Claim 4
Dependent Claim
22 words
An apparatus according to claim 2, wherein said plurality of color sensors include a R color sensor and a B color sensor.
Claim 5
Dependent Claim
18 words
An apparatus according to claim 3, wherein said plurality of color sensors further includes a G color sensor.
Claim 6
Dependent Claim
26 words
An apparatus according to claim 1, wherein said white balance control means includes image sensing means arranged to convert an optical image into an image signal.
Claim 7
Dependent Claim
32 words
An apparatus according to claim 5, wherein said white balance control means is arranged to control relative gains of respective colors contained in the image signal formed by the image sensing means.
Claim 8
Dependent Claim
19 words
An apparatus according to claim 5, further including: a brightness detector for detecting a brightness of an ambient light.
Claim 9
Dependent Claim
26 words
An apparatus according to claim 7, wherein said white balance control means is arranged to control white balance, by using an output of said brightness detector.
Claim 10
Dependent Claim
94 words
An image pickup apparatus, comprising: (a) a memory for storing a color temperature data of a flash light; (b) detecting means for detecting an ambient color temperature data under a state where the flash light is not emitted; (c) brightness detecting means for detecting a brightness of an object; and (d) white balance control means for controlling a white balance of an image signal in accordance with the color temperature data stored in said memory, the ambient color temperature data detected by said detecting means and the brightness detected by said brightness detecting means.
Claim 11
Dependent Claim
94 words
An image pickup apparatus, comprising: (a) a memory for storing a color temperature data of a flash light; (b) detecting means for detecting an ambient color temperature data under a state where the flash light is not emitted; (c) brightness detecting means for detecting a brightness of an object; and (d) white balance control means for controlling a white balance of an image signal in accordance with the color temperature data stored in said memory, the ambient color temperature data detected by said detecting means and the brightness detected by said brightness detecting means.
Claim 12
Dependent Claim
24 words
An apparatus according to claim 9, wherein said detecting means includes a plurality of color sensors which have different spectral characteristics from each other.
Claim 13
Dependent Claim
22 words
An apparatus according to claim 10, wherein said plurality of color sensors include a R color sensor and a B color sensor.
Claim 14
Dependent Claim
18 words
An apparatus according to claim 11, wherein said plurality of color sensors further includes a G color sensor.
Claim 15
Dependent Claim
26 words
An apparatus according to claim 9, wherein said white balance control means includes image sensing means arranged to convert an optical image into an image signal.
Claim 16
Dependent Claim
32 words
An apparatus according to claim 13, wherein said white balance control means is arranged to control relative gains of respective colors contained in the image signal formed by the image sensing means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-18 | 1994-09-17 | 1995-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-18 | 1998-09-17 | 1999-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-18 | 2002-09-17 | 2003-03-19 | $7700.00 | Window Closed / Lapsed |