Patent US5483360A successfully refreshed from Google Patents.
US5483360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color printer calibration with blended look up tables
Assignee: Xerox Corp
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Filing: 1994-06-06
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Granted: 1996-01-09
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Expires: 2014-06-06
Abstract
Abstract A color printer, responsive to printer signals to deposit printer colorants on a medium in accordance with printer signals received, is calibrated by operating the color printer with printer signals selected to cause the printer to print color samples on the medium; measuring the color samples to determine a first colorimetric response of the printer to the printer signals using the first measured colorimetric response to generate a first mapping of colorimetric values to printer signals; using the first measured colorimetric response or a subsequent measured colorimetric response to generate at least one additional mapping of colorimetric values to printer signals; storing the first and additional mappings in a color conversion memory producing printer signals as a function of the first and additional mappings stored in the color conversion memory to convert color definitions from a first color space to the printer signals suitable for producing a corresponding response at the color printer.
Inventors
- 👤 Robert J. Rolleston
- 👤 Martin S. Maltz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:53
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40006; H04N1/46; H04N1/56; H04N1/60; H04N1/603; H04N1/6033
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
176 words
A method of calibrating a color printer, the color printer responsive to printer signals to deposit printer colorants on a medium in accordance with printer signals received, including the steps of: operating the color printer with printer signals selected to cause the printer to print color samples on the medium; measuring the color samples to determine a first colorimetric response of the printer to the printer signals; using the first measured colorimetric response to generate a first mapping of colorimetric signals to printer signals; using the first measured colorimetric response or a subsequent measured colorimetric response to generate at least one additional mapping of colorimetric values to printer signals; storing the first and additional mappings in a color conversion memory; producing printer signals as a function of a weighted combination of first and additional mappings stored in the color conversion memory to convert color signals from a first color space to the printer signals suitable for producing a corresponding response at the color printer, wherein at least two mappings contribute non-zero components to said printer signal.
Claim 2
Independent Claim
176 words
A method of calibrating a color printer, the color printer responsive to printer signals to deposit printer colorants on a medium in accordance with printer signals received, including the steps of: operating the color printer with printer signals selected to cause the printer to print color samples on the medium; measuring the color samples to determine a first colorimetric response of the printer to the printer signals; using the first measured colorimetric response to generate a first mapping of colorimetric signals to printer signals; using the first measured colorimetric response or a subsequent measured colorimetric response to generate at least one additional mapping of colorimetric values to printer signals; storing the first and additional mappings in a color conversion memory; producing printer signals as a function of a weighted combination of first and additional mappings stored in the color conversion memory to convert color signals from a first color space to the printer signals suitable for producing a corresponding response at the color printer, wherein at least two mappings contribute non-zero components to said printer signal.
Claim 3
Dependent Claim
17 words
A method as described in claim 1, wherein said colorimetric signals are red, green and blue signals.
Claim 4
Dependent Claim
19 words
A method as described in claim 1, wherein said printer signals correspond to printing cyan, magenta and yellow colorants.
Claim 5
Dependent Claim
20 words
A method as described in claim 1, wherein said printer signals correspond to printing cyan, magenta, yellow and black colorants.
Claim 6
Dependent Claim
25 words
A method as described in claim 1, wherein said printer signals correspond to printing cyan, magenta, yellow and at least one additional different non-black colorant.
Claim 7
Dependent Claim
25 words
A method as described in claim 1, wherein said printer signals correspond to printing cyan, magenta, yellow, black and at least one additional different colorant.
Claim 8
Dependent Claim
85 words
A method as described in claim 1, wherein the step of producing printer signals as a function of the first and additional mappings stored in the color conversion memory does so in accordance with the function: C,M,Y=A1(r,g,b)×LUT1(r,g,b)+A2(r,g,b)×LUT2(r,g,b)+A3(r,g,b).times.LUT3(r,g,b)+ . . . +AN(r,g,b)×LUTN(r,g,b) where C,M,Y is the printer signal produced as a function of the first and additional mappings stored in the color conversion memory, AN is a color space location dependent weight and LUTN(r,g,b) is the first and additional mappings of colorimetric values to printer signals.
Claim 9
Dependent Claim
13 words
The method as described in claim 7 wherein A1+A2+A3 . . . +AN=1.
Claim 10
Dependent Claim
184 words
A color printer including a calibration system, the color printer responsive to printer signals directed thereto to deposit printer colorants on a medium in accordance with printer signals received, comprising: means for generating printer signals selected to cause the printer to print color samples on the medium; means for measuring a first colorimetric response of the printer to the printer signals from the color samples; means for using the first measured colorimetric response to generate a mapping of colorimetric values to printer signals; means for using the first measured colorimetric response or a subsequent measured colorimetric response to generate at least one additional mapping of colorimetric values to printer signals; a color conversion memory; printer control means for storing the first and additional mappings in the color conversion memory; weighting means to producing printer signals as a function of the first and additional mappings stored in the color conversion memory, to convert color definitions from a first color space to printer signals suitable for producing a corresponding response at the color printer, wherein at least two mappings contribute non-zero components to said printer signal.
Claim 11
Dependent Claim
184 words
A color printer including a calibration system, the color printer responsive to printer signals directed thereto to deposit printer colorants on a medium in accordance with printer signals received, comprising: means for generating printer signals selected to cause the printer to print color samples on the medium; means for measuring a first colorimetric response of the printer to the printer signals from the color samples; means for using the first measured colorimetric response to generate a mapping of colorimetric values to printer signals; means for using the first measured colorimetric response or a subsequent measured colorimetric response to generate at least one additional mapping of colorimetric values to printer signals; a color conversion memory; printer control means for storing the first and additional mappings in the color conversion memory; weighting means to producing printer signals as a function of the first and additional mappings stored in the color conversion memory, to convert color definitions from a first color space to printer signals suitable for producing a corresponding response at the color printer, wherein at least two mappings contribute non-zero components to said printer signal.
Claim 12
Dependent Claim
17 words
A device as described in claim 9, wherein said colorimetric signals are red, green and blue signals.
Claim 13
Dependent Claim
19 words
A device as described in claim 9, wherein said printer signals correspond to printing cyan, magenta and yellow colorants.
Claim 14
Dependent Claim
20 words
A device as described in claim 9, wherein said printer signals correspond to printing cyan, magenta, yellow and black colorants.
Claim 15
Dependent Claim
25 words
A device as described in claim 9, wherein said printer signals correspond to printing cyan, magenta, yellow and at least one additional different non-black colorant.
Claim 16
Dependent Claim
25 words
A device as described in claim 9, wherein said printer signals correspond to printing cyan, magenta, yellow, black and at least one additional different colorant.
Claim 17
Dependent Claim
85 words
A device as described in claim 9, wherein the step of producing printer signals as a function of the first and additional mappings stored in the color conversion memory does so in accordance with the function: C,M,Y=A1(r,g,b)×LUT1(r,g,b)+A2(r,g,b)×LUT2(r,g,b)+A3(r,g,b).times.LUT3(r,g,b)+ . . . +AN(r,g,b)×LUTN(r,g,b) where C,M,Y is the printer signal produced as a function of the first and additional mappings stored in the color conversion memory, AN is a color space location dependent weight and LUTN(r,g,b) is the first and additional mappings of colorimetric values to printer signals.
Claim 18
Dependent Claim
13 words
A device as described in claim 15 wherein A1+A2+A3 . . . +AN=1.
Claim 19
Dependent Claim
202 words
A color printer including a calibration system, the color printer responsive to printer signals directed thereto to deposit printer colorants on a medium in accordance with printer signals received, comprising: means for generating printer signals selected to cause the printer to print color samples on the medium; means for measuring a first colorimetric response of the printer to the printer signals from the color samples; means for using the first measured colorimetric response to generate a mapping of colorimetric values to printer signals; means for using the first measured colorimetric response or a subsequent measured colorimetric response to generate at least one additional mapping of colorimetric values to printer signals; a color conversion memory; means for combining at least the first measured colorimetric response and any subsequent measured colorimetric response to produce a color conversion mapping, and storing said color conversion mapping in said color conversion memory; weighting means to producing printer signals as a function of the first and additional mappings stored in the color conversion memory, to convert color definitions from a first color space to printer signals suitable for producing a corresponding response at the color printer, wherein at least two mappings contribute non-zero components to said printer signal.
Claim 20
Dependent Claim
202 words
A color printer including a calibration system, the color printer responsive to printer signals directed thereto to deposit printer colorants on a medium in accordance with printer signals received, comprising: means for generating printer signals selected to cause the printer to print color samples on the medium; means for measuring a first colorimetric response of the printer to the printer signals from the color samples; means for using the first measured colorimetric response to generate a mapping of colorimetric values to printer signals; means for using the first measured colorimetric response or a subsequent measured colorimetric response to generate at least one additional mapping of colorimetric values to printer signals; a color conversion memory; means for combining at least the first measured colorimetric response and any subsequent measured colorimetric response to produce a color conversion mapping, and storing said color conversion mapping in said color conversion memory; weighting means to producing printer signals as a function of the first and additional mappings stored in the color conversion memory, to convert color definitions from a first color space to printer signals suitable for producing a corresponding response at the color printer, wherein at least two mappings contribute non-zero components to said printer signal.
Claim 21
Dependent Claim
17 words
A device as described in claim 17, wherein said colorimetric signals are red, green and blue signals.
Claim 22
Dependent Claim
19 words
A device as described in claim 17 wherein said printer signals correspond to printing cyan, magenta and yellow colorants.
Claim 23
Dependent Claim
20 words
A device as described in claim 17, wherein said printer signals correspond to printing cyan, magenta, yellow and black colorants.
Claim 24
Dependent Claim
25 words
A device as described in claim 17, wherein said printer signals correspond to printing cyan, magenta, yellow and at least one additional different non-black colorant.
Claim 25
Dependent Claim
25 words
A device as described in claim 17, wherein said printer signals correspond to printing cyan, magenta, yellow, black and at least one additional different colorant.
Claim 26
Dependent Claim
85 words
A device as described in claim 17, wherein the step of producing printer signals as a function of the first and additional mappings stored in the color conversion memory does so in accordance with the function: C,M,Y=A1(r,g,b)×LUT1(r,g,b)+A2(r,g,b)×LUT2(r,g,b)+A3(r,g,b).times.LUT3(r,g,b)+ . . . +AN(r,g,b)×LUTN(r,g,b) where C,M,Y is the printer signal produced as a function of the first and additional mappings stored in the color conversion memory, AN is a color space location dependent weight and LUTN(r,g,b) is the first and additional mappings of colorimetric values to printer signals.
Claim 27
Dependent Claim
13 words
A device as described in claim 23 wherein A1+A2+A3 . . . +AN=1.
Claim 28
Independent Claim
112 words
A method of calibrating a color printer responsive to printer signals to deposit printer colorants on a medium in accordance with printer signals received, including the steps of: producing a calibration print as a printer response sample; deriving a first mapping relating colorimetric values to printer response; deriving at least one additional mapping relating colorimetric values to printer response; generating a color conversion mapping as a weighted function of the first and additional mappings and storing said mapping in a color conversion memory, wherein at least two mappings contribute non-zero values to the color conversion; operating the calibrated printer with the color conversion mapping to convert colorimetric values received to printer signals.
Claim 29
Independent Claim
112 words
A method of calibrating a color printer responsive to printer signals to deposit printer colorants on a medium in accordance with printer signals received, including the steps of: producing a calibration print as a printer response sample; deriving a first mapping relating colorimetric values to printer response; deriving at least one additional mapping relating colorimetric values to printer response; generating a color conversion mapping as a weighted function of the first and additional mappings and storing said mapping in a color conversion memory, wherein at least two mappings contribute non-zero values to the color conversion; operating the calibrated printer with the color conversion mapping to convert colorimetric values received to printer signals.
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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) | 1999-01-08 | 1999-07-10 | 2000-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-08 | 2003-07-10 | 2004-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-08 | 2007-07-10 | 2008-01-09 | $7700.00 | Window Closed / Lapsed |