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US4636844A
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Method of processing a color image signal
Assignee: Canon Inc
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Filing: 1985-02-25
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Granted: 1987-01-13
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Expires: 2005-02-25
Abstract
Abstract A method of processing a color image signal comprising the step of performing a color adjustment by inputting the number of bits for each color in accordance with the concentrations of inhomogeneous color components contained in colorants: cyan, magenta and yellow.
Inventors
- 👤 Takashi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:14
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6016; H04N1/6022; H04N1/6025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
98 words
A method of processing a color image signal, comprising the steps of: obtaining three color digital signals, each representing one of cyan, magenta and yellow, and each consisting of a plurality of bits; selecting a number of bits of each of the three color digital signals to correct the signals in accordance with the intensities of inhomogeneous color components contained in cyan, magenta and yellow colorants represented by the respective color digital signals; and performing a color correction for each of the colorants in response to the signals having the number of bits selected in the selecting step.
Claim 2
Independent Claim
98 words
A method of processing a color image signal, comprising the steps of: obtaining three color digital signals, each representing one of cyan, magenta and yellow, and each consisting of a plurality of bits; selecting a number of bits of each of the three color digital signals to correct the signals in accordance with the intensities of inhomogeneous color components contained in cyan, magenta and yellow colorants represented by the respective color digital signals; and performing a color correction for each of the colorants in response to the signals having the number of bits selected in the selecting step.
Claim 3
Dependent Claim
31 words
A method according to claim 1, wherein each of the selected number of bits consists of the more significant bits from the plurality of bits of its respective digital color signal.
Claim 4
Dependent Claim
33 words
A method according to claim 1 wherein said performing step is carried out using a reference table including memories and the signals having selected numbers of bits are used to address the memories.
Claim 5
Independent Claim
51 words
A method of producing a black signal, comprising the steps of: obtaining three digital color signals, each signal consisting of a plurality of bits; selecting a number of bits from each of said three digital color signal; and obtaining a black signal from signals represented by the selected number of bits.
Claim 6
Independent Claim
51 words
A method of producing a black signal, comprising the steps of: obtaining three digital color signals, each signal consisting of a plurality of bits; selecting a number of bits from each of said three digital color signal; and obtaining a black signal from signals represented by the selected number of bits.
Claim 7
Dependent Claim
54 words
A method according to claim 7, wherein the three digital color signals represent cyan, magenta and yellow and said selecting step includes selecting the number of bits of the magenta digital color signal to be greater than at least one of the selected number of bits of the yellow and cyan digital color signals.
Claim 8
Dependent Claim
31 words
A method according to claim 4, wherein each of the selected number of bits consists of the more significant bits from the plurality of bits of its respective digital color signal.
Claim 9
Dependent Claim
35 words
A method according to claim 4, wherein said selecting step includes selecting each number of bits of its respective signal in accordance with its influence over the brightness of the image producible by the signals.
Claim 10
Dependent Claim
37 words
A method according to claim 4, wherein said obtaining step includes obtaining the black signal by referring to a reference table including a memory and using the signals having selected numbers of bits to address the memories.
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) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |