US5457547A
Expired / Lapsed
US
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Original image reading apparatus
Assignee: Canon Inc
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Filing: 1994-11-17
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Granted: 1995-10-10
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Expires: 2014-11-17
Abstract
Abstract An original image reading apparatus, capable of simultaneously reading a reflective original and a transmissive original, with optimum shading corrections for both, is disclosed. For this purpose there are provided a shading data RAM of a line and a shading correction look-up table for each of the reflective and transmissive originals, and these RAM's and look-up tables are suitably switched according to a selection signal indicating the kind of the original.
Inventors
- 👤 Masanori Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:41
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/00127; H04N1/00249; H04N1/00267; H04N1/00795; H04N1/04; H04N1/10; H04N1/1013; H04N1/203; H04N1/2036; H04N1/2038; H04N1/40; H04N1/401; H04N1/19; H04N1/191; H04N1/192; H04N1/193; H04N2201/00; H04N2201/04; H04N2201/0402; H04N2201/0418
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
132 words
An original reading apparatus comprising: an original support on which an original having a reflecting portion and a light transmissive portion is placed; reading means for optoelectrically performing an original-reading operation to output an image signal by reading a light image reflected from the reflecting and light transmissive portions of the original; first correction means for subjecting the image signal output from said reading means to first shading correction for the reflecting portion of the original; second correction means for subjecting the image signal output from said reading means to second shading correction for the light transmissive portion of the original; and switching means for switching between said first and second correction means, in accordance with area data representing positions of the reflecting portion and the light transmissive portion of the original.
Claim 2
Dependent Claim
132 words
An original reading apparatus comprising: an original support on which an original having a reflecting portion and a light transmissive portion is placed; reading means for optoelectrically performing an original-reading operation to output an image signal by reading a light image reflected from the reflecting and light transmissive portions of the original; first correction means for subjecting the image signal output from said reading means to first shading correction for the reflecting portion of the original; second correction means for subjecting the image signal output from said reading means to second shading correction for the light transmissive portion of the original; and switching means for switching between said first and second correction means, in accordance with area data representing positions of the reflecting portion and the light transmissive portion of the original.
Claim 3
Dependent Claim
32 words
An apparatus according to claim 1, wherein said first and second correction means respectively include memory means for storing shading correction data for either the reflecting portion or the light transmissive portion.
Claim 4
Dependent Claim
31 words
An apparatus according to claim 2, wherein said switching means selects one of the shading correction data for the reflecting portion and the shading correction data for the light transmissive portion.
Claim 5
Dependent Claim
45 words
An apparatus according to claim 2, further comprising writing means for writing the shading correction data for the reflecting portion and the shading correction data for the light transmissive portion into said memory means provided in each of said first and said second correction means.
Claim 6
Dependent Claim
23 words
An apparatus according to claim 1, further comprising detecting means for detecting the positions of the reflecting portion and the light transmissive portion.
Claim 7
Dependent Claim
28 words
An apparatus according to claim 1, further comprising first light source means for exposing the reflecting portion and second light source means for exposing the light transmissive portion.
Claim 8
Dependent Claim
130 words
An original reading apparatus comprising: an original support on which a reflecting original and a light transmissive original are placed together; reading means for optoelectrically performing an original-reading operation to output an image signal by reading a light image from the reflecting original and the light transmissive original which are placed together on said original support; first correction means for subjecting the image signal output from said reading means to first shading correction for the reflecting original; second correction means for subjecting the image signal output from said reading means to second shading correction for the light transmissive original; and switching means for switching between said first and second correction means, according to area data representing positions of the reflecting original and the light transmissive original on said original support.
Claim 9
Dependent Claim
130 words
An original reading apparatus comprising: an original support on which a reflecting original and a light transmissive original are placed together; reading means for optoelectrically performing an original-reading operation to output an image signal by reading a light image from the reflecting original and the light transmissive original which are placed together on said original support; first correction means for subjecting the image signal output from said reading means to first shading correction for the reflecting original; second correction means for subjecting the image signal output from said reading means to second shading correction for the light transmissive original; and switching means for switching between said first and second correction means, according to area data representing positions of the reflecting original and the light transmissive original on said original support.
Claim 10
Dependent Claim
32 words
An apparatus according to claim 7, wherein said first and second correction means respectively include memory means for storing shading correction data for either the reflecting original or the light transmissive original.
Claim 11
Dependent Claim
31 words
An apparatus according to claim 8, wherein said switching means selects one of the shading correction data for the reflecting original and the shading correction data for the light transmissive original.
Claim 12
Dependent Claim
44 words
An apparatus according to claim 8, further comprising writing means for writing the shading correction data for the reflecting original and the shading correction data for the light transmissive original into said memory means provided in each of said first and second correction means.
Claim 13
Dependent Claim
23 words
An apparatus according to claim 7, further comprising detecting means for detecting the positions of the reflecting original and the light transmissive original.
Claim 14
Dependent Claim
28 words
An apparatus according to claim 7, further comprising first light source means for exposing the reflecting original and second light source means for exposing the light transmissive original.
Claim 15
Dependent Claim
124 words
An image reading apparatus comprising: reading means for optoelectrically performing an original-reading operation by reading a light image from an original to output an image signal; leading means for leading a light image reflected from a reflecting original together with a light image passing through a light transmissive original to said reading means; first correction means for subjecting the image signal output from said reading means to first shading correction for the reflecting original; second correction means for subjecting the image signal output from said reading means to second shading correction for the light transmissive original; and switching means for switching between said first and second correction means, in accordance with area data representing positions of the reflecting original and the light transmissive original.
Claim 16
Dependent Claim
124 words
An image reading apparatus comprising: reading means for optoelectrically performing an original-reading operation by reading a light image from an original to output an image signal; leading means for leading a light image reflected from a reflecting original together with a light image passing through a light transmissive original to said reading means; first correction means for subjecting the image signal output from said reading means to first shading correction for the reflecting original; second correction means for subjecting the image signal output from said reading means to second shading correction for the light transmissive original; and switching means for switching between said first and second correction means, in accordance with area data representing positions of the reflecting original and the light transmissive original.
Claim 17
Dependent Claim
32 words
An apparatus according to claim 13, wherein said first and second correction means respectively include memory means for storing shading correction data for either the reflecting original or the light transmissive original.
Claim 18
Dependent Claim
31 words
An apparatus according to claim 14, wherein said switching means selects one of the shading correction data for the reflecting original and the shading correction data for the light transmissive original.
Claim 19
Dependent Claim
44 words
An apparatus according to claim 14, further comprising writing means for writing the shading correction data for the reflecting original and the shading correction data for the light transmissive original into said memory means provided in each of said first and second correction means.
Claim 20
Dependent Claim
23 words
An apparatus according to claim 13, further comprising detecting means for detecting the positions of the reflecting original and the light transmissive original.
Claim 21
Dependent Claim
28 words
An apparatus according to claim 13, further comprising first light source means for exposing the reflecting original and second light source means for exposing the light transmissive original.
Claim 22
Dependent Claim
17 words
An apparatus according to claim 13, further comprising an original support on which an original is placed.
Claim 23
Dependent Claim
21 words
An apparatus according to claim 19, wherein the reflecting original and the light transmissive original are placed on said original support.
Claim 24
Dependent Claim
25 words
An apparatus according to claim 19, further comprising projecting means for projecting the light image passing through the light transmissive original onto said original support.
Claim 25
Dependent Claim
95 words
An image reading method comprising the steps of: leading a light image passing reflected from a reflecting original together with a light image passing through a light transmissive original to a reading portion; performing an original-reading operation by reading the light image led to the reading portion to output an image signal; and subjecting the output image signal to one of a first shading correction for the reflecting original and a second shading correction for the light transmissive original, in accordance with area data representing positions of the reflecting original and the light transmissive original.
Claim 26
Dependent Claim
95 words
An image reading method comprising the steps of: leading a light image passing reflected from a reflecting original together with a light image passing through a light transmissive original to a reading portion; performing an original-reading operation by reading the light image led to the reading portion to output an image signal; and subjecting the output image signal to one of a first shading correction for the reflecting original and a second shading correction for the light transmissive original, in accordance with area data representing positions of the reflecting original and the light transmissive original.
Claim 27
Dependent Claim
37 words
A method according to claim 22, wherein, in said subjecting step, one of the first shading correction and the second shading correction is selected, according to the reading of the reflecting original and the light transmissive original.
Claim 28
Dependent Claim
46 words
A method according to claim 22, wherein, in said subjecting step, the first shading correction and the second shading correction are performed in accordance with a first shading correction data for the reflecting original and a second shading correction data for the light transmissive original, respectively.
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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) | 1998-10-09 | 1999-04-10 | 1999-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-09 | 2003-04-10 | 2003-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-09 | 2007-04-10 | 2007-10-10 | $7700.00 | Window Closed / Lapsed |