DE3445723A1 - Einrichtung zum ausgleichen von schattierungen - Google Patents

Einrichtung zum ausgleichen von schattierungen

Info

Publication number
DE3445723A1
DE3445723A1 DE19843445723 DE3445723A DE3445723A1 DE 3445723 A1 DE3445723 A1 DE 3445723A1 DE 19843445723 DE19843445723 DE 19843445723 DE 3445723 A DE3445723 A DE 3445723A DE 3445723 A1 DE3445723 A1 DE 3445723A1
Authority
DE
Germany
Prior art keywords
shading
digital
divider
compensating
operational amplifier
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
DE19843445723
Other languages
German (de)
English (en)
Other versions
DE3445723C2 (enrdf_load_stackoverflow
Inventor
Shingo Atsugi Kanagawa Yamaguchi
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Publication of DE3445723A1 publication Critical patent/DE3445723A1/de
Application granted granted Critical
Publication of DE3445723C2 publication Critical patent/DE3445723C2/de
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
    • H04N1/40—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)
  • Facsimile Image Signal Circuits (AREA)
  • Facsimile Scanning Arrangements (AREA)
DE19843445723 1983-12-14 1984-12-14 Einrichtung zum ausgleichen von schattierungen Granted DE3445723A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58234296A JPS60126969A (ja) 1983-12-14 1983-12-14 シェ−ディング補正装置

Publications (2)

Publication Number Publication Date
DE3445723A1 true DE3445723A1 (de) 1985-11-07
DE3445723C2 DE3445723C2 (enrdf_load_stackoverflow) 1988-06-01

Family

ID=16968764

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19843445723 Granted DE3445723A1 (de) 1983-12-14 1984-12-14 Einrichtung zum ausgleichen von schattierungen

Country Status (2)

Country Link
JP (1) JPS60126969A (enrdf_load_stackoverflow)
DE (1) DE3445723A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3521076A1 (de) * 1984-06-12 1986-02-13 Ricoh Co., Ltd., Tokio/Tokyo Bildleseeinrichtung fuer ein faksimilegeraet

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62189869A (ja) * 1986-02-17 1987-08-19 Murata Mach Ltd フアクシミリにおけるシエ−デイング補正装置
JPH0226858U (enrdf_load_stackoverflow) * 1988-08-06 1990-02-21
JPH0412756U (enrdf_load_stackoverflow) * 1990-05-22 1992-01-31

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187323A (en) * 1961-10-24 1965-06-01 North American Aviation Inc Automatic scaler for analog-to-digital converter
US3800079A (en) * 1972-12-18 1974-03-26 Ibm Compensation for a scanning system
JPS5579567A (en) * 1978-12-12 1980-06-16 Ricoh Co Ltd Shading correction system
DE3229586A1 (de) * 1981-08-11 1983-03-03 Konishiroku Photo Industry Co., Ltd., Tokyo Abschattungs-ausgleichvorrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187323A (en) * 1961-10-24 1965-06-01 North American Aviation Inc Automatic scaler for analog-to-digital converter
US3800079A (en) * 1972-12-18 1974-03-26 Ibm Compensation for a scanning system
JPS5579567A (en) * 1978-12-12 1980-06-16 Ricoh Co Ltd Shading correction system
DE3229586A1 (de) * 1981-08-11 1983-03-03 Konishiroku Photo Industry Co., Ltd., Tokyo Abschattungs-ausgleichvorrichtung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
SCHILLING, D., BELOVE, Ch., Electronic Circuits, 2.Aufl., New York 1979, MacGraw-Hill Book Comp., S.706-717 *
STEINBUCH, K., Taschenbuch der Nachrichtenver- arbeitung, Berlin/Göttingen/Heidelberg 1962, Springer-Verlag, S.768-773 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3521076A1 (de) * 1984-06-12 1986-02-13 Ricoh Co., Ltd., Tokio/Tokyo Bildleseeinrichtung fuer ein faksimilegeraet

Also Published As

Publication number Publication date
DE3445723C2 (enrdf_load_stackoverflow) 1988-06-01
JPS60126969A (ja) 1985-07-06

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
D2 Grant after examination
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee