US5361145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color image reading apparatus having correction means to correct for relative variations among image signals
Assignee: Canon Inc
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Filing: 1992-11-09
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Granted: 1994-11-01
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Expires: 2012-11-09
Abstract
Abstract A color image reading apparatus is described which has a blazed diffraction grating that diffracts light from an original document, a CCD that converts the diffracted light into electrical image signals, and a filter circuit that performs a smoothing process or an edge emphasising process on the image signals from CCD.
Inventors
- 👤 Shizuo Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:52
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/58
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
98 words
A color image reading apparatus, comprising: an optical device for diffracting light from a color image and sending out in different directions a plurality of beams of light, each beam representing at least one of a plurality of different colors; a plurality of line sensors for respectively receiving at least one of the plurality of beams of light and for converting received beams into electrical image signals; and correction means for correcting relative variations among the image signals from said plurality of line sensors caused by said optical device for diffracting light, and for outputting corrected image signals.
Claim 2
Dependent Claim
98 words
A color image reading apparatus, comprising: an optical device for diffracting light from a color image and sending out in different directions a plurality of beams of light, each beam representing at least one of a plurality of different colors; a plurality of line sensors for respectively receiving at least one of the plurality of beams of light and for converting received beams into electrical image signals; and correction means for correcting relative variations among the image signals from said plurality of line sensors caused by said optical device for diffracting light, and for outputting corrected image signals.
Claim 3
Dependent Claim
17 words
An apparatus according to claim 1, wherein said optical device comprises a one dimensional blazed diffraction grating.
Claim 4
Dependent Claim
18 words
An apparatus according to claim 1, wherein said plurality of line sensors are arranged on a single substrate.
Claim 5
Dependent Claim
32 words
An apparatus according to claim 1, wherein said correction means comprises filter means for performing a filter process on the image signals from at least one of said plurality of line sensors.
Claim 6
Dependent Claim
21 words
An apparatus according to claim 4, wherein said filter means comprises means for performing a smoothing process on the image signals.
Claim 7
Dependent Claim
22 words
An apparatus according to claim 4, wherein said filter means comprises means for performing an edge emphasizing process on the image signals.
Claim 8
Dependent Claim
26 words
An apparatus according to claim 1, further comprising identifying means for identifying a color of the color image on the basis of the corrected image signals.
Claim 9
Dependent Claim
21 words
An apparatus according to claim 7, wherein said identifying means comprises means for identifying whether the image is achromatic or not.
Claim 10
Dependent Claim
111 words
A color image reading apparatus, comprising: an optical device for diffracting light from a color image and sending out in different directions a plurality of beams of light, each beam representing at least one of a plurality of different colors; a plurality of sensors for respectively receiving at least one of the plurality of beams of light and for converting received beams into electrical image signals; and filter means for performing a filtering process on the image signals from at least one of said plurality of line sensors, to compensate for relative variations among image signals from different line sensors caused by said optical device, and for outputting filtered image signals.
Claim 11
Dependent Claim
111 words
A color image reading apparatus, comprising: an optical device for diffracting light from a color image and sending out in different directions a plurality of beams of light, each beam representing at least one of a plurality of different colors; a plurality of sensors for respectively receiving at least one of the plurality of beams of light and for converting received beams into electrical image signals; and filter means for performing a filtering process on the image signals from at least one of said plurality of line sensors, to compensate for relative variations among image signals from different line sensors caused by said optical device, and for outputting filtered image signals.
Claim 12
Dependent Claim
17 words
An apparatus according to claim 9, wherein said optical device comprises a one dimensional blazed diffraction grating.
Claim 13
Dependent Claim
18 words
An apparatus according to claim 9, wherein said plurality of line sensors are arranged on a single substrate.
Claim 14
Dependent Claim
21 words
An apparatus according to claim 9, wherein said filter means comprises means for performing a smoothing process on the image signals.
Claim 15
Dependent Claim
22 words
An apparatus according to claim 9, wherein said filter means comprises means for performing an edge emphasising process on the image signals.
Claim 16
Dependent Claim
26 words
An apparatus according to claim 9, further comprising identifying means for identifying a color of the color image on the basis of the filtered image signals.
Claim 17
Dependent Claim
21 words
An apparatus according to claim 14, wherein said identifying means comprises means for identifying whether the image is achromatic or not.
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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) | 1997-10-31 | 1998-05-02 | 1998-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-31 | 2002-05-02 | 2002-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-31 | 2006-05-02 | 2006-11-01 | $7700.00 | Window Closed / Lapsed |