US20020154326A1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image processing method and apparatus
Assignee: Canon Inc
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Filing: 2002-04-04
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Granted: —
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Expires: 2022-04-04
Abstract
Abstract When a color reproduction model of a device is generated, colorimetry of a 9×9×9 grid, for example, is performed utilizing equidistant signal values in the color space of the device. Generally, if the number of grid points is increased, the precision with which the color reproduction model is estimated rises but the time needed for measurement is prolonged because the number of colorimetric measurements is also increased. Accordingly, in a printer system comprising a pre-color-processing table for performing color matching and a post-color-processing table for performing color separation, color patches set non-equidistantly in RGB device color space are printed in accordance with changeover of printer CMYKcm signals in the post-color-processing table and the color reproduction model of the printer is generated using data obtained by measuring the colors of the color patches.
Inventors
- 👤 Okinori Tsuchiya
- 👤 Shigeyasu Nagoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:17
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/603; H04N1/6033; G06K2215/00; G06K2215/0082; G06K2215/0094
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
57 words
1 . An image processing method for generating a color reproduction model of a device using a plurality of colorimetric values, comprising the step of measuring the plurality of calorimetric values from color patches produced based upon signal values disposed substantially equidistantly in color signal space of the device and at least one signal value disposed non-equidistantly.
Claim 2
Dependent Claim
57 words
1 . An image processing method for generating a color reproduction model of a device using a plurality of colorimetric values, comprising the step of measuring the plurality of calorimetric values from color patches produced based upon signal values disposed substantially equidistantly in color signal space of the device and at least one signal value disposed non-equidistantly.
Claim 3
Dependent Claim
27 words
2 . The method according to claim 1 , wherein the color reproduction model is utilized in estimating a calorimetric value with regard to any color patch.
Claim 4
Dependent Claim
32 words
3 . The method according to claim 1 , wherein spacing between the signal values is decided in accordance with a combination of a plurality of color components supported by the device.
Claim 5
Dependent Claim
33 words
4 . The method according to claim 3 , wherein the spacing between the signal values is decided so as to include a darkest point, a brightest point and a maximum saturation point.
Claim 6
Dependent Claim
50 words
5 . The method according to claim 3 , wherein the spacing between the signal values is decided in such a manner that the level of a color component of a signal value neighboring a signal value for which the level of the color component is zero will become non-zero.
Claim 7
Dependent Claim
39 words
6 . The method according to claim 3 , wherein the spacing between the signal values is decided in such a manner that combinations of levels of two or more of the color components will have the same level.
Claim 8
Dependent Claim
71 words
7 . A computer program product storing a computer-readable medium comprising computer program code for an image processing method for generating a color reproduction model of a device using a plurality of calorimetric values, comprising process procedure code for measuring the plurality of calorimetric values from color patches produced based upon signal values disposed substantially equidistantly in color signal space of the device and at least one signal value disposed non-equidistantly.
Claim 9
Dependent Claim
71 words
7 . A computer program product storing a computer-readable medium comprising computer program code for an image processing method for generating a color reproduction model of a device using a plurality of calorimetric values, comprising process procedure code for measuring the plurality of calorimetric values from color patches produced based upon signal values disposed substantially equidistantly in color signal space of the device and at least one signal value disposed non-equidistantly.
Claim 10
Dependent Claim
66 words
8 . An image processing apparatus for generating a color reproduction model of a device using a plurality of colorimetric values, comprising: a generator for generating color patches based upon signal values disposed substantially equidistantly in color signal space of the device and at least one signal value disposed non-equidistantly; and a measuring unit for measuring the plurality of calorimetric values from the color patches generated.
Claim 11
Dependent Claim
66 words
8 . An image processing apparatus for generating a color reproduction model of a device using a plurality of colorimetric values, comprising: a generator for generating color patches based upon signal values disposed substantially equidistantly in color signal space of the device and at least one signal value disposed non-equidistantly; and a measuring unit for measuring the plurality of calorimetric values from the color patches generated.
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