Patent US2073991A successfully refreshed from Google Patents.
EP0173032A2
Expired / Lapsed
EP
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Digital Color-Image Transformation
Assignee: Polaroid Corp
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Filing: 1985-07-04
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Granted: —
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Expires: 2005-07-04
Abstract
Abstract @ A color transform enables color-image information to be recorded, displayed and otherwise processed with exacting control of color relative to a selected display. The trans- form enables a single-exposure photographic print of image information produced in pre-press equipment to predict with accuracy an ink-on-paper print of that information. Color-image information is transformed with a technique that produces output information for each output color component or other parameter at each point in response to up to all input parameters at that point. The output information may include approximate transform values and finalizing values. The technique can be implemented for real-time conversion with look-up tables storing approximate trans- form values and storing interpolation factors for computing finalizing values.
Inventors
- 👤 Munib Abdulwahab
- 👤 James L. Burkhardt
- 👤 John J. Mccann
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 11:34
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6058; H04N1/6011
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
66 words
A method for determining a transform of color image information for the recordal of the information on a selected object medium with control of color relative to a selected reference medium, said method comprising the step of mapping a color response of said object medium according to a selected colorimetric color space with a color response of said reference medium according to said same color space.
Claim 2
Independent Claim
66 words
A method for determining a transform of color image information for the recordal of the information on a selected object medium with control of color relative to a selected reference medium, said method comprising the step of mapping a color response of said object medium according to a selected colorimetric color space with a color response of said reference medium according to said same color space.
Claim 3
Dependent Claim
25 words
A method according to claim 1 comprising the further step of scaling each said color response on a common basis prior to said mapping step.
Claim 4
Dependent Claim
26 words
A method according to claim 2 in which said scaling step includes normalizing each said color response according to a relative maximal response of that medium.
Claim 5
Dependent Claim
29 words
A method according to claim 2 in which said scaling step includes normalizing the color response of each said medium according to a maximal brightness attainable on that medium.
Claim 6
Dependent Claim
38 words
A method according to claim 2 in which said scaling step includes scaling a selected range of color responses attainable on said object medium with reference to a selected range of color responses attainable on said reference medium.
Claim 7
Dependent Claim
30 words
A method according to claim 2 in which said scaling step includes scaling a selected range of color responses of said object medium with color responses of said reference medium.
Claim 8
Dependent Claim
45 words
A method according to claim 1 A. further comprising the step of determining each said color response according to a common color space that is substantially isotropic throughout a selected gamut and, B. in which said mapping is of said color responses as thus determined.
Claim 9
Dependent Claim
27 words
A method according to claim 1 in which said mapping step includes mapping with a substantially linearized response of said object medium to said selected color space.
Claim 10
Dependent Claim
21 words
A method according to claim 1 including the further step of substantially linearizing each said response prior to said mapping step.
Claim 11
Independent Claim
82 words
A method for determining a transform of color image information for the recordal of the information on a selected object medium with control of color relative to a selected reference medium, said method comprising the steps of A. calibrating the color response of said object medium and the color response of said reference medium on a common basis over a selected gamut, and B. mapping the calibrated color response of said object medium with the calibrated color response of said reference medium.
Claim 12
Independent Claim
82 words
A method for determining a transform of color image information for the recordal of the information on a selected object medium with control of color relative to a selected reference medium, said method comprising the steps of A. calibrating the color response of said object medium and the color response of said reference medium on a common basis over a selected gamut, and B. mapping the calibrated color response of said object medium with the calibrated color response of said reference medium.
Claim 13
Dependent Claim
30 words
A method according to claim 10 in which said calibrating step includes determining each color response according to a common color space and scaling each such color response substantially identically.
Claim 14
Dependent Claim
63 words
A method according to claim 11 in which said scaling step includes A. normalizing said color response of said object medium with reference to a maximal brightness attainable therewith relative to a maximal brightness attainable with said reference medium, and B. scaling a maximal range of color responses of said object medium with a maximal range of color responses of said reference medium.
Claim 15
Dependent Claim
30 words
A method according to claim 10 comprising the further steps of A. selecting said object medium from color photographic media, and B. selecting said reference medium from color printing media.
Claim 16
Dependent Claim
42 words
A method according to claim 10 further characterizing in that said calibrating step includes A. calibrating each said medium with reference to the same colorimetric and isotropic color space, and B. calibrating each said medium according to a substantially common linear basis.
Claim 17
Independent Claim
104 words
A method for transforming given color image information with selected control of color to output information for further image processing, where said given information is on a pixel basis, said method comprising the steps of A. providing an approximate representation, which is of low color exactness, of said output information responsive to more significant measures of said given information, B. responding to less significant measures of given information to provide finalizing values, which identify high color exactness, of said output information, and C. arithmeticly combining said approximate representations with said finalizing values thereof to attain said output information with selected exacting control of color.
Claim 18
Independent Claim
104 words
A method for transforming given color image information with selected control of color to output information for further image processing, where said given information is on a pixel basis, said method comprising the steps of A. providing an approximate representation, which is of low color exactness, of said output information responsive to more significant measures of said given information, B. responding to less significant measures of given information to provide finalizing values, which identify high color exactness, of said output information, and C. arithmeticly combining said approximate representations with said finalizing values thereof to attain said output information with selected exacting control of color.
Claim 19
Dependent Claim
23 words
A method according to claim 15 further characterized in that said providing of finalizing values includes determining interpolation values of said approximate representations.
Claim 20
Dependent Claim
30 words
A method according to claim 16 further characterized in that said providing of interpolation values includes providing a digital store of gradient values between successive values of said approximate representations.
Claim 21
Dependent Claim
91 words
A method according to claim 15 in which said given image information has plural color components and said output image information has plural color components, and further characterized in that A. said providing of an approximate representation provides, for each pixel, a different approximate representation in response to each color component of said given information in the presence of at least one other color component of said given information, and B. said providing of finalizing values provides, for each pixel, finalizing values responsive to plural color components of said given information.
Claim 22
Dependent Claim
97 words
A method according to claim 15 further charactered in that said given image information has (n) color components and said output image information has (m) color components, where (n) and (m) are integers greater than unity, and including the step of producing, for each pixel, each of (m) color components of output information in response to an arithmetic combination of (i) an approximate transform representation responsive to plural color components of said given information, and (ii) plural finalizing values of that approximate transform representation, each of which is responsive to different color components of said given information.
Claim 23
Dependent Claim
108 words
In apparatus for transforming given color image information with selected control of color to output image information, where said given information is on a pixel basis, the improvement comprising A. means for providing an approximate representation, which is of low color exactness, of said output information in response to more significant measures of said given information, B . means for providing finalizing values, which identify high color exactness, of said output information in response to less significant measures of said given information , and C. means for arithmeticly combining said approximate representations and said finalizing values thereof to attain said output information with selected exacting control of color.
Claim 24
Dependent Claim
108 words
In apparatus for transforming given color image information with selected control of color to output image information, where said given information is on a pixel basis, the improvement comprising A. means for providing an approximate representation, which is of low color exactness, of said output information in response to more significant measures of said given information, B . means for providing finalizing values, which identify high color exactness, of said output information in response to less significant measures of said given information , and C. means for arithmeticly combining said approximate representations and said finalizing values thereof to attain said output information with selected exacting control of color.
Claim 25
Dependent Claim
27 words
In apparatus according to claim 20 the further improvement in which said means for providing finalizing values includes means for determining interpolation values of said approximate representations.
Claim 26
Dependent Claim
34 words
In apparatus according to claim 20 the further improvement in which said means for providing finalizing values includes means for providing a digital store of gradient values between successive values of said approximate representations.
Claim 27
Dependent Claim
94 words
In apparatus according to claim 20 in which said given image information has plural color components and said output image information has plural color components, the further improvement in which A. said first providing means includes means for providing, for each pixel, a different approximate representation in response to each color component of said given information in the presence of at least one other color component of said given information, and B. said second providing means includes means for providing, for each pixel, finalizing values responsive to plural color components of said given information.
Claim 28
Dependent Claim
123 words
Apparatus for the recording of digital color image information on a selected object medium with control of color relative to a selected reference medium, said apparatus comprising, in combination A. input means for storing given color image information on a pixel basis, B. output means for receiving transformed color image information for application to recordal on said object medium, and C. color transform means connected for transforming said given image information in said input means to said transformed information in said output means, said transform means producing said transformation in response to a mapping of a color response of said object medium according to a selected colorimetric color space with a color response of said reference medium according to said same color space.
Claim 29
Dependent Claim
123 words
Apparatus for the recording of digital color image information on a selected object medium with control of color relative to a selected reference medium, said apparatus comprising, in combination A. input means for storing given color image information on a pixel basis, B. output means for receiving transformed color image information for application to recordal on said object medium, and C. color transform means connected for transforming said given image information in said input means to said transformed information in said output means, said transform means producing said transformation in response to a mapping of a color response of said object medium according to a selected colorimetric color space with a color response of said reference medium according to said same color space.
Claim 30
Dependent Claim
77 words
Apparatus according to claim 24 in which said transform means includes A. approximate transform means responsive to more significant values of said given information to provide approximate values, with relatively low color exactness, of said transformed information, B. finalizing transform means responsive to said given information to provide finalizing values of said transformed information, and C. means for arithmetically combining said approximate values and said finalizing values to attain said transformed information with selected high color exactness.
Claim 31
Dependent Claim
74 words
Apparatus according to claim 25 in which said transform means further includes A. a first digital store of transform data in said approximate transformation means for producing said approximate values in response to said more significant values of given information, and B. a second digital store in said finalizing means of gradient values between successive approximate values in said first digital store for providing said interpolation finalizing values in response to said given information.
Claim 32
Dependent Claim
124 words
Apparatus for the recording of color image information on a selected object medium with control of color relative to a selected reference medium, said apparatus comprising, in combination A. input means for storing given color image information on a pixel basis, B. output means for receiving transformed color image information for application to recordal on said object medium, and C. color transform means connected for transforming said given image information in said input means to said transformed information in said output means, said transform means producing said transformation in response to a mapping of the scaled color response of said object medium according to a selected colorimetric color space with a scaled color response of said reference medium according to said same color space.
Claim 33
Dependent Claim
124 words
Apparatus for the recording of color image information on a selected object medium with control of color relative to a selected reference medium, said apparatus comprising, in combination A. input means for storing given color image information on a pixel basis, B. output means for receiving transformed color image information for application to recordal on said object medium, and C. color transform means connected for transforming said given image information in said input means to said transformed information in said output means, said transform means producing said transformation in response to a mapping of the scaled color response of said object medium according to a selected colorimetric color space with a scaled color response of said reference medium according to said same color space.
Claim 34
Dependent Claim
168 words
Apparatus for the recording of color image information on a selected object medium with control of color relative to a selected reference medium, said apparatus comprising, in combination A. input means for storing given color image information on a pixel basis, B. output means for receiving transformed color image information for application to recordal on said object medium, and C. color transform means connected for transforming said given image information in said input means to said transformed information in said output means, said transform means producing said transformation in response to a mapping of a scaled and substantially linearized color response of said object medium according to a selected colorimetric and isotropic color space with a scaled and substantially linearized color response of said reference medium according to said same color space, where said scaling includes normalizing each said response according to a relative maximal response of that medium and scaling a selected range of color responses of said object medium with color responses of said reference medium.
Claim 35
Dependent Claim
168 words
Apparatus for the recording of color image information on a selected object medium with control of color relative to a selected reference medium, said apparatus comprising, in combination A. input means for storing given color image information on a pixel basis, B. output means for receiving transformed color image information for application to recordal on said object medium, and C. color transform means connected for transforming said given image information in said input means to said transformed information in said output means, said transform means producing said transformation in response to a mapping of a scaled and substantially linearized color response of said object medium according to a selected colorimetric and isotropic color space with a scaled and substantially linearized color response of said reference medium according to said same color space, where said scaling includes normalizing each said response according to a relative maximal response of that medium and scaling a selected range of color responses of said object medium with color responses of said reference medium.
Claim 36
Dependent Claim
153 words
Apparatus for the recording of color image information on a selected object medium with control of color relative to a selected reference medium, said apparatus comprising, in combination A. input means for storing given color image information on a pixel basis, B. output means for receiving transformed color image information for application to recordal on said object medium, and C. color transform means connected for transforming said given image information in said input means to said transformed information in said output means, said transform means producing said transformation in response to a mapping of a calibrated color response of said object medium with a calibrated color response of said reference medium, where each said calibration of a color response includes determining that color response according to a common color space and scaling each such color response substantially identically over a selected gamut and with reference to a maximal brightness attainable with that medium.
Claim 37
Dependent Claim
153 words
Apparatus for the recording of color image information on a selected object medium with control of color relative to a selected reference medium, said apparatus comprising, in combination A. input means for storing given color image information on a pixel basis, B. output means for receiving transformed color image information for application to recordal on said object medium, and C. color transform means connected for transforming said given image information in said input means to said transformed information in said output means, said transform means producing said transformation in response to a mapping of a calibrated color response of said object medium with a calibrated color response of said reference medium, where each said calibration of a color response includes determining that color response according to a common color space and scaling each such color response substantially identically over a selected gamut and with reference to a maximal brightness attainable with that medium.
Claim 38
Dependent Claim
163 words
In apparatus for transforming given color image information with control of color to output image information, the combination comprising A. means for receiving signals identifying each color component of a set of input color components for each pixel, B. memory means addressed by said received signals and storing, (1) first sets of approximate values of output image information, each first set including values of multiple output color components for defining an output pixel and being a selected transformation of a set of sampled input color components, (2) interpolation value of output color components for said approximate values, C. means responsive to said received signals and to interpolation values from said memory means, for determining finalizing values of a set of approximate values of output color components, and D. means for combining a first set of values and finalizing values for that first set, thereby to produce, for a given input image pixel, a set of output values having selected exacting control of color.
Claim 39
Dependent Claim
163 words
In apparatus for transforming given color image information with control of color to output image information, the combination comprising A. means for receiving signals identifying each color component of a set of input color components for each pixel, B. memory means addressed by said received signals and storing, (1) first sets of approximate values of output image information, each first set including values of multiple output color components for defining an output pixel and being a selected transformation of a set of sampled input color components, (2) interpolation value of output color components for said approximate values, C. means responsive to said received signals and to interpolation values from said memory means, for determining finalizing values of a set of approximate values of output color components, and D. means for combining a first set of values and finalizing values for that first set, thereby to produce, for a given input image pixel, a set of output values having selected exacting control of color.
Claim 40
Dependent Claim
70 words
In apparatus according to claim 30, the further combination wherein A. said means for receiving signals addresses said memory means with more significant measures of said received signals to identify a first set of values and to identify interpolation values, B. said means for determining responds to less significant measures of said received signals for determining with said identified interpolation values, finalizing values for said identified first set of values.
References Cited (Backward Citations)
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