US4833525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed color balance adjusting device capable of compensating for a flickering light source
Assignee: Canon Inc
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Filing: 1988-10-07
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Granted: 1989-05-23
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Expires: 2008-10-07
Abstract
Abstract A device performs color balance adjustment on the basis of color temperature information obtained by adding up measured color information outputs sampled from color sensors which obtain measured color information from an object to be photographed.
Inventors
- 👤 Masao Suzuki
- 👤 Seiji Hashimoto
- 👤 Akihiko Tojo
- 👤 Tsutomu Takayama
- 👤 Toshio Kaji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:18
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/80; H04N23/84; H04N23/88
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
81 words
A color temperature information forming device, comprising: (a) color temperature signal producing means which detects colors of an object and produces a color temperature signal according to the detected colors; (b) sampling means for sampling said color temperature signal at predetermined time intervals; (c) means for preventing folding distortion from arising at the time of said sampling, said preventing means being disposed before said sampling means; and (d) computing means for performing a computation on said sampled color temperature signal samples.
Claim 2
Dependent Claim
81 words
A color temperature information forming device, comprising: (a) color temperature signal producing means which detects colors of an object and produces a color temperature signal according to the detected colors; (b) sampling means for sampling said color temperature signal at predetermined time intervals; (c) means for preventing folding distortion from arising at the time of said sampling, said preventing means being disposed before said sampling means; and (d) computing means for performing a computation on said sampled color temperature signal samples.
Claim 3
Dependent Claim
29 words
A device according to claim 1, wherein said computing means is arranged to compute and obtain an average value of a plurality of said sampled color temperature signal samples.
Claim 4
Dependent Claim
39 words
A device according to claim 1, wherein said color temperature signal producing means is arranged to detect different color components of light of said object and to produce a signal corresponding to a ratio between said detected color components.
Claim 5
Dependent Claim
15 words
A device according to claim 1, wherein said color temperature signal are logarithmically compressed signal.
Claim 6
Dependent Claim
29 words
A device according to claim 4, wherein said color temperature signal are obtained by logarithmically compressing a ratio between red and blue components of the light of said object.
Claim 7
Dependent Claim
46 words
A device according to claim 1, wherein said computing means is arranged to perform a computation on said sampled color temperature signal samples sampled during a length of time which is an integer number times as long as a period at which a fluorescent light flickers.
Claim 8
Dependent Claim
26 words
A device according to claim 6, wherein said computing means is arranged to compute and obtain an average value of said sampled color temperature signal samples.
Claim 9
Dependent Claim
39 words
A device according to claim 6, wherein said color temperature signal producing means is arranged to detect different color components of light of said object and to produce a signal corresponding to a ratio between said detected color components.
Claim 10
Dependent Claim
30 words
A device according to claim 1, wherein said sampling means is arranged to perform sampling in a cycle shorter than 1/2 of a flickering cycle of a flickering light source.
Claim 11
Dependent Claim
39 words
A device according to claim 9, wherein said color temperature signal producing means is arranged to detect different color components of light of said object and to produce a signal corresponding to a ratio between said detected color components.
Claim 12
Dependent Claim
133 words
An image sensing apparatus comprising: (a) means for converting an image of an object to be photographed into a video signal including a plurality of color components; (b) color temperature signal producing means arranged to detect colors of said object's image and to produce a color temperature signal corresponding to said detected colors; (c) sampling means for sampling said color temperature signal at predetermined time intervals; (d) means for preventing a folding distortion from arising during said sampling, said preventing means being disposed before said sampling means; (e) computing means for performing a computation on said sampled color temperature signal samples; and (f) control means for controlling a ratio between said plurality of color components of said video signal on the basis of the result of said computation performed by said computing means.
Claim 13
Dependent Claim
133 words
An image sensing apparatus comprising: (a) means for converting an image of an object to be photographed into a video signal including a plurality of color components; (b) color temperature signal producing means arranged to detect colors of said object's image and to produce a color temperature signal corresponding to said detected colors; (c) sampling means for sampling said color temperature signal at predetermined time intervals; (d) means for preventing a folding distortion from arising during said sampling, said preventing means being disposed before said sampling means; (e) computing means for performing a computation on said sampled color temperature signal samples; and (f) control means for controlling a ratio between said plurality of color components of said video signal on the basis of the result of said computation performed by said computing means.
Claim 14
Dependent Claim
29 words
An apparatus according to claim 11, wherein said computing means is arranged to compute and obtain an average value of a plurality of said sampled color temperature signal samples.
Claim 15
Dependent Claim
39 words
An apparatus according to claim 11, wherein said color temperature signal producing means is arranged to detect different color components of light of said object and to produce a signal corresponding to a ratio between said detected color components.
Claim 16
Dependent Claim
15 words
An apparatus according to claim 11, wherein said color temperature signal are logarithmically compressed signal.
Claim 17
Dependent Claim
29 words
An apparatus according to claim 14, wherein said color temperature signal are obtained by logarithmically compressing a ratio between red and blue components of the light of said object.
Claim 18
Dependent Claim
45 words
An apparatus according to claim 11, wherein said computing means is arranged to perform said computation on said sampled color temperature signal samples during a length of time which is an integer number times as long as a period at which a fluorescent light flickers.
Claim 19
Dependent Claim
26 words
An apparatus according to claim 16, wherein said computing means is arranged to compute and obtain an average value of said sampled color temperature signal samples.
Claim 20
Dependent Claim
39 words
An apparatus according to claim 16, wherein said color temperature signal producing means is arranged to detect different color components of light of said object and to produce a signal corresponding to a ratio between said detected color components.
Claim 21
Dependent Claim
30 words
An apparatus according to claim 11, wherein said sampling means is arranged to perform sampling in a cycle shorter than 1/2 of the flickering cycle of a flickering light source.
Claim 22
Dependent Claim
39 words
An apparatus according to claim 19, wherein said color temperature signal producing means is arranged to detect different color components of light of said object and to produce a signal corresponding to a ratio between said detected color components.
Claim 23
Dependent Claim
52 words
An apparatus according to claim 11, wherein said control means includes: (a) amplifying means for amplifying said plurality of color components of said video signal; and (b) means for controlling the degree of amplification by said amplifying means on the basis of the result of said computation performed by said computing means.
Claim 24
Dependent Claim
22 words
An apparatus according to claim 21, wherein said amplifying means is arranged to amplify red and blue components of said video signal.
Claim 25
Dependent Claim
131 words
An image sensing apparatus comprising: (a) means for converting an image of an object to be photographed into a video signal including a plurality of color components; (b) color temperature signal producing means arranged to detect colors of said object's image and to produce a color temperature signal corresponding to said detected colors; (c) sampling means for sampling said color temperature signal at predetermined time intervals; (d) computing means for performing a computation on said sampled color temperature signal samples; (e) control means for controlling a ratio between said plurality of color components of said video signal on the basis of the result of said computation performed by said computing means; and (f) synchronizing means for synchronizing said sampling by said sampling means and a converting operation of said converting means.
Claim 26
Dependent Claim
131 words
An image sensing apparatus comprising: (a) means for converting an image of an object to be photographed into a video signal including a plurality of color components; (b) color temperature signal producing means arranged to detect colors of said object's image and to produce a color temperature signal corresponding to said detected colors; (c) sampling means for sampling said color temperature signal at predetermined time intervals; (d) computing means for performing a computation on said sampled color temperature signal samples; (e) control means for controlling a ratio between said plurality of color components of said video signal on the basis of the result of said computation performed by said computing means; and (f) synchronizing means for synchronizing said sampling by said sampling means and a converting operation of said converting means.
Claim 27
Dependent Claim
18 words
An apparatus according to claim 23, wherein said synchronizing means determines a converting period of said converting means.
Claim 28
Dependent Claim
21 words
An apparatus according to claim 23, further comprising means for preventing a folding distortion from arising at the time of sampling.
Claim 29
Dependent Claim
29 words
An apparatus according to claim 23, wherein said computing means is arranged to compute and obtain an average value of a plurality of said sampled color temperature signal samples.
Claim 30
Dependent Claim
36 words
An apparatus according to claim 23, wherein said color temperature signal producing means is arranged to detect different color components of light of said object and to produce a signal corresponding to a ratio between said.
Claim 31
Dependent Claim
15 words
An apparatus according to claim 23, wherein said color temperature signal are logarithmically compressed signal.
Claim 32
Dependent Claim
29 words
An apparatus according to claim 28, wherein said color temperature signals are obtained by logarithmically compressing a ratio between red and blue components of the light of said object.
Claim 33
Dependent Claim
44 words
An apparatus according to claim 23, wherein said computing means is arranged to perform a computation on said sampled color temperature samples during a length of time which is an integer number times as long as a period at which a fluorescent light flickers.
Claim 34
Dependent Claim
26 words
An apparatus according to claim 30, wherein said computing means is arranged to compute and obtain an average value of said sampled color temperature signal samples.
Claim 35
Dependent Claim
30 words
An apparatus according to claim 23, wherein said sampling means is arranged to perform sampling in a cycle shorter than 1/2 of a flickering cycle of a flickering light source.
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) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |