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US4947267A
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Image reading apparatus
Assignee: Canon Inc
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Filing: 1989-04-04
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Granted: 1990-08-07
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Expires: 2009-04-04
Abstract
Abstract An image reading apparatus has a CCD sensor for scanning an original image and outputting an analog image signal, an A/D converter for converting the analog image signal output from the CCD sensor into multi-value data consisting of a plurality of bits in units of pixels, and a selector for changing the number of bits of the multi-value data output from the A/D converter.
Inventors
- 👤 Hisaji Masaki
- 👤 Hideo Takaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:55
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/00127; H04N1/40; H04N1/00204; H04N1/04; H04N1/10; H04N1/1013; H04N2201/00; H04N2201/0008; H04N2201/0013; H04N2201/0065; H04N2201/0068; H04N2201/0077; H04N2201/0082
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
An image reading apparatus comprising: reading means for scanning an original image and outputting an analog image signal; converting means for converting the analog image signal output from said reading means into multi-value data consisting of a plurality of bits in units of pixels; changing means for changing the number of bits of the multi-value data output from said converting means; and packing means for linking the multi-value data sequentially output from said changing means and packing such data into a predetermined number of bits of data.
Claim 2
Dependent Claim
87 words
An image reading apparatus comprising: reading means for scanning an original image and outputting an analog image signal; converting means for converting the analog image signal output from said reading means into multi-value data consisting of a plurality of bits in units of pixels; changing means for changing the number of bits of the multi-value data output from said converting means; and packing means for linking the multi-value data sequentially output from said changing means and packing such data into a predetermined number of bits of data.
Claim 3
Dependent Claim
27 words
An apparatus according to claim 1, wherein said changing means comprises selecting means for selecting n (N>n) bits of N-bit multi-value data output from said converting means.
Claim 4
Dependent Claim
18 words
An apparatus according to claim 2, wherein the number of bits selected by said selecting means is variable.
Claim 5
Dependent Claim
22 words
An apparatus according to claim 1, wherein the packing means outputs in parallel the packed data having the predetermined number of bits.
Claim 6
Dependent Claim
93 words
An image reading apparatus comprising: reading means for scanning an original image and outputting an analog image signal; first converting means for converting the analog image signal output from said reading means into multi-value data consisting of a plurality of bits in units of pixels; second converting means for converting the multi-value data generated by said converting means into binary data in units of pixels; and linking means for linking the multi-value data output from said first converting means and the binary data output from said second converting means in units of pixels.
Claim 7
Dependent Claim
93 words
An image reading apparatus comprising: reading means for scanning an original image and outputting an analog image signal; first converting means for converting the analog image signal output from said reading means into multi-value data consisting of a plurality of bits in units of pixels; second converting means for converting the multi-value data generated by said converting means into binary data in units of pixels; and linking means for linking the multi-value data output from said first converting means and the binary data output from said second converting means in units of pixels.
Claim 8
Dependent Claim
32 words
An apparatus according to claim 5, wherein said second converting means comprises forming means for forming the binary data by comparing the multi-value data from said first converting means with threshold data.
Claim 9
Dependent Claim
27 words
An apparatus according to claim 5, wherein said second converting means converts the multi-value data from said first converting means into the binary data by different methods
Claim 10
Dependent Claim
21 words
An apparatus according to claim 5, wherein said linking means outputs in parallel the linked data having a plurality of bits.
References Cited (Backward Citations)
US4578718A
Cited
US4698688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |