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JPS6419865A - Image reading device - Google Patents

Image reading device

Info

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
Application number
JP62176779A
Other languages
Japanese (ja)
Inventor
Yukihisa Takeuchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP62176779A priority Critical patent/JPS6419865A/en
Publication of JPS6419865A publication Critical patent/JPS6419865A/en
Pending legal-status Critical Current

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.
JP62176779A 1987-07-14 1987-07-14 Image reading device Pending JPS6419865A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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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