US4823185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colorimetric circuit with storage of simultaneously detected color components
Assignee: Canon Inc
•
Filing: 1987-10-27
•
Granted: 1989-04-18
•
Expires: 2007-10-27
Abstract
Abstract A colorimetric circuit comprising three detectors for detecting red, green and blue components respectively, a memory for storing the outputs of the detectors sampled at the same instant in logarithmically compressed form, and a control circuit for reading out the contents of the memory in sequence, thereby it being made possible to improve the accuracy of colorimetry.
Inventors
- 👤 Ryosuke Miyamoto
- 👤 Shinji Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:41
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/80; H04N23/84; H04N23/88
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
45 words
A colorimetric circuit comprising a plurality of detecting portions for detecting different color components from each other, memory means for memorizing detection outputs of said detecting portions at the same instant, and control means for taking out an output of said memory means in sequence.
Claim 2
Dependent Claim
45 words
A colorimetric circuit comprising a plurality of detecting portions for detecting different color components from each other, memory means for memorizing detection outputs of said detecting portions at the same instant, and control means for taking out an output of said memory means in sequence.
Claim 3
Dependent Claim
14 words
A colorimetric circuit according to claim 1 wherein said memory means includes a capacitor.
Claim 4
Dependent Claim
20 words
A colorimetric circuit according to claim 1 wherein said memory means memorizes logarithmically compressed detection outputs of said detecting portions.
Claim 5
Dependent Claim
40 words
A colorimetric circuit according to claim 1, wherein said detecting portions each include a plurality of detecting elements connected to a common output, said plurality of detecting elements being arranged in a positional relationship of rotation symmetry to each other.
Claim 6
Dependent Claim
17 words
A colorimetric circuit according to claim 4 wherein areas of said detecting portions differ from each other.
Claim 7
Dependent Claim
45 words
A circuit according to claim 1 wherein said circuit receives incoming color image signals, further comprising color balance control means receptive of said color image signals for controlling a color balance of said color image signals in accordance with an output of said control means.
Claim 8
Dependent Claim
59 words
An image pickup apparatus comprising: (a) a plurality of detecting means for detecting different color components from each other; (b) at least a capacitor having its poles connected to output signals of predetermined two of said plurality of detecting means; and (c) color temperature information forming means for forming color temperature information from a signal stored on said capacitor.
Claim 9
Dependent Claim
59 words
An image pickup apparatus comprising: (a) a plurality of detecting means for detecting different color components from each other; (b) at least a capacitor having its poles connected to output signals of predetermined two of said plurality of detecting means; and (c) color temperature information forming means for forming color temperature information from a signal stored on said capacitor.
Claim 10
Dependent Claim
30 words
An apparatus according to claim 7, wherein said plurality of detecting means includes at least detecting means for detecting a red component and detecting means for detecting a blue component.
Claim 11
Dependent Claim
19 words
An apparatus according to claim 8, wherein said detecting means further includes detecting means for detecting a green component.
Claim 12
Dependent Claim
24 words
An apparatus according to claim 7, further comprising first switch means for applying outputs of said plurality of detecting means selectively to said capacitor.
Claim 13
Dependent Claim
23 words
An apparatus according to claim 7, further comprising second switch means for connecting said color temperature information forming means to said capacitor selectively.
Claim 14
Dependent Claim
48 words
An apparatus according to claim 7, further comprising control means for performing successively a first mode in which outputs of said detecting means are applied to said capacitor and a second mode in which a signal of said capacitor is applied to said color temperature information forming means.
Claim 15
Dependent Claim
24 words
An apparatus according to claim 12, wherein said color temperature information forming means includes memory means for storing a signal inputted from said capacitor.
Claim 16
Dependent Claim
34 words
An apparatus according to claim 7, wherein said plurality of detecting means each include a plurality of detecting elements connected to a common output, said plurality of detecting elements being arranged in dispersed relation.
Claim 17
Dependent Claim
38 words
An apparatus according to claim 14, wherein an area of said commonly connected detecting elements of one of said plurality of detecting means differs from an area of that of another one of said plurality of detecting means.
Claim 18
Dependent Claim
30 words
An apparatus according to claim 15, wherein said plurality of detecting means includes at least detecting means for detecting a red component and detecting means for detecting a blue component.
Claim 19
Dependent Claim
31 words
An apparatus according to claim 16, wherein an area of said detecting means for detecting a blue component is wider than that of said detecting means for detecting a red component.
References Cited (Backward Citations)
US4414635A
Cited
JPS55135721A
Cited
JPS55165085A
Cited
US4395730A
Cited
US4616253A
Cited
US4633300A
Cited
US4660075A
Cited
JPS60192485A
Cited
US4646161A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |