EP0744860A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Image reading apparatus and image recording apparatus
Assignee: Canon Inc
•
Filing: 1996-05-23
•
Granted: —
•
Expires: 2016-05-23
Abstract
Abstract An image reading apparatus includes a line sensor for reading an image of a document sheet, an A/D converter for converting image data from the line sensor to multi-level image data, a binarization comparator for converting the multi-level image data from the A/D converter to bi-level image data and an image processing IC for selectively outputting the multi-level image data from the A/D converter and the bi-level image data from the binarization comparator. The number of read pixels in the multi-level image data output mode is set to be smaller than the number of read pixels in the bi-level image data output mode.
Inventors
- 👤 Kiyoshi Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:15
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40056
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
102 words
An image reading apparatus comprising: a line sensor for reading an image of a document sheet, first conversion means for converting image data from said line sensor to multi-level image data; second conversion means for converting the multi-level image data from said first conversion means to bi-level image data; and output means for selectively outputting the multi-level image data from said first conversion means and the bi-level image data from said second conversion means; wherein the number of read pixels in the multi-level image data output mode is smaller than the number of read pixels in the bi-level image data output mode.
Claim 2
Dependent Claim
27 words
An image recording apparatus according to Claim 1 further comprising: memory means for storing the bi-level image data and the multi-level image data from said output means.
Claim 3
Dependent Claim
34 words
An image reading apparatus according to Claim 1 wherein the numbers of pixels of said line sensor used in the bi-level image data output mode and the multi-level image data output mode are different.
Claim 4
Dependent Claim
32 words
An image reading apparatus according to Claim 1 further comprising: first drive means for moving an image read position of said line sensor; and second drive means for moving the document sheet.
Claim 5
Dependent Claim
118 words
An image reading apparatus comprising: a line sensor for reading an image of a document sheet; first conversion means for converting image data from said line sensor to multi-level image data; second conversion means for converting the multi-level image data from said first conversion means to bi-level image data; and output means for selectively outputting the multi-level image data from said first conversion means and the bi-level image data from said second conversion means; wherein in the multi-level image data output mode, the number of read pixels is smaller than the number of read pixels in the bi-level image data output mode and pixels located at a center of said line sensor are used for reading the image.
Claim 6
Dependent Claim
27 words
An image reading apparatus according to Claim 5 further comprising: memory means for storing the bi-level image data and the multi-level image data from said output means.
Claim 7
Dependent Claim
34 words
An image reading apparatus according to Claim 5 wherein the numbers of pixels of said line sensor used in the bi-level image data output mode and the multi-level image data output mode are different.
Claim 8
Dependent Claim
32 words
An image reading apparatus according to Claim 5 further comprising: first drive means for moving an image read position of said line sensor; and second drive means for moving the document sheet.
Claim 9
Dependent Claim
121 words
An image recording apparatus comprising: feed means for feeding a record sheet; a carriage for mounting thereon a recording head for recording an image on the record sheet; and drive means for moving said carriage relative to the record sheet; wherein a read unit for reading an image is removably mounted on said carriage in place of said recording head and said carriage having said read unit mounted thereon is moved relative to a document sheet fed by said feed means to read an image of the document sheet, and the number of read pixels in the multi-level image data output mode of the document sheet image is smaller than the number of pixels in the bi-level image data output mode.
Claim 10
Dependent Claim
26 words
An image recording apparatus according to Claim 9 further comprising: memory means for storing the multi-level image data and the bi-level image data to be outputted.
Claim 11
Dependent Claim
37 words
An image recording apparatus according to Claim 10 wherein when said recording head is mounted on said carriage to record an image on the record sheet, said memory means stores the image data for the image recording.
References Cited (Backward Citations)
US4525748A
Cited
GB2169168A
Cited
EP0336403A2
Cited
EP0497440A2
Cited
EP0585028A1
Cited
EP0641115A1
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.