Patent EP0273398A2 successfully refreshed from Google Patents.
EP0273398A2
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EP
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Method of correcting color images
Assignee: Konica Minolta Inc
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Filing: 1987-12-23
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Granted: —
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Expires: 2007-12-23
Abstract
Abstract A color image correction apparatus for correcting each color image data on the basis of a plurality of input color image data and outputting a plurality of corrected color image data, includes at least one memory means for storing color correction data for combinations of the plurality of color image data, and an arithmetic operation circuit. The operation circuit reads out at least two color correction data from said memory means in units of color image data on the basis of the plurality of input color image data and outputs processed data as the corrected color image data.
Inventors
- 👤 Po-Chieh Hung
- 👤 Tatsuya Kaneniwa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 19:47
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/6016; H04N1/6019
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
91 words
A color image correction apparatus for correcting each color image data on the basis of a plurality of input color image data and outputting a plurality of corrected color image data, comprising memory means for storing color correction data for combinations of the plurality of color image data, and processing means for reading out at least two color correction data from said memory means in units of color image data on the basis of the plurality of input color image data and for outputting processed data as corrected color image data.
Claim 2
Dependent Claim
91 words
A color image correction apparatus for correcting each color image data on the basis of a plurality of input color image data and outputting a plurality of corrected color image data, comprising memory means for storing color correction data for combinations of the plurality of color image data, and processing means for reading out at least two color correction data from said memory means in units of color image data on the basis of the plurality of input color image data and for outputting processed data as corrected color image data.
Claim 3
Dependent Claim
55 words
An apparatus according to claim 1, wherein the color correction data stored in said memory means are color correction data for the combinations of the color image data located at vertices of a plurality of space regions obtained by dividing a color space expressed by all combinations of the plurality of input color image data.
Claim 4
Dependent Claim
47 words
An apparatus according to claim 2, wherein said processing means comprises weighting data output means for outputting weighting data of each color correction data read out from said memory means and performs processing on the basis of the readout color correction data and the corresponding weighting data.
Claim 5
Dependent Claim
23 words
An apparatus according to claim 3, wherein said processing means performs processing using eight color correction data read out from said memory means.
Claim 6
Dependent Claim
32 words
An apparatus according to claim 4, wherein said processing means performs processing on the basis of the eight color correction data read out from said memory means and the corresponding weighting data.
Claim 7
Independent Claim
76 words
A method of correcting a color image, which corrects each color separation image data on the basis of a plurality of input color image data, comprising the steps of reading out from memory means at least two of a plurality of color correction data for each color image data on the basis of combinations of the plurality of color image data, and obtaining color correction data corrected by said readout at least two color correction data.
Claim 8
Independent Claim
76 words
A method of correcting a color image, which corrects each color separation image data on the basis of a plurality of input color image data, comprising the steps of reading out from memory means at least two of a plurality of color correction data for each color image data on the basis of combinations of the plurality of color image data, and obtaining color correction data corrected by said readout at least two color correction data.
Claim 9
Dependent Claim
53 words
A method according to claim 6, wherein the color correction data stored in the memory means are color correction data for combinations of color image data located at vertices of a plurality of space regions obtained by dividing a color space expressed by all combinations of the plurality of input color image data.
Claim 10
Dependent Claim
18 words
A method according to claim 7, wherein eight color correction data are read out from the memory means.
Claim 11
Dependent Claim
33 words
A method according to claim 8, wherein weighting data are multiplied with the eight color correction data read out from the memory means or products are added to calculate new color image data.
Claim 12
Dependent Claim
78 words
A color image correction apparatus, comprising memory means for storing color correction data corresponding to all combinations of upper bits excluding a least significant bit of a plurality of color image data input as a digital signal, means for reading out at least two color correction data from said memory means, and arithmetic means for averaging the readout color correction data, said arithmetic means being adapted to produce color correction data corresponding to the input color image data.
Claim 13
Dependent Claim
78 words
A color image correction apparatus, comprising memory means for storing color correction data corresponding to all combinations of upper bits excluding a least significant bit of a plurality of color image data input as a digital signal, means for reading out at least two color correction data from said memory means, and arithmetic means for averaging the readout color correction data, said arithmetic means being adapted to produce color correction data corresponding to the input color image data.
Claim 14
Dependent Claim
50 words
An apparatus according to claim 10, wherein said color correction data readout means reads out color correction data corresponding to combinations of color image data input as the digital signal and color correction data corresponding to a combination of color image data obtained by rounding up the least significant bit.
Claim 15
Dependent Claim
103 words
A color image correction apparatus comprising a memory for outputting beforehand a plurality of combinations of reproduction colors obtained by combinations of a plurality of basic colors, calculating values of a display color system which correspond to the combinations, and storing predetermined values as mixing ratios of the basic colors for intermediate colors to be obtained, the predetermined values being obtained by interpolation and arithmetic operations of the values of the color system, wherein color correction data stored in said memory is accessed in response to input color image data, thereby obtaining corrected color image data corresponding to the input color image data.
Claim 16
Dependent Claim
103 words
A color image correction apparatus comprising a memory for outputting beforehand a plurality of combinations of reproduction colors obtained by combinations of a plurality of basic colors, calculating values of a display color system which correspond to the combinations, and storing predetermined values as mixing ratios of the basic colors for intermediate colors to be obtained, the predetermined values being obtained by interpolation and arithmetic operations of the values of the color system, wherein color correction data stored in said memory is accessed in response to input color image data, thereby obtaining corrected color image data corresponding to the input color image data.
Claim 17
Dependent Claim
100 words
An apparatus according to claim 12, wherein said memory stores target values as the mixing ratios of the basic colors for reproducing intermediate colors to be obtained, each target value being obtained such that space regions including the intermediate color as a target and obtained by dividing a color space defined by the values of the color system are sequentially divided so as to reduce the space region including the intermediate color as the target, and a value of the color system for a final space region including the intermediate color corresponds to a coordinate system including the target value.
Claim 18
Dependent Claim
128 words
A color image correction apparatus comprising a memory for storing target values as mixing ratios of basic colors for reproducing intermediate colors to be obtained, each target value being obtained such that a value of a color system which is close to the intermediate color as a target set in the color system is sequentially converged in a one-to-one correspondence with a value in a coordinate system constituted by the basic colors, and a value of the color system which is closest to the intermediate color as the target corresponds to the coordinate system including the target value, wherein color correction data stored in said memory is accessed in response to input color image data, thereby obtaining corrected color image data corresponding to the input color image data.
Claim 19
Dependent Claim
128 words
A color image correction apparatus comprising a memory for storing target values as mixing ratios of basic colors for reproducing intermediate colors to be obtained, each target value being obtained such that a value of a color system which is close to the intermediate color as a target set in the color system is sequentially converged in a one-to-one correspondence with a value in a coordinate system constituted by the basic colors, and a value of the color system which is closest to the intermediate color as the target corresponds to the coordinate system including the target value, wherein color correction data stored in said memory is accessed in response to input color image data, thereby obtaining corrected color image data corresponding to the input color image data.
Claim 20
Independent Claim
74 words
A method of correcting a color image, comprising the steps of outputting beforehand a plurality of combinations of reproduction colors which are obtained by combinations of a plurality of basic colors, performing interpolation and arithmetic operations by using values of a color system which correspond to the reproduction colors obtained by the plurality of combinations, and obtaining combinations of the plurality of basic colors on the basis of the values of the color system.
Claim 21
Independent Claim
74 words
A method of correcting a color image, comprising the steps of outputting beforehand a plurality of combinations of reproduction colors which are obtained by combinations of a plurality of basic colors, performing interpolation and arithmetic operations by using values of a color system which correspond to the reproduction colors obtained by the plurality of combinations, and obtaining combinations of the plurality of basic colors on the basis of the values of the color system.
Claim 22
Dependent Claim
96 words
A method according to claim 15, wherein the interpolation and arithmetic operations are performed such that space regions of the color system which include an intermediate color as a target and are defined in a color space expressed by the values of the display color system are sequentially divided to reduce a space region including the intermediate color as the target, and target values of a coordinate system which correspond to the values of the color system for a final space region are corrected as the combinations of the basic colors for reproducing the intermediate color.
Claim 23
Dependent Claim
120 words
A method according to claim 15, wherein the interpolation and arithmetic operations are performed such that when the plurality of basic colors constituting a color image are mixed to reproduce an intermediate color of a given color system, a value of the color system which is close to the intermediate color as a target set in the color system is sequentially converged in a one-to-one correspondence with a value of a coordinate system constituted by the basic colors, and the target value of the coordinate system which corresponds to the value of the color system which is the closest to the intermediate color as the target is corrected as a combination of the basic colors for reproducing the intermediate color.
Claim 24
Dependent Claim
35 words
A method according to claim 15, 16, or 17, wherein a plurality of colors as a result of different combinations of each color image data are reproduced as color patch images on a recording medium.
Claim 25
Dependent Claim
29 words
A method according to claim 18, wherein the plurality of colors include all colors reproduced by combinations of maximum and minimum signal values of at least color image data.
Claim 26
Dependent Claim
24 words
A method according to claim 18, wherein the color image data includes electrical signals respectively corresponding to yellow (Y), magenta (M), and cyan (C).
Claim 27
Dependent Claim
29 words
A method according to claim 18, wherein signal counts PY, PM, and PC used in combinations of Y, M, and C satisfy a condition: PY < PC ≦ PM.
Claim 28
Dependent Claim
16 words
A method according to claim 18, wherein the recording medium is a color photographic light-sensitive material.
Claim 29
Dependent Claim
78 words
A method according to claim 18, wherein when the intermediate color in the given color system, which is obtained by mixing the plurality of basic colors constituting a color image, is to be estimated, a plurality of color patches are formed by combinations of the plurality of basic colors, and colors defined by combinations excluded from the combinations of the plurality of basic colors are estimated by interpolation by using colors of at least three known color patches.
Claim 30
Dependent Claim
18 words
A method according to claim 19, wherein the basic colors are yellow (Y), magenta (M), and cyan (C).
Claim 31
Dependent Claim
71 words
A method according to claim 15, wherein when a desired value of the color system is not a value which cannot be expressed by the combinations of the plurality of basic colors, the desired value of the color system is compressed in a direction of an achromatic color and is converted to a value of a color system which can be expressed by the combinations of the plurality of basic colors.
Claim 32
Dependent Claim
73 words
A color image correction apparatus wherein when expression ranges of saturation and lightness of an image of an input system are wider than those of an output system, a white level of the output system is lowered than an original white level thereof, each color image data is corrected on the basis of a plurality of input color image data, and corrected data are output as a plurality of corrected color image data.
Claim 33
Dependent Claim
73 words
A color image correction apparatus wherein when expression ranges of saturation and lightness of an image of an input system are wider than those of an output system, a white level of the output system is lowered than an original white level thereof, each color image data is corrected on the basis of a plurality of input color image data, and corrected data are output as a plurality of corrected color image data.
Claim 34
Dependent Claim
22 words
An apparatus according to claim 26, wherein said input system is a printed product, and said output system is color print paper.
Claim 35
Dependent Claim
16 words
An apparatus according to claim 26, wherein said output system is used as a color CRT.
References Cited (Backward Citations)
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