JPS5558672A - Digital facsimile unit - Google Patents

Digital facsimile unit

Info

Publication number
JPS5558672A
JPS5558672A JP13219878A JP13219878A JPS5558672A JP S5558672 A JPS5558672 A JP S5558672A JP 13219878 A JP13219878 A JP 13219878A JP 13219878 A JP13219878 A JP 13219878A JP S5558672 A JPS5558672 A JP S5558672A
Authority
JP
Japan
Prior art keywords
gradation signal
signal strings
coder
strings
picture
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
JP13219878A
Other languages
Japanese (ja)
Other versions
JPS6352512B2 (en
Inventor
Tetsuya Takahashi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP13219878A priority Critical patent/JPS5558672A/en
Publication of JPS5558672A publication Critical patent/JPS5558672A/en
Publication of JPS6352512B2 publication Critical patent/JPS6352512B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE: To reproduce a half tone by forming a gradation signal string corresponding to the density of an original in the transmission side and recording a picture with a density corresponding to the reproduced gradation signal string in the receiving side.
CONSTITUTION: A transmission original is scanned, and photoelectric conversion part 1 outputs analogue picture signals E proportional to variable densities of the transmission picture. Signals E are applied to quantizing circuit 2 and are quantized with four threshold levels to form a gradation signal strings corresponding to respective threshold levels. One-scanning components of gradation signal strings A∼D are stored in memory 3, and gradation signal strings are supplied in order from selector 4 to coder 5. After transfer of one-scanning components of gradation signal strings to coder 5, next scanning components of gradation signal strings are transferred in the same order as the proceding scanning line. Coder 5 codes run length of inputted gradation signal strings for every gradation signal string and sends it to modulator 6.
COPYRIGHT: (C)1980,JPO&Japio
JP13219878A 1978-10-27 1978-10-27 Digital facsimile unit Granted JPS5558672A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13219878A JPS5558672A (en) 1978-10-27 1978-10-27 Digital facsimile unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13219878A JPS5558672A (en) 1978-10-27 1978-10-27 Digital facsimile unit

Publications (2)

Publication Number Publication Date
JPS5558672A true JPS5558672A (en) 1980-05-01
JPS6352512B2 JPS6352512B2 (en) 1988-10-19

Family

ID=15075680

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13219878A Granted JPS5558672A (en) 1978-10-27 1978-10-27 Digital facsimile unit

Country Status (1)

Country Link
JP (1) JPS5558672A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5744383A (en) * 1980-08-29 1982-03-12 Matsushita Electric Ind Co Ltd Band-compression system for still picture signal transmission
JPS58197982A (en) * 1982-05-13 1983-11-17 Oki Electric Ind Co Ltd Still picture transmitting system
JPH03192972A (en) * 1989-12-22 1991-08-22 Fuji Xerox Co Ltd Picture reader

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7192873B2 (en) * 2018-10-18 2022-12-20 富士通株式会社 Information processing program, information processing method, and learning device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4958705A (en) * 1972-10-04 1974-06-07

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4958705A (en) * 1972-10-04 1974-06-07

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5744383A (en) * 1980-08-29 1982-03-12 Matsushita Electric Ind Co Ltd Band-compression system for still picture signal transmission
JPS58197982A (en) * 1982-05-13 1983-11-17 Oki Electric Ind Co Ltd Still picture transmitting system
JPH03192972A (en) * 1989-12-22 1991-08-22 Fuji Xerox Co Ltd Picture reader

Also Published As

Publication number Publication date
JPS6352512B2 (en) 1988-10-19

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