JPS5416918A - Background density compensating circuit - Google Patents

Background density compensating circuit

Info

Publication number
JPS5416918A
JPS5416918A JP8163677A JP8163677A JPS5416918A JP S5416918 A JPS5416918 A JP S5416918A JP 8163677 A JP8163677 A JP 8163677A JP 8163677 A JP8163677 A JP 8163677A JP S5416918 A JPS5416918 A JP S5416918A
Authority
JP
Japan
Prior art keywords
background density
compensating circuit
density compensating
fluctuation
threhold
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
JP8163677A
Other languages
Japanese (ja)
Other versions
JPS5927499B2 (en
Inventor
Hiroshi Mitsuda
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
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP52081636A priority Critical patent/JPS5927499B2/en
Publication of JPS5416918A publication Critical patent/JPS5416918A/en
Publication of JPS5927499B2 publication Critical patent/JPS5927499B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE: To eliminate the fluctuation of the threhold level at the inter-line part of the manuscript by controlling the time constant of the white/black peak level detector circuit, and thus to secure the following to the fluctuation of the background density and contrast.
COPYRIGHT: (C)1979,JPO&Japio
JP52081636A 1977-07-07 1977-07-07 Background density compensation circuit Expired JPS5927499B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52081636A JPS5927499B2 (en) 1977-07-07 1977-07-07 Background density compensation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52081636A JPS5927499B2 (en) 1977-07-07 1977-07-07 Background density compensation circuit

Publications (2)

Publication Number Publication Date
JPS5416918A true JPS5416918A (en) 1979-02-07
JPS5927499B2 JPS5927499B2 (en) 1984-07-06

Family

ID=13751813

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52081636A Expired JPS5927499B2 (en) 1977-07-07 1977-07-07 Background density compensation circuit

Country Status (1)

Country Link
JP (1) JPS5927499B2 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56140269U (en) * 1980-03-19 1981-10-23
JPS57129967U (en) * 1981-02-09 1982-08-13
JPS57170669A (en) * 1981-03-27 1982-10-20 Hell Rudolf Dr Ing Gmbh Circuit device for converting analog image signal to 2-level signal
JPS57208768A (en) * 1981-06-19 1982-12-21 Hitachi Ltd Digitizing system for video signal
JPS5853269A (en) * 1981-09-24 1983-03-29 Ricoh Co Ltd Texture eliminating circuit
JPS5894273A (en) * 1981-11-30 1983-06-04 Nec Corp Contrast correcting circuit
JPS6047567A (en) * 1983-08-26 1985-03-14 Matsushita Graphic Commun Syst Inc Binary coding device for picture signal
JPS6341975U (en) * 1986-09-04 1988-03-19

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56140269U (en) * 1980-03-19 1981-10-23
JPS57129967U (en) * 1981-02-09 1982-08-13
JPS57170669A (en) * 1981-03-27 1982-10-20 Hell Rudolf Dr Ing Gmbh Circuit device for converting analog image signal to 2-level signal
JPS57208768A (en) * 1981-06-19 1982-12-21 Hitachi Ltd Digitizing system for video signal
JPS6335149B2 (en) * 1981-06-19 1988-07-13 Hitachi Ltd
JPS5853269A (en) * 1981-09-24 1983-03-29 Ricoh Co Ltd Texture eliminating circuit
JPH0328110B2 (en) * 1981-09-24 1991-04-18 Ricoh Kk
JPS5894273A (en) * 1981-11-30 1983-06-04 Nec Corp Contrast correcting circuit
JPS63988B2 (en) * 1981-11-30 1988-01-09 Nippon Electric Co
JPS6047567A (en) * 1983-08-26 1985-03-14 Matsushita Graphic Commun Syst Inc Binary coding device for picture signal
JPS6341975U (en) * 1986-09-04 1988-03-19
JPH0543564Y2 (en) * 1986-09-04 1993-11-02

Also Published As

Publication number Publication date
JPS5927499B2 (en) 1984-07-06

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