JPS56154873A - Reading system - Google Patents

Reading system

Info

Publication number
JPS56154873A
JPS56154873A JP5764680A JP5764680A JPS56154873A JP S56154873 A JPS56154873 A JP S56154873A JP 5764680 A JP5764680 A JP 5764680A JP 5764680 A JP5764680 A JP 5764680A JP S56154873 A JPS56154873 A JP S56154873A
Authority
JP
Japan
Prior art keywords
light
original
storage
reading
gain
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
JP5764680A
Other languages
Japanese (ja)
Inventor
Takashi Hagiwara
Kazuhisa Aikawa
Yasunori Kodera
Ichiro Anno
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP5764680A priority Critical patent/JPS56154873A/en
Publication of JPS56154873A publication Critical patent/JPS56154873A/en
Pending 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
    • H04N1/401—Compensating positionally unequal response of the pick-up or reproducing head

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Image Input (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To read an original accurately by reading the quantity of light from a fluorescent lamp by an image sensor before reading the original, by storing said quantity in a storage after converting it in digital, and by making a shading compensation on the basis of the information from the storage in reading the original. CONSTITUTION:Before the start of a read, the quantity of light of fluorescent lamps R1 and R2 reflected at a white part on original OR is obtained by CCD and stored in storage M via gain variable amplifier AMP and A/D converter AD. The gain of AMP at this time is fixed to a prescribed value and then switch SW is closed to negatively feed back the output of storage M to AMP via D/A converter DA and LPF, to control the gain. The amplification factor is increased corresponding to the left and right ends of lamps R1 and R2 where the quantity of light is small and increased corresponding to the center where the quantity of light is large to compensate change of the readout signal uniformly. Thus, disadvantages of a mechanical shading correcting method are eliminated and fluctuations of the quantity of light due to fluctuations of temperature are also compensated.
JP5764680A 1980-04-30 1980-04-30 Reading system Pending JPS56154873A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5764680A JPS56154873A (en) 1980-04-30 1980-04-30 Reading system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5764680A JPS56154873A (en) 1980-04-30 1980-04-30 Reading system

Publications (1)

Publication Number Publication Date
JPS56154873A true JPS56154873A (en) 1981-11-30

Family

ID=13061654

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5764680A Pending JPS56154873A (en) 1980-04-30 1980-04-30 Reading system

Country Status (1)

Country Link
JP (1) JPS56154873A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5980066A (en) * 1982-10-30 1984-05-09 Shimadzu Corp X-ray television device
JPS62252277A (en) * 1986-04-24 1987-11-04 Fujitsu Ltd Image reading system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5980066A (en) * 1982-10-30 1984-05-09 Shimadzu Corp X-ray television device
JPS62252277A (en) * 1986-04-24 1987-11-04 Fujitsu Ltd Image reading system
JPH0685564B2 (en) * 1986-04-24 1994-10-26 富士通株式会社 Image reading method

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