US5087126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of estimating colors for color image correction
Assignee: Konica Minolta Inc
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Filing: 1990-02-27
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Granted: 1992-02-11
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Expires: 2010-02-27
Abstract
Abstract In a method of estimating colors of this invention, a combination of fundamental colors (x y z . . . ), which corresponds to a target color in a colorimetric system, is calculated by using the following equation: ##EQU1## where (x i ', y i ', z i ', . . . ) (i=1 to (n+1)) are values of (n +1) vertexes of a division space, which surround the target value in the colorimetric system, (x i , y i , z i , . . . ) (where i=1 to (n+1)) are values of vertexes of a division space of a fundamental color coordinate system corresponding to the division space in the colorimetric system, and (x', y', z', . . . ) is a value of the target color in the colorimetric system.
Inventors
- 👤 Hung Pochieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:43
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6016; H04N1/6019; G; G01; G01J; G01J3/00; G01J3/46; G01J3/462
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
94 words
A method of estimating colors, comprising the steps of: performing colorimetry of a plurality of colors obtained by combining n fundamental colors, where n is an integer of not less than 2; converting values obtained by the colorimetry into values in a predetermined colorimetric system; and calculating a combination of fundamental colors, which corresponds to a target color in the colorimetric system, by using a combination of n+1 values in the colorimetric system which surround the target value in the colorimetric system and fundamental colors corresponding to the n+1 values in the colorimetric system.
Claim 2
Independent Claim
94 words
A method of estimating colors, comprising the steps of: performing colorimetry of a plurality of colors obtained by combining n fundamental colors, where n is an integer of not less than 2; converting values obtained by the colorimetry into values in a predetermined colorimetric system; and calculating a combination of fundamental colors, which corresponds to a target color in the colorimetric system, by using a combination of n+1 values in the colorimetric system which surround the target value in the colorimetric system and fundamental colors corresponding to the n+1 values in the colorimetric system.
Claim 3
Independent Claim
172 words
A method of estimating colors, comprising the steps of: performing colorimetry of a plurality of colors obtained by combining n fundamental colors, where n is an integer not less than 2; converting values obtained by colorimetry into values of a predetermined colorimetric system; and calculating a combination of fundamental colors, which corresponds to a target color in the colorimetric system, by using the converted values in the colorimetric system, wherein the combination of fundamental colors (x,y,z, . . . ), which corresponds to the target color in the colorimetric system, is calculated by using the following equation: ##EQU5## where xi',yi',zi', . . . and (i=1 to (n+1)) are values of n+1 vertices of a division space, which surround the target value in the colorimetric system; xi,yi,zi, . . . and (i=1 to (n+1)) are values of vertices of a division space of a fundamental color coordinate system corresponding to the division space in the colorimetric system; and x',y',z', . . . is a value of the target color in the colorimetric system.
Claim 4
Independent Claim
172 words
A method of estimating colors, comprising the steps of: performing colorimetry of a plurality of colors obtained by combining n fundamental colors, where n is an integer not less than 2; converting values obtained by colorimetry into values of a predetermined colorimetric system; and calculating a combination of fundamental colors, which corresponds to a target color in the colorimetric system, by using the converted values in the colorimetric system, wherein the combination of fundamental colors (x,y,z, . . . ), which corresponds to the target color in the colorimetric system, is calculated by using the following equation: ##EQU5## where xi',yi',zi', . . . and (i=1 to (n+1)) are values of n+1 vertices of a division space, which surround the target value in the colorimetric system; xi,yi,zi, . . . and (i=1 to (n+1)) are values of vertices of a division space of a fundamental color coordinate system corresponding to the division space in the colorimetric system; and x',y',z', . . . is a value of the target color in the colorimetric system.
Claim 5
Dependent Claim
20 words
A method according to claim 2, wherein values of the colorimetric system include values which are added by interpolation processing.
Claim 6
Dependent Claim
90 words
A method according to claim 2, wherein when a target color of the colorimetric system is located outside a range of a colorimetric system formed on the basis of the plurality of colors obtained by combining the n fundamental colors, a value of the target color is changed in an achromatic color direction, and a value of an intersection of a line extending in the achromatic color direction and a boundary of the range or a value located within the range is used as a value of the target value.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |