US4683492A
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US
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Method and apparatus for recording a full-color image with a plurality of colorants on the basis of a set of area factors for the colorants selected from a plurality of sets of area factors calculated from a plurality of sets of equations
Assignee: Canon Inc
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Filing: 1984-03-05
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Granted: 1987-07-28
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Expires: 2004-03-05
Abstract
Abstract A color recording method allows digital color recording by calculating fractional areas to be covered by each color used in recording. A plurality of sets of area factors for the colors are calculated from a plurality of sets of color equations corresponding to a plurality of sets of magnitude relationships between the area factors. One set of area factors having the same magnitude relationships as the set of magnitude relationships corresponding to the set of color equations from which the one set of area factors was calculated is selected for color image production. The colors can consist, for example, of three subtractive primary colors or of black and two subtractive primary colors, in different superposition combinations. A color recording apparatus has a camera, a processor, a memory and a printer. Reflectivities of inks of different colors are measured and substituted in the color equations. An optimum color image is produced, compensated for differences between input and output system characteristics.
Inventors
- 👤 Susumu Sugiura
- 👤 Yasuo Kohzato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:37
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6016; H04N1/50
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
146 words
A method for recording a full-color image comprising a plurality of pixels, the method comprising the steps of: detecting levels of three additive primary colors of red, green and blue for each pixel of the image; calculating an area factor for each of three subtractive primary colors of yellow, magenta and cyan in response to the levels of the three additive primary colors; and forming output pixels in response to the area factors obtained in said calculating step; wherein in said calculating step a plurality of sets of area factors are calculated from a plurality of sets of equations corresponding to a plurality of sets of magnitude relationships between area factors, and one set of area factors having the same magnitude relationships as the set of magnitude relationships corresponding to the set of equations from which said one set of area factors was calculated is selected.
Claim 2
Independent Claim
146 words
A method for recording a full-color image comprising a plurality of pixels, the method comprising the steps of: detecting levels of three additive primary colors of red, green and blue for each pixel of the image; calculating an area factor for each of three subtractive primary colors of yellow, magenta and cyan in response to the levels of the three additive primary colors; and forming output pixels in response to the area factors obtained in said calculating step; wherein in said calculating step a plurality of sets of area factors are calculated from a plurality of sets of equations corresponding to a plurality of sets of magnitude relationships between area factors, and one set of area factors having the same magnitude relationships as the set of magnitude relationships corresponding to the set of equations from which said one set of area factors was calculated is selected.
Claim 3
Dependent Claim
21 words
A method according to claim 1, wherein said output pixels are formed by overlapping dots of the three subtractive primary colors.
Claim 4
Dependent Claim
18 words
A method according to claim 1, wherein said plurality of sets of equations comprises six sets of equations.
Claim 5
Independent Claim
152 words
A method for recording a full-color image comprising a plurality of pixels, the method comprising the steps of: detecting levels of three additive primary colors of red, green and blue for each pixel of the image; calculating in response to the levels of the three additive primary colors area factors for three colors, consisting of black and two of the three subtractive primary colors of yellow, magenta and cyan; and forming output pixels in response to the area factors obtained in said calculating step wherein in said calculating step a plurality of sets of area factors are calculated from a plurality of sets of equations corresponding to a plurality of sets of magnitude relationships between area factors, and one set of area factors having the same magnitude relationships as the set of magnitude relationships corresponding to the set of equations from which said one set of area factors was calculated is selected.
Claim 6
Independent Claim
152 words
A method for recording a full-color image comprising a plurality of pixels, the method comprising the steps of: detecting levels of three additive primary colors of red, green and blue for each pixel of the image; calculating in response to the levels of the three additive primary colors area factors for three colors, consisting of black and two of the three subtractive primary colors of yellow, magenta and cyan; and forming output pixels in response to the area factors obtained in said calculating step wherein in said calculating step a plurality of sets of area factors are calculated from a plurality of sets of equations corresponding to a plurality of sets of magnitude relationships between area factors, and one set of area factors having the same magnitude relationships as the set of magnitude relationships corresponding to the set of equations from which said one set of area factors was calculated is selected.
Claim 7
Dependent Claim
18 words
A method according to claim 4, wherein said plurality of sets of equations comprises six sets of equations.
Claim 8
Dependent Claim
48 words
A method according to claim 4, wherein said output pixels are formed by dots of black and the two subtractive primary colors, and wherein the position of the black dot within each output pixel is different from the positions of the dots of the two subtractive primary colors.
Claim 9
Dependent Claim
21 words
A method according to claim 6, wherein the dots of the two subtractive primary colors are formed in an overlapping manner.
Claim 10
Independent Claim
154 words
An apparatus for recording a full-color image comprising a plurality of pixels, the apparatus comprising: entering means for entering levels of three additive primary colors of red, green and blue for each pixel of the image; calculating means for calculating an area factor for each of three subtractive primary colors of yellow, magenta and cyan in response to the levels of the three additive primary colors entered by said entering means; and forming means for forming output pixels in response to the area factors obtained by said calculating means; wherein said calculating means calculates a plurality of sets of area factors from a plurality of sets of equations corresponding to a plurality of sets of magnitude relationships between area factors, and selects one set of area factors having the same magnitude relationships as the set of magnitude relationships corresponding to the set of equations from which said one set of area factors was calculated.
Claim 11
Independent Claim
154 words
An apparatus for recording a full-color image comprising a plurality of pixels, the apparatus comprising: entering means for entering levels of three additive primary colors of red, green and blue for each pixel of the image; calculating means for calculating an area factor for each of three subtractive primary colors of yellow, magenta and cyan in response to the levels of the three additive primary colors entered by said entering means; and forming means for forming output pixels in response to the area factors obtained by said calculating means; wherein said calculating means calculates a plurality of sets of area factors from a plurality of sets of equations corresponding to a plurality of sets of magnitude relationships between area factors, and selects one set of area factors having the same magnitude relationships as the set of magnitude relationships corresponding to the set of equations from which said one set of area factors was calculated.
Claim 12
Dependent Claim
21 words
An apparatus according to claim 8, wherein said output pixels are formed by overlapping dots of the three subtractive primary colors.
Claim 13
Dependent Claim
18 words
An apparatus according to claim 8, wherein said plurality of sets of equations comprises six sets of equations.
Claim 14
Independent Claim
155 words
An apparatus for recording a full-color image comprising a plurality of pixels, the apparatus comprising: entering means for entering levels of three additive primary colors of red, green and blue for each pixel of the image; calculating means for calculating in response to the levels of the three additive primary colors area factors for three colors, consisting of black and two of the three subtractive primary colors of yellow, magenta and cyan; and forming means for forming output pixels in response to the area factors obtained by said calculating means; wherein said calculating means calculates a plurality of sets of area factors from a plurality of sets of equations corresponding to a plurality of sets of magnitude relationships between area factors, and selects one set of area factors having the same magnitude relationships as the set of magnitude relationships corresponding to the set of equations from which said one set of area factors was calculated.
Claim 15
Independent Claim
155 words
An apparatus for recording a full-color image comprising a plurality of pixels, the apparatus comprising: entering means for entering levels of three additive primary colors of red, green and blue for each pixel of the image; calculating means for calculating in response to the levels of the three additive primary colors area factors for three colors, consisting of black and two of the three subtractive primary colors of yellow, magenta and cyan; and forming means for forming output pixels in response to the area factors obtained by said calculating means; wherein said calculating means calculates a plurality of sets of area factors from a plurality of sets of equations corresponding to a plurality of sets of magnitude relationships between area factors, and selects one set of area factors having the same magnitude relationships as the set of magnitude relationships corresponding to the set of equations from which said one set of area factors was calculated.
Claim 16
Dependent Claim
18 words
An apparatus according to claim 11, wherein said plurality of sets of equations comprises six sets of equations.
Claim 17
Dependent Claim
48 words
An apparatus according to claim 11, wherein said output pixels are formed by dots of black and the two subtractive primary colors, and wherein the position of the black dot within each output pixel is different from the positions of the dots of the two subtractive primary colors.
Claim 18
Dependent Claim
21 words
An apparatus according to claim 13, wherein the dots of the two subtractive primary colors are formed in an overlapping manner.
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) | 1990-07-27 | 1991-01-26 | 1991-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-27 | 1995-01-26 | 1995-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-27 | 1999-01-26 | 1999-07-28 | $7700.00 | Window Closed / Lapsed |