EP0336403A2
Expired / Lapsed
EP
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Image reading apparatus
Assignee: Canon Inc
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Filing: 1989-04-05
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Granted: —
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Expires: 2009-04-05
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
EP
Data Source
google_patents
Last Synchronized
2026-11-06 10:57
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: 9
Claim 1
Independent Claim
62 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; and changing means for changing the number of bits of the multi-value data output from said converting means.
Claim 2
Dependent Claim
62 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; and changing means for changing the number of bits of the multi-value data output from said converting means.
Claim 3
Dependent Claim
29 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
33 words
An apparatus according to claim 1, further including packing means for packing into data having a predetermined number of bits the multi-value data whose number of bits is changed by said changing means.
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.
References Cited (Backward Citations)
No citation records indexed.
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