CA2015426A1 - Image reading apparatus - Google Patents

Image reading apparatus

Info

Publication number
CA2015426A1
CA2015426A1 CA 2015426 CA2015426A CA2015426A1 CA 2015426 A1 CA2015426 A1 CA 2015426A1 CA 2015426 CA2015426 CA 2015426 CA 2015426 A CA2015426 A CA 2015426A CA 2015426 A1 CA2015426 A1 CA 2015426A1
Authority
CA
Canada
Prior art keywords
image
reading
reference plate
white reference
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.)
Granted
Application number
CA 2015426
Other languages
French (fr)
Other versions
CA2015426C (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 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

Abstract

ABSTRACT OF THE DISCLOSURE

An image reading apparatus in which automatic gain control is performed comprises a integral reading unit, integrated with an optical system having a light source for irradiating an original, a rod lens array for focusing an image, and a line image sensor for reading the image, and a white reference plate, as a reference image upon reading of the image, being attached on one end of reading unit so as to move together therewith. There is effect in that one and the same portion of the white reference plate is read by the line image sensor so that the gain control can be made on the basis of the output of the line image sensor. Further even if a part of the white reference plate becomes dirty, an even output can be obtained throughout the whole surface of the original to thereby make it possible to prevent deterioration, such as generation of transversal stripes, from occurring in the output picture.
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
JPHEI.1-104482 1989-04-26
JP10448289 1989-04-26
JP1185226A JPH0348565A (en) 1989-04-26 1989-07-17 Image reader
JPHEI.1-185226 1989-07-17

Publications (2)

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

Family Cites Families (3)

* 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
US4174528A (en) * 1978-06-30 1979-11-13 International Business Machines Corporation Exposure control for document scanner arrays
JPS63316567A (en) * 1987-06-19 1988-12-23 Mitsubishi Electric Corp Color image reader

Also Published As

Publication number Publication date
DE4013404A1 (en) 1990-11-15
GB2232844A (en) 1990-12-19
GB2232844B (en) 1993-09-15
CA2015426C (en) 1995-01-24
DE4013404C2 (en) 1992-07-30
GB9008235D0 (en) 1990-06-13

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed