US5049985A
Expired / Lapsed
US
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Color images reading apparatus having transformation table formed base on average values of plural color component signals
Assignee: Canon Inc
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Filing: 1989-10-11
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Granted: 1991-09-17
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Expires: 2009-10-11
Abstract
Abstract A color image reading apparatus has a reading unit for color-separating and reading a color image, an operating unit for obtaining an average value of each of a plurality of color-component signals output from the reading unit, and a transforming unit for transforming the plurality of color-component signals from the reading unit into a plurality of color-density signals on the basis of the average values of the plurality of color-component signals obtained by the operating unit.
Inventors
- 👤 Ken-Ichi Outa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:18
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/222; H04N5/253; G; G03; G03B; G03B27/00; G03B27/72; G03B27/73; G03B27/735; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/603; H04N23/00; H04N23/80; H04N23/84; H04N23/88
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
96 words
A color image reading apparatus comprising: reading means for color-separating and reading a color image; operating means for obtaining an average value of each of a plurality of color-component signals output from said reading means; and transforming means for transforming the plurality of color-component signals from said reading means into a plurality of color density signals, wherein said transforming means performs transformation such that average values of the plurality of color-density signals become substantially equal to each other on the basis of the average values of the plurality of color-component signals obtained by said operating means.
Claim 2
Dependent Claim
96 words
A color image reading apparatus comprising: reading means for color-separating and reading a color image; operating means for obtaining an average value of each of a plurality of color-component signals output from said reading means; and transforming means for transforming the plurality of color-component signals from said reading means into a plurality of color density signals, wherein said transforming means performs transformation such that average values of the plurality of color-density signals become substantially equal to each other on the basis of the average values of the plurality of color-component signals obtained by said operating means.
Claim 3
Dependent Claim
31 words
An apparatus according to claim 1, wherein said transforming means performs transformation by using a transformation table formed on the basis of the average values of the plurality of color-component signals.
Claim 4
Dependent Claim
20 words
An apparatus according to claim 1, wherein said reading means reads a color image recorded on a color negative film.
Claim 5
Dependent Claim
28 words
An apparatus according to claim 2, further comprising forming means for forming the transformation table on the basis of the average values of the plurality of color-component signals.
Claim 6
Dependent Claim
25 words
An apparatus according to claim 3, wherein said transforming means performs transformation in consideration of a density of a base of the color negative film.
Claim 7
Dependent Claim
109 words
A color image reading apparatus comprising: reading means for color-separating and reading light transmitted through a color negative film; operating means for obtaining an average value of each of a plurality of color-component signals output by reading an image portion of the color negative film by said reading means; and transforming means for transforming the plurality of color-component signals from said reading means into a plurality of color-density signals, wherein said transforming means performs transformation such that average values of the plurality of color-density signals become substantially equal to each other on the basis of the average values of the plurality of color-component signals obtained by said operating means.
Claim 8
Dependent Claim
109 words
A color image reading apparatus comprising: reading means for color-separating and reading light transmitted through a color negative film; operating means for obtaining an average value of each of a plurality of color-component signals output by reading an image portion of the color negative film by said reading means; and transforming means for transforming the plurality of color-component signals from said reading means into a plurality of color-density signals, wherein said transforming means performs transformation such that average values of the plurality of color-density signals become substantially equal to each other on the basis of the average values of the plurality of color-component signals obtained by said operating means.
Claim 9
Dependent Claim
31 words
An apparatus according to claim 6, wherein said transforming means performs transformation by using a transformation table formed on the basis of the average values of the plurality of color-component signals.
Claim 10
Dependent Claim
23 words
An apparatus according to claim 6, wherein said transforming means transforms the plurality of color-component signals into a plurality of reflection density signals.
Claim 11
Dependent Claim
22 words
An apparatus according to claim 6, wherein said transforming means transforms the plurality of color-component signals into a plurality of luminance signals.
Claim 12
Dependent Claim
28 words
An apparatus according to claim 7, further comprising forming means for forming the transformation table on the basis of the average values of the plurality of color-component signals.
Claim 13
Dependent Claim
25 words
An apparatus according to claim 6, wherein said transforming means performs transformation in consideration of a density of a base of the color negative film.
Claim 14
Dependent Claim
140 words
A color image reading apparatus comprising: reading means for color-separating and reading light transmitted through a color negative film; operating means for obtaining an average image density from an average value of each of a plurality of color-component signals output by reading an image portion of the color negative film by said reading means; detecting means for detecting a base density of a base portion of the color negative film from the plurality of color-component signals output by reading the base portion by said reading means; transforming means for transforming the plurality of color-component signals from said reading means into a plurality of color-density signals by using a transformation table; and forming means for forming the transformation table on the basis of the average image density obtained by said operating means and the base density detected by said detecting means.
Claim 15
Dependent Claim
140 words
A color image reading apparatus comprising: reading means for color-separating and reading light transmitted through a color negative film; operating means for obtaining an average image density from an average value of each of a plurality of color-component signals output by reading an image portion of the color negative film by said reading means; detecting means for detecting a base density of a base portion of the color negative film from the plurality of color-component signals output by reading the base portion by said reading means; transforming means for transforming the plurality of color-component signals from said reading means into a plurality of color-density signals by using a transformation table; and forming means for forming the transformation table on the basis of the average image density obtained by said operating means and the base density detected by said detecting means.
Claim 16
Dependent Claim
73 words
A color image processing method, comprising the steps of: inputting a plurality of color-component signals representing a color image; obtaining an average value of each of the plurality of color-component signals; and transforming the plurality of color-component signals into a plurality of color-density signals, so that average values of the plurality of color-density signals become substantially equal to each other on the basis of the average values of the plurality of color-component signals.
Claim 17
Dependent Claim
73 words
A color image processing method, comprising the steps of: inputting a plurality of color-component signals representing a color image; obtaining an average value of each of the plurality of color-component signals; and transforming the plurality of color-component signals into a plurality of color-density signals, so that average values of the plurality of color-density signals become substantially equal to each other on the basis of the average values of the plurality of color-component signals.
Claim 18
Dependent Claim
34 words
An method according to claim 13, wherein, in said transforming step, the transformation is carried out using a transformation table formed on the basis of the average values of the plurality of color-component signals.
Claim 19
Dependent Claim
20 words
An method according to claim 13, wherein, in said inputting step, the color image is on a color negative film.
Claim 20
Dependent Claim
28 words
An method according to claim 14, further comprising the step of forming the transformation table on the basis of the average values of the plurality of color-component signals.
Claim 21
Dependent Claim
27 words
An method according to claim 13, wherein, in said transforming step, transformation is performed in consideration of a density of a base of the color negative film.
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USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1994-09-16 | 1995-03-18 | 1995-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-16 | 1999-03-18 | 1999-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-16 | 2003-03-18 | 2003-09-17 | $7700.00 | Window Closed / Lapsed |