EP0363969A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Color image reading apparatus
Assignee: Canon Inc
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Filing: 1989-10-12
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Granted: —
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Expires: 2009-10-12
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
EP
Data Source
google_patents
Last Synchronized
2026-11-09 11:31
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: 11
Claim 1
Independent Claim
73 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 on the basis of the average values of the plurality of color-component signals obtained by said operating means.
Claim 2
Dependent Claim
73 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 on the basis of the average values of the plurality of color-component signals obtained by said operating means.
Claim 3
Dependent Claim
29 words
An apparatus according to claim 1, wherein said transforming means performs transformation such that the average values of the plurality of color-component signals become substantially equal to each other.
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
85 words
A color image reading apparatus comprising: reading means for color-separating and reading light transmitted through a color negative; 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 color-component signals from said reading means into a plurality of color-density signals on the basis of the average values of the plurality of color-component signals obtained by said operating means.
Claim 6
Dependent Claim
85 words
A color image reading apparatus comprising: reading means for color-separating and reading light transmitted through a color negative; 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 color-component signals from said reading means into a plurality of color-density signals on the basis of the average values of the plurality of color-component signals obtained by said operating means.
Claim 7
Dependent Claim
28 words
An apparatus according to claim 4, wherein said transforming means performs transformation such that the average values of the plurality color-component signals become substantially equal to each other.
Claim 8
Dependent Claim
23 words
An apparatus according to claim 4, wherein said transforming means transforms the plurality of color-component signals into a plurality of reflection density signals.
Claim 9
Dependent Claim
22 words
An apparatus according to claim 4, wherein said transforming means transforms the plurality of color-component signals into a plurality of luminance signals.
Claim 10
Dependent Claim
114 words
A color image reading apparatus comprising: reading means for color-separating and reading light transmitted from 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 by said reading means; detecting means for detecting a non-image-portion density from the plurality of color-component signals output by reading a non-image portion 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 on the basis of the average image density obtained by said operating means and the non-image-portion density detected by said detecting means.
Claim 11
Dependent Claim
114 words
A color image reading apparatus comprising: reading means for color-separating and reading light transmitted from 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 by said reading means; detecting means for detecting a non-image-portion density from the plurality of color-component signals output by reading a non-image portion 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 on the basis of the average image density obtained by said operating means and the non-image-portion density detected by said detecting means.
References Cited (Backward Citations)
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