JPS57183176A - Picture reader - Google Patents

Picture reader

Info

Publication number
JPS57183176A
JPS57183176A JP56067672A JP6767281A JPS57183176A JP S57183176 A JPS57183176 A JP S57183176A JP 56067672 A JP56067672 A JP 56067672A JP 6767281 A JP6767281 A JP 6767281A JP S57183176 A JPS57183176 A JP S57183176A
Authority
JP
Japan
Prior art keywords
read
kinds
output value
density
values
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
JP56067672A
Other languages
Japanese (ja)
Other versions
JPS6156668B2 (en
Inventor
Toru Kaneko
Masashi Okudaira
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP56067672A priority Critical patent/JPS57183176A/en
Publication of JPS57183176A publication Critical patent/JPS57183176A/en
Publication of JPS6156668B2 publication Critical patent/JPS6156668B2/ja
Granted 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
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Heads (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimile Transmission Control (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To prevent a read signal from deterioration by performing arithmetic processing and compensation by an output value when an original having two kinds of density on the basis of the photoelectric conversion output value of an element is read out, and a reference output value which correspond to said kinds of density. CONSTITUTION:Two kinds of reference densities are read by respective solid photoelectric converting elements in an array, and sent to an amplifying circuit 9. The read signals are converted from analog to digital at a part (10) and then stored in registers 11 and 12 as output values X1 and X2 which correspond to the two kinds of reference density for the respective elements. Then, a read original is read similarly and an obtained signal is stored in a register 13 as an output value X. Those values X1, X2 and X are processed, according to the equation in the figure, by an arithmetic circuit 16 by using normal values S1 and S2 for said two kinds of reference density, thereby calculating a compensated value S.
JP56067672A 1981-05-07 1981-05-07 Picture reader Granted JPS57183176A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56067672A JPS57183176A (en) 1981-05-07 1981-05-07 Picture reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56067672A JPS57183176A (en) 1981-05-07 1981-05-07 Picture reader

Publications (2)

Publication Number Publication Date
JPS57183176A true JPS57183176A (en) 1982-11-11
JPS6156668B2 JPS6156668B2 (en) 1986-12-03

Family

ID=13351716

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56067672A Granted JPS57183176A (en) 1981-05-07 1981-05-07 Picture reader

Country Status (1)

Country Link
JP (1) JPS57183176A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS636958A (en) * 1986-06-26 1988-01-12 Canon Inc Original reader

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS636958A (en) * 1986-06-26 1988-01-12 Canon Inc Original reader

Also Published As

Publication number Publication date
JPS6156668B2 (en) 1986-12-03

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