Patent US4891692A successfully refreshed from Google Patents.
US4891692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color image reading apparatus having variable exposure control
Assignee: Canon Inc
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Filing: 1987-11-06
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Granted: 1990-01-02
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Expires: 2007-11-06
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 to read an image recorded on the color film by photoelectrically converting the transmission light from the exposed color film; a detector to detect a density of the image on the basis of an output from the reading unit; and a controller 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
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:09
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40056; H04N1/407; H04N1/4072; H04N1/4074
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
74 words
An image reading apparatus comprising: exposing means for exposing an original image; reading means for reading an image by photoelectrically converting a light from the exposed original image; detecting means for detecting a density of said image on the basis of a histogram 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
74 words
An image reading apparatus comprising: exposing means for exposing an original image; reading means for reading an image by photoelectrically converting a light from the exposed original image; detecting means for detecting a density of said image on the basis of a histogram 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
39 words
An apparatus according to claim 1, wherein the original image includes a color film image, and said reading means reads the image recorded on a a color film by photoelectrically converting a transmission light from the exposed color film.
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 original image.
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
81 words
A color image reading apparatus comprising: process means including exposing means for exposing a color film, and 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 said process means in accordance with the base density and the image density which were detected by said detecting means.
Claim 8
Dependent Claim
81 words
A color image reading apparatus comprising: process means including exposing means for exposing a color film, and 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 said process means 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
17 words
An apparatus according to claim 1, wherein said reading means reads the original image line by line.
Claim 13
Dependent Claim
35 words
An apparatus according to claim 10, wherein said detecting means detects the image density on the basis of the output from said reading means, said output corresponding to a predetermined portion of the original image.
Claim 14
Dependent Claim
37 words
An apparatus according to claim 11, wherein said detecting means detects the image density on the basis of the output from said reading means which output corresponds to a predetermined number of lines of the original image.
Claim 15
Dependent Claim
30 words
An apparatus according to claim 1, wherein said detecting means detects the image density by obtaining a reference white level from the histogram of the output from said reading means.
Claim 16
Dependent Claim
36 words
An apparatus according to claim 1, wherein said detecting means detects the image density when a predetermined relationship is established among a plurality of signals which together constitute a color image signal from said reading means.
Claim 17
Dependent Claim
30 words
An apparatus according to claim 9, wherein said detecting means detects the image density by obtaining a reference white level from the histogram of an output of said reading means.
Claim 18
Dependent Claim
21 words
An apparatus according to claim 6, wherein said reading means reads the image recorded on the color film line by line.
Claim 19
Dependent Claim
41 words
An apparatus according to claim 16, wherein said detecting means detects the density of the image on the basis of an output of said reading means which output corresponds to a predetermined portion of the image recorded on the color film.
Claim 20
Dependent Claim
41 words
An apparatus according to claim 17, wherein said detecting means detects the image density on the basis of the output of said reading means which output corresponds to a predetermined number of lines of the image recorded on the color film.
Claim 21
Dependent Claim
30 words
An apparatus according to claim 7, wherein said detecting means detects the image density on the basis of the output of said reading means in accordance with a predetermined condition.
Claim 22
Dependent Claim
31 words
An apparatus according to claim 7, 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 23
Dependent Claim
36 words
An apparatus according to claim 7, wherein said detecting means detects the image density when a predetermined relationship is established among a plurality of signals which together constitute a color image signal from said reading means.
Claim 24
Dependent Claim
101 words
An image reading apparatus comprising: exposure means for exposing an image; read means for reading the image by photoelectrically converting the exposed image line by line; output means for outputting an output of said read means into an image output apparatus; detection means for detecting a density of the image on the basis of the output of said read means, said output corresponding to a predetermined portion in the image; and control means for controlling an exposure light quantity of said exposure means in accordance with the image density detected by said detection means and a base density of the image.
Claim 25
Dependent Claim
101 words
An image reading apparatus comprising: exposure means for exposing an image; read means for reading the image by photoelectrically converting the exposed image line by line; output means for outputting an output of said read means into an image output apparatus; detection means for detecting a density of the image on the basis of the output of said read means, said output corresponding to a predetermined portion in the image; and control means for controlling an exposure light quantity of said exposure means in accordance with the image density detected by said detection means and a base density of the image.
Claim 26
Dependent Claim
39 words
An apparatus according to claim 22, wherein said detection means detects the image density on the basis of a histogram of the output of said read means which output corresponds to a predetermined number of lines of the image.
Claim 27
Dependent Claim
31 words
An apparatus according to claim 22, wherein said detection means detects the image density on the basis of an output of a special color which is output from said read means.
Claim 28
Dependent Claim
15 words
An apparatus according to claim 22, wherein said image output apparatus includes a laser printer.
Claim 29
Dependent Claim
30 words
An apparatus according to claim 22, wherein said detection means detects the image density on the basis of the output of said read means in accordance with a predetermined condition.
Claim 30
Dependent Claim
30 words
An apparatus according to claim 22, wherein said detection means detects the image density by obtaining a reference white level from the histogram of the output of said read means.
Claim 31
Dependent Claim
36 words
An apparatus according to claim 22, wherein said detection means detects the image density when a predetermined relationship is established among a plurality of signals which together constitute a color image signal from said read means.
Claim 32
Dependent Claim
36 words
An apparatus according to claim 22, wherein the image includes a color film image, and said read means reads the image recorded on a color film by photoelectrically converting a transmission light from the exposed image.
Claim 33
Dependent Claim
36 words
An apparatus according to claim 22, wherein said detection means detects the image density on the basis of the output of said read means which output corresponds to a predetermined number of lines on the image.
Claim 34
Dependent Claim
96 words
An image reading apparatus comprising: exposure means for exposing an image; read means for reading the image by photoelectrically converting the exposed image line by line; output means for outputting an output of said read means into an image output apparatus; detection means for detecting a density of the image on the basis of the output of said read means, said output corresponding to a predetermined number of lines on the image; and control means for controlling an exposure light quantity of said exposure means in accordance with the image density detected by said detection means.
Claim 35
Dependent Claim
96 words
An image reading apparatus comprising: exposure means for exposing an image; read means for reading the image by photoelectrically converting the exposed image line by line; output means for outputting an output of said read means into an image output apparatus; detection means for detecting a density of the image on the basis of the output of said read means, said output corresponding to a predetermined number of lines on the image; and control means for controlling an exposure light quantity of said exposure means in accordance with the image density detected by said detection means.
Claim 36
Dependent Claim
39 words
An apparatus according to claim 31, wherein said detection means detects the image density on the basis of a histogram of the output of said read means which output corresponds to a predetermined number of lines of the image.
Claim 37
Dependent Claim
31 words
An apparatus according to claim 31, wherein said detection means detects the image density on the basis of an output of a special color which is output from said read means.
Claim 38
Dependent Claim
39 words
An apparatus according to claim 31, wherein said control means controls the exposure light quantity of said exposure means in accordance with the image density detected by said detection means, and in addition a base density of the image.
Claim 39
Dependent Claim
30 words
An apparatus according to claim 31, wherein said detection means detects the image density on the basis of the output of said read means in accordance with a predetermined condition.
Claim 40
Dependent Claim
30 words
An apparatus according to claim 31, wherein said detection means detects the image density by obtaining a reference white level from the histogram of the output of said read means.
Claim 41
Dependent Claim
36 words
An apparatus according to claim 31, wherein said detection means detects the image density when a predetermined relationship is established among a plurality of signals which together constitute a color image signal from said read means.
Claim 42
Dependent Claim
36 words
An apparatus according to claim 31, wherein the image includes a color film image, and said read means reads the image recorded on a color film by photoelectrically converting a transmission light from the exposed image.
Claim 43
Dependent Claim
15 words
An apparatus according to claim 31, wherein said image output apparatus includes a laser printer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |