JPS6419865A - Image reading device - Google Patents
Image reading deviceInfo
- Publication number
- JPS6419865A JPS6419865A JP62176779A JP17677987A JPS6419865A JP S6419865 A JPS6419865 A JP S6419865A JP 62176779 A JP62176779 A JP 62176779A JP 17677987 A JP17677987 A JP 17677987A JP S6419865 A JPS6419865 A JP S6419865A
- Authority
- JP
- Japan
- Prior art keywords
- reading
- wave shape
- roller
- read
- original
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Facsimile Scanning Arrangements (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
PURPOSE:To shorten a processing time by obtaining a correcting wave shape to be the reference of the shading correction for an original reading output, from an output wave shape to read the surface of a reading roller to carry an original and a reading wave shape of a reading starting edge. CONSTITUTION:The output ratio 1:r of a reference board 32 and a roller 39 of respective picture elements when the white reference board 32 and the reading roller 39 are read under the same condition is set in advance as a constant. A sensor unit 33 moves to a B position, and a sensor 34 reads the roller 39 before an original head edge achieves a writing position. When this wave shape is multiplied by the 1/r, that is coincident with a wave shape to read the reference board 32. The reading output wave shape of the roller 39 is stored as a shading wave shape and from a time point when the original head edge achieves the reading position, the image of the interval until a termination passes through the reading position is read. After the reading of one page is ended, the roller 39 is read while the next page achieves the reading position and the shading wave shape can be updated every page. Thus, the updated result can follow the elapsed change of the brightness of a light source 36.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62176779A JPS6419865A (en) | 1987-07-14 | 1987-07-14 | Image reading device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62176779A JPS6419865A (en) | 1987-07-14 | 1987-07-14 | Image reading device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6419865A true JPS6419865A (en) | 1989-01-23 |
Family
ID=16019691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62176779A Pending JPS6419865A (en) | 1987-07-14 | 1987-07-14 | Image reading device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6419865A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002165074A (en) * | 2000-11-29 | 2002-06-07 | Ricoh Co Ltd | Image reader |
WO2006046381A1 (en) * | 2004-10-29 | 2006-05-04 | Seiko Instruments Inc. | Document reading method, document reader, image forming device, and image scanner |
-
1987
- 1987-07-14 JP JP62176779A patent/JPS6419865A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002165074A (en) * | 2000-11-29 | 2002-06-07 | Ricoh Co Ltd | Image reader |
WO2006046381A1 (en) * | 2004-10-29 | 2006-05-04 | Seiko Instruments Inc. | Document reading method, document reader, image forming device, and image scanner |
JP2006129296A (en) * | 2004-10-29 | 2006-05-18 | Seiko Instruments Inc | Original reading method, original reading apparatus, image forming apparatus, and image scanner |
US8054510B2 (en) | 2004-10-29 | 2011-11-08 | Seiko I Infotech Inc. | Document reading method, document reader, image forming device, and image scanner |
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