JPS5664564A - Picture transmission system - Google Patents

Picture transmission system

Info

Publication number
JPS5664564A
JPS5664564A JP14660380A JP14660380A JPS5664564A JP S5664564 A JPS5664564 A JP S5664564A JP 14660380 A JP14660380 A JP 14660380A JP 14660380 A JP14660380 A JP 14660380A JP S5664564 A JPS5664564 A JP S5664564A
Authority
JP
Japan
Prior art keywords
picture
density
pulse
pitch
converting
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
JP14660380A
Other languages
Japanese (ja)
Inventor
Mutsuo Ogawa
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
Priority to JP14660380A priority Critical patent/JPS5664564A/en
Publication of JPS5664564A publication Critical patent/JPS5664564A/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
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4051—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a dispersed dots halftone pattern, the dots having substantially the same size

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Facsimiles In General (AREA)

Abstract

PURPOSE:To realize a transmission of the intermediate gradation density, by converting the picture density into the emerging frequency of the pitch of microdots. CONSTITUTION:The picture signal of the original 13 sent from the scanner 36 is amplified through the amplifier 37 and then applied to the threshold circuit 38. The threshold level switch 39 delivers the voltage having varying threshold level every time when the pulse is supplied from the pluse generator 35. The digital signal obtained by converting the density of picture is converted into the pitch, i.e., the frequency is delivered from the circuit 38. This digital picture signal is applied to the counter 45 along with the pulse sent from the pulse generator 35 to be stored there.
JP14660380A 1980-10-20 1980-10-20 Picture transmission system Pending JPS5664564A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14660380A JPS5664564A (en) 1980-10-20 1980-10-20 Picture transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14660380A JPS5664564A (en) 1980-10-20 1980-10-20 Picture transmission system

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP47056755A Division JPS5751310B2 (en) 1972-06-07 1972-06-07

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP57153291A Division JPS5875377A (en) 1982-09-02 1982-09-02 Picture transmitting system

Publications (1)

Publication Number Publication Date
JPS5664564A true JPS5664564A (en) 1981-06-01

Family

ID=15411455

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14660380A Pending JPS5664564A (en) 1980-10-20 1980-10-20 Picture transmission system

Country Status (1)

Country Link
JP (1) JPS5664564A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848569A (en) * 1981-09-18 1983-03-22 Canon Inc Picture data storage method for color printer
JPS61234070A (en) * 1985-04-10 1986-10-18 Fuji Electric Co Ltd Image sensor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4917918A (en) * 1972-06-07 1974-02-16

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4917918A (en) * 1972-06-07 1974-02-16

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848569A (en) * 1981-09-18 1983-03-22 Canon Inc Picture data storage method for color printer
JPS61234070A (en) * 1985-04-10 1986-10-18 Fuji Electric Co Ltd Image sensor

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