JPS5673974A - Compression system of picture data - Google Patents

Compression system of picture data

Info

Publication number
JPS5673974A
JPS5673974A JP15029479A JP15029479A JPS5673974A JP S5673974 A JPS5673974 A JP S5673974A JP 15029479 A JP15029479 A JP 15029479A JP 15029479 A JP15029479 A JP 15029479A JP S5673974 A JPS5673974 A JP S5673974A
Authority
JP
Japan
Prior art keywords
scanning line
memory
stored
selector
share
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
JP15029479A
Other languages
Japanese (ja)
Other versions
JPS646589B2 (en
Inventor
Masao Konishi
Toshikatsu Kimura
Fumiaki Hirano
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP15029479A priority Critical patent/JPS5673974A/en
Publication of JPS5673974A publication Critical patent/JPS5673974A/en
Publication of JPS646589B2 publication Critical patent/JPS646589B2/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
    • H04N1/41—Bandwidth or redundancy reduction
    • H04N1/411—Bandwidth or redundancy reduction for the transmission or storage or reproduction of two-tone pictures, e.g. black and white pictures
    • H04N1/413—Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information

Abstract

PURPOSE:To prevent the lowering in the processing speed at decoding, by taking the original video element data, if the number of changing points in one row video element data exceeds a given value. CONSTITUTION:A two dimensional video signal is input from a terminal 13 and stored in the memory 14 once. The video information stored in the memory 14 is read out on a shift register 15a one by one scanning line and coded. The iformation of scanning line before one line is stored in the shift register 15b and used as the reference information. When the coding of one scanning is ended and the code is stored for one scanning line's share in the buffer memory 23, the number of changing points on one scanning line and the number fed from the constant memory 30 are compared at a comparison circuit 28, and as a result, the number of changing point on one scanning line is greater than the value set on the memory, then logic ''1'' is output from the comparison circuit 28 and it is fed to a selector 24 via an OR gate 31, and thus, the selector 24 reads out original picture information for one scanning line's share from the memory 14 and it is transmitted from an output terminal 25.
JP15029479A 1979-11-20 1979-11-20 Compression system of picture data Granted JPS5673974A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15029479A JPS5673974A (en) 1979-11-20 1979-11-20 Compression system of picture data

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15029479A JPS5673974A (en) 1979-11-20 1979-11-20 Compression system of picture data

Publications (2)

Publication Number Publication Date
JPS5673974A true JPS5673974A (en) 1981-06-19
JPS646589B2 JPS646589B2 (en) 1989-02-03

Family

ID=15493842

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15029479A Granted JPS5673974A (en) 1979-11-20 1979-11-20 Compression system of picture data

Country Status (1)

Country Link
JP (1) JPS5673974A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6051072A (en) * 1983-08-30 1985-03-22 Canon Inc Picture processing method
JPS6097770A (en) * 1983-11-02 1985-05-31 Canon Inc Picture processor
JPS61252765A (en) * 1985-05-01 1986-11-10 Nec Corp Facsimile signal coding circuit
JPS62259183A (en) * 1986-05-06 1987-11-11 Canon Inc Picture processor
JPS6359464U (en) * 1986-10-08 1988-04-20
FR2642926A1 (en) * 1989-02-09 1990-08-10 Murata Machinery Ltd Reading process and device for a fax machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5015093A (en) * 1973-06-13 1975-02-17
JPS5412515A (en) * 1977-06-29 1979-01-30 Ricoh Co Ltd Data compression system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5015093A (en) * 1973-06-13 1975-02-17
JPS5412515A (en) * 1977-06-29 1979-01-30 Ricoh Co Ltd Data compression system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6051072A (en) * 1983-08-30 1985-03-22 Canon Inc Picture processing method
JPS6097770A (en) * 1983-11-02 1985-05-31 Canon Inc Picture processor
JPS61252765A (en) * 1985-05-01 1986-11-10 Nec Corp Facsimile signal coding circuit
JPS62259183A (en) * 1986-05-06 1987-11-11 Canon Inc Picture processor
JPS6359464U (en) * 1986-10-08 1988-04-20
FR2642926A1 (en) * 1989-02-09 1990-08-10 Murata Machinery Ltd Reading process and device for a fax machine

Also Published As

Publication number Publication date
JPS646589B2 (en) 1989-02-03

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