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CA2077326A1 - Traitement d'images balayees - Google Patents

Traitement d'images balayees

Info

Publication number
CA2077326A1
CA2077326A1 CA2077326A CA2077326A CA2077326A1 CA 2077326 A1 CA2077326 A1 CA 2077326A1 CA 2077326 A CA2077326 A CA 2077326A CA 2077326 A CA2077326 A CA 2077326A CA 2077326 A1 CA2077326 A1 CA 2077326A1
Authority
CA
Canada
Prior art keywords
document
image processing
scanning
scan image
reading element
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.)
Granted
Application number
CA2077326A
Other languages
English (en)
Other versions
CA2077326C (fr
Inventor
Robert Paul Robideau
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.)
Xerox Corp
Original Assignee
Xerox Corp
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 Xerox Corp filed Critical Xerox Corp
Publication of CA2077326A1 publication Critical patent/CA2077326A1/fr
Application granted granted Critical
Publication of CA2077326C publication Critical patent/CA2077326C/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
    • H04N1/4076—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture
    • H04N1/4078—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture using gradational references, e.g. grey-scale test pattern analysis
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/401—Compensating positionally unequal response of the pick-up or reproducing head

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Image Analysis (AREA)
CA002077326A 1991-10-23 1992-09-01 Traitement d'images balayees Expired - Fee Related CA2077326C (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/782,200 US5282053A (en) 1991-10-23 1991-10-23 Scan image processing
US782200 1991-10-23

Publications (2)

Publication Number Publication Date
CA2077326A1 true CA2077326A1 (fr) 1993-04-24
CA2077326C CA2077326C (fr) 1997-07-15

Family

ID=25125310

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002077326A Expired - Fee Related CA2077326C (fr) 1991-10-23 1992-09-01 Traitement d'images balayees

Country Status (3)

Country Link
US (1) US5282053A (fr)
JP (1) JPH05227426A (fr)
CA (1) CA2077326C (fr)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0592501A1 (fr) * 1991-07-04 1994-04-20 WOYDICH, Horst Porte-original pour la lecture de donnees stockees a plat
JP2925838B2 (ja) * 1992-05-13 1999-07-28 東芝テック株式会社 画像読取装置
JPH0698094A (ja) * 1992-09-14 1994-04-08 Toshiba Corp 画像形成装置
JP2889080B2 (ja) * 1993-04-27 1999-05-10 シャープ株式会社 スキャナ
US5448277A (en) * 1993-06-30 1995-09-05 Xerox Corporation Virtual process controls test pattern for electronic printers
US5404232A (en) * 1993-10-04 1995-04-04 Xerox Corporation Calibration system for a raster input scanner
WO1995011565A1 (fr) * 1993-10-22 1995-04-27 Xerox Corporation Procede et appareil de reglage de la densite d'une image electronique
US5844697A (en) * 1995-06-29 1998-12-01 Agfa Division--Bayer Corporation Combined dust protection and dark calibration slide for a flat-bed scanner
JP3793600B2 (ja) * 1996-02-20 2006-07-05 株式会社オプトエレクトロニクス 光学的パターン読取装置
JPH10173918A (ja) * 1996-12-16 1998-06-26 Alps Electric Co Ltd 画像読取手段のシェーディング補正方法および画像処理装置
TW339494B (en) * 1996-08-12 1998-09-01 Alps Electric Co Ltd Image reader and the shade correction method
US5786902A (en) * 1996-09-17 1998-07-28 Eastman Kodak Company Photographic printer and method of digitally correcting for a photographic printer
US5884118A (en) * 1996-11-26 1999-03-16 Xerox Corporation Printer having print output linked to scanner input for automated image quality adjustment
US6338432B1 (en) * 1997-02-19 2002-01-15 Opticon Inc Optical pattern reading apparatus with movable optical unit
US5774761A (en) * 1997-10-14 1998-06-30 Xerox Corporation Machine set up procedure using multivariate modeling and multiobjective optimization
DE19811279C2 (de) * 1998-03-12 2001-12-06 Heidelberger Druckmasch Ag Verfahren zur automatischen Auswahl von Farbkalibrierungen
US6327047B1 (en) * 1999-01-22 2001-12-04 Electronics For Imaging, Inc. Automatic scanner calibration
US6873363B1 (en) * 1999-02-16 2005-03-29 Micron Technology Inc. Technique for flagging oversaturated pixels
US6357658B1 (en) 1999-04-28 2002-03-19 Peripheral Dynamics, Inc. Apparatus and methods for scanning documents including OMR, bar-code, and image data
AU6336100A (en) * 1999-06-22 2001-01-09 Peripheral Dynamics Inc. Apparatus and methods for image scanning of variable sized documents having variable orientations
US6628426B2 (en) 2001-05-22 2003-09-30 Lexmark International, Inc. Method of halftone screen linearization via continuous gradient patches
US7006250B2 (en) * 2001-09-27 2006-02-28 Lexmark International, Inc. Method of setting laser power and developer bias in an electrophotographic machine based on an estimated intermediate belt reflectivity
US7130090B2 (en) * 2001-12-18 2006-10-31 Ncr Corporation Method of operating an image-based document processing system and an apparatus therefor
DE102007038754A1 (de) * 2007-08-16 2009-02-19 Giesecke & Devrient Gmbh Vorrichtung für die Kalibrierung von Sensoren

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5650668A (en) * 1979-09-29 1981-05-07 Sharp Corp Correcting system for reading output
JPS5927675A (ja) * 1982-08-04 1984-02-14 Toshiba Corp シエ−デイング補正方式
JPS60169969U (ja) * 1984-04-18 1985-11-11 株式会社東芝 画像読取り装置
JPS6153868A (ja) * 1984-08-24 1986-03-17 Dainippon Screen Mfg Co Ltd 画像走査信号処理におけるキャリブレーション装置
JPS62293384A (ja) * 1986-06-11 1987-12-19 Toshiba Corp 画像入力装置
US4974098A (en) * 1987-08-26 1990-11-27 Fuji Photo Film Co., Ltd. Original table for reading images

Also Published As

Publication number Publication date
JPH05227426A (ja) 1993-09-03
US5282053A (en) 1994-01-25
CA2077326C (fr) 1997-07-15

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Legal Events

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