CA2015426C - Image reading apparatus - Google Patents

Image reading apparatus

Info

Publication number
CA2015426C
CA2015426C CA 2015426 CA2015426A CA2015426C CA 2015426 C CA2015426 C CA 2015426C CA 2015426 CA2015426 CA 2015426 CA 2015426 A CA2015426 A CA 2015426A CA 2015426 C CA2015426 C CA 2015426C
Authority
CA
Canada
Prior art keywords
reading
reference plate
white reference
image
image sensor
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.)
Expired - Fee Related
Application number
CA 2015426
Other languages
English (en)
French (fr)
Other versions
CA2015426A1 (en
Inventor
Noriko Tanaka
Yoshihiro Nagata
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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
Priority claimed from JP1185226A external-priority patent/JPH0348565A/ja
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of CA2015426A1 publication Critical patent/CA2015426A1/en
Application granted granted Critical
Publication of CA2015426C publication Critical patent/CA2015426C/en
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
    • H04N1/46—Colour picture communication systems
    • H04N1/48—Picture signal generators
    • H04N1/486—Picture signal generators with separate detectors, each detector being used for one specific colour component
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
CA 2015426 1989-04-26 1990-04-25 Image reading apparatus Expired - Fee Related CA2015426C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP10448289 1989-04-26
JPHEI.1-104482 1989-04-26
JPHEI.1-185226 1989-07-17
JP1185226A JPH0348565A (ja) 1989-04-26 1989-07-17 画像読取装置

Publications (2)

Publication Number Publication Date
CA2015426A1 CA2015426A1 (en) 1990-10-26
CA2015426C true CA2015426C (en) 1995-01-24

Family

ID=26444943

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2015426 Expired - Fee Related CA2015426C (en) 1989-04-26 1990-04-25 Image reading apparatus

Country Status (3)

Country Link
CA (1) CA2015426C (de)
DE (1) DE4013404A1 (de)
GB (1) GB2232844B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5329378A (en) * 1992-11-18 1994-07-12 Samsung Electronics Co., Ltd. Facsimile device with a white level controller
JP4224198B2 (ja) 2000-10-27 2009-02-12 株式会社リコー 画像読取装置および複写機
US7433097B2 (en) * 2003-04-18 2008-10-07 Hewlett-Packard Development Company, L.P. Optical image scanner with moveable calibration target

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2402982A1 (fr) * 1977-09-09 1979-04-06 Thomson Csf Dispositif d'analyse opto-electronique de document, et systeme de transmission par fac-simile utilisant un tel dispositif
US4174528A (en) * 1978-06-30 1979-11-13 International Business Machines Corporation Exposure control for document scanner arrays
JPS63316567A (ja) * 1987-06-19 1988-12-23 Mitsubishi Electric Corp カラ−画像読取装置

Also Published As

Publication number Publication date
DE4013404A1 (de) 1990-11-15
GB2232844B (en) 1993-09-15
DE4013404C2 (de) 1992-07-30
GB2232844A (en) 1990-12-19
GB9008235D0 (en) 1990-06-13
CA2015426A1 (en) 1990-10-26

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Legal Events

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