US4700399A
Expired / Lapsed
US
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Color image processing apparatus
Assignee: Canon Inc
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Filing: 1985-06-05
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Granted: 1987-10-13
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Expires: 2005-06-05
Abstract
Abstract A color image processing apparatus comprises a detector for detecting an edge of an image and a control unit for controlling a black reproduction quantity for the edge in accordance with an output of the detector.
Inventors
- 👤 Tadashi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:58
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/409; H04N1/4092; H04N1/46; H04N1/56; H04N1/58
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
133 words
A color image processing apparatus comprising: generating means for generating a color signal having a plurality of color component signals, black signal detecting means for detecting a black signal from the color component signals; control means adapted to obtain the amount of black reproduction in accordance with the black signal; under color removal means for performing under color removal from each color component signal in accordance with the black signal; and edge detection means for detecting an edge of said color image; wherein said under color removal means controls the amount of under color removal in accordance with the black signal and the output from said edge detection means, and said control means controls the amount of black reproduction in accordance with the black signal and the output from said edge detection means.
Claim 2
Dependent Claim
133 words
A color image processing apparatus comprising: generating means for generating a color signal having a plurality of color component signals, black signal detecting means for detecting a black signal from the color component signals; control means adapted to obtain the amount of black reproduction in accordance with the black signal; under color removal means for performing under color removal from each color component signal in accordance with the black signal; and edge detection means for detecting an edge of said color image; wherein said under color removal means controls the amount of under color removal in accordance with the black signal and the output from said edge detection means, and said control means controls the amount of black reproduction in accordance with the black signal and the output from said edge detection means.
Claim 3
Dependent Claim
28 words
A color image processing apparatus according to claim 1 wherein said black signal detection means includes minimum detection means for detecting a minimum density of component color densities.
Claim 4
Dependent Claim
22 words
A color image processing apparatus according to claim 2 wherein said minimum detection means compares the color component signals with each other.
Claim 5
Dependent Claim
24 words
A color image processing apparatus according to claim 1 wherein said edge detection means detects the edge of the color image by using Laplacian.
Claim 6
Dependent Claim
50 words
A color image processing apparatus according to claim 1 wherein when both the value of the black signal and the output from said edge detection means are great, said under color removal means increases the amount of under color removal and said control means increases the amount of black reproduction.
Claim 7
Dependent Claim
117 words
A color image processing method comprising the steps of: generating a color signal having a plurality of color component signals; detecting a black signal from the color component signals; obtaining the amount of black reproduction in accordance with the black signal; performing under color removal from each color component signal in accordance with the black signal; and detecting an edge of said color image; wherein in said performing step, the amount of under color removal is performed in accordance with the black signal and the output from said edge detecting step; and in said obtaining step, the amount of black reproduction is obtained in accordance with the black signal and the output from said edge detecting step.
Claim 8
Dependent Claim
117 words
A color image processing method comprising the steps of: generating a color signal having a plurality of color component signals; detecting a black signal from the color component signals; obtaining the amount of black reproduction in accordance with the black signal; performing under color removal from each color component signal in accordance with the black signal; and detecting an edge of said color image; wherein in said performing step, the amount of under color removal is performed in accordance with the black signal and the output from said edge detecting step; and in said obtaining step, the amount of black reproduction is obtained in accordance with the black signal and the output from said edge detecting step.
Claim 9
Dependent Claim
24 words
A color image processing method according to claim 6 wherein said edge detection step detects the edge of the color image by using Laplacian.
Claim 10
Dependent Claim
28 words
A color image processing method according to claim 6 wherein said detecting step includes a minimum detection step for detecting a minimum density of the component color signals.
Claim 11
Dependent Claim
20 words
A color image processing method according to claim 8 wherein said minimum step compares the component signals with each other.
Claim 12
Dependent Claim
52 words
A color image processing method according to claim 6 wherein when both the value of the black signal and the output from said edge detecting step are great, the amount of under color removal is increased in said performing step and the amount of black reproduction is increased in said obtaining step.
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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) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |