GB2232844B - Image reading apparatus - Google Patents

Image reading apparatus

Info

Publication number
GB2232844B
GB2232844B GB9008235A GB9008235A GB2232844B GB 2232844 B GB2232844 B GB 2232844B GB 9008235 A GB9008235 A GB 9008235A GB 9008235 A GB9008235 A GB 9008235A GB 2232844 B GB2232844 B GB 2232844B
Authority
GB
United Kingdom
Prior art keywords
image reading
reading apparatus
image
reading
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
GB9008235A
Other versions
GB2232844A (en
GB9008235D0 (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/en
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of GB9008235D0 publication Critical patent/GB9008235D0/en
Publication of GB2232844A publication Critical patent/GB2232844A/en
Application granted granted Critical
Publication of GB2232844B publication Critical patent/GB2232844B/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
GB9008235A 1989-04-26 1990-04-11 Image reading apparatus Expired - Fee Related GB2232844B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10448289 1989-04-26
JP1185226A JPH0348565A (en) 1989-04-26 1989-07-17 Image reader

Publications (3)

Publication Number Publication Date
GB9008235D0 GB9008235D0 (en) 1990-06-13
GB2232844A GB2232844A (en) 1990-12-19
GB2232844B true GB2232844B (en) 1993-09-15

Family

ID=26444943

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9008235A Expired - Fee Related GB2232844B (en) 1989-04-26 1990-04-11 Image reading apparatus

Country Status (3)

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

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 (en) 2000-10-27 2009-02-12 株式会社リコー Image reading apparatus and copying machine
US7433097B2 (en) * 2003-04-18 2008-10-07 Hewlett-Packard Development Company, L.P. Optical image scanner with moveable calibration target

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0006570A2 (en) * 1978-06-30 1980-01-09 International Business Machines Corporation Document scanning system with exposure control

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2402982A1 (en) * 1977-09-09 1979-04-06 Thomson Csf OPTO-ELECTRONIC DOCUMENT ANALYSIS DEVICE, AND FACSIMILE TRANSMISSION SYSTEM USING SUCH A DEVICE
JPS63316567A (en) * 1987-06-19 1988-12-23 Mitsubishi Electric Corp Color image reader

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0006570A2 (en) * 1978-06-30 1980-01-09 International Business Machines Corporation Document scanning system with exposure control

Also Published As

Publication number Publication date
CA2015426C (en) 1995-01-24
CA2015426A1 (en) 1990-10-26
DE4013404C2 (en) 1992-07-30
GB2232844A (en) 1990-12-19
GB9008235D0 (en) 1990-06-13
DE4013404A1 (en) 1990-11-15

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Legal Events

Date Code Title Description
746 Register noted 'licences of right' (sect. 46/1977)

Effective date: 19960611

PCNP Patent ceased through non-payment of renewal fee

Effective date: 19970411