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EP0267793A2
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EP
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Color image reading apparatus
Assignee: Canon Inc
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Filing: 1987-11-12
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Granted: —
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Expires: 2007-11-12
Abstract
Abstract A color image reading apparatus for reading an image of a color negative film having: an exposing unit to expose the color film; a reading unit (101) to read an image recorded on the color film by photoelectrically converting the transmission light from the exposed color film; a detector (106-108, 111-113) to detect a density of the image on the basis of an output from the reading unit; and a controller (111, 114) to control an exposure light quantity of the exposing means in accordance with the image density detected by the detector. The detector detects the image density on the basis of a histogram of the output from the reading unit or on the basis of an output of a special color which is output from the reading unit. With this apparatus, the reading operation suitable for the base density and image density of the color negative film can be performed.
Inventors
- 👤 Kenichi Outa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 15:19
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40056; H04N1/407; H04N1/4072; H04N1/4074
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
78 words
A color image reading apparatus comprising: exposing means for exposing a color film; reading means for reading an image recorded on the color film by photoelectrically converting a transmission light from the exposed color film; detecting means for detecting a density of said image on the basis of an output from said reading means; and control means for controlling an exposure light quantity of said exposing means in accordance with the image density detected by said detecting means.
Claim 2
Dependent Claim
78 words
A color image reading apparatus comprising: exposing means for exposing a color film; reading means for reading an image recorded on the color film by photoelectrically converting a transmission light from the exposed color film; detecting means for detecting a density of said image on the basis of an output from said reading means; and control means for controlling an exposure light quantity of said exposing means in accordance with the image density detected by said detecting means.
Claim 3
Dependent Claim
27 words
An apparatus according to claim 1, wherein said detecting means detects the image density on the basis of a histogram of the output from said reading means.
Claim 4
Dependent Claim
31 words
An apparatus according to claim 1, wherein said detecting means detects the image density on the basis of an output of a special color which is output from said reading means.
Claim 5
Dependent Claim
40 words
An apparatus according to claim 1, wherein said control means controls the exposure light quantity of said exposing means in accordance with the image density detected by said detecting means, and in addition a base density of the color film.
Claim 6
Dependent Claim
30 words
An apparatus according to claim 1, wherein said detecting means detects the image density on the basis of the output of said reading means in accordance with a special condition.
Claim 7
Dependent Claim
78 words
A color image reading apparatus comprising: exposing means for exposing a color film; reading means for reading an image recorded on the color film by photoelectrically converting a transmission light from the exposed color film; detecting means for detecting a base density of the color film and a density of said image; and control means for controlling an image reading operation in accordance with the base density and the image density which were detected by said detecting means.
Claim 8
Dependent Claim
78 words
A color image reading apparatus comprising: exposing means for exposing a color film; reading means for reading an image recorded on the color film by photoelectrically converting a transmission light from the exposed color film; detecting means for detecting a base density of the color film and a density of said image; and control means for controlling an image reading operation in accordance with the base density and the image density which were detected by said detecting means.
Claim 9
Dependent Claim
28 words
An apparatus according to claim 6, wherein said detecting means detects the base density and the image density on the basis of an output of said reading means.
Claim 10
Dependent Claim
19 words
An apparatus according to claim 6, wherein said control means controls an exposure light quantity of said exposing means.
Claim 11
Dependent Claim
27 words
An apparatus according to claim 6, wherein said detecting means detects the image density on the basis of a histogram of an output of said reading means.
Claim 12
Dependent Claim
48 words
A colour image reading apparatus comprising means for projecting an image of a colour film onto a reading means, means for detecting from the reading means the density of the projected image and means for adjusting the density of the projected image on the basis of the detection.
Claim 13
Dependent Claim
48 words
A colour image reading apparatus comprising means for projecting an image of a colour film onto a reading means, means for detecting from the reading means the density of the projected image and means for adjusting the density of the projected image on the basis of the detection.
References Cited (Backward Citations)
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