JPS57168583A - Data decoder - Google Patents

Data decoder

Info

Publication number
JPS57168583A
JPS57168583A JP5355681A JP5355681A JPS57168583A JP S57168583 A JPS57168583 A JP S57168583A JP 5355681 A JP5355681 A JP 5355681A JP 5355681 A JP5355681 A JP 5355681A JP S57168583 A JPS57168583 A JP S57168583A
Authority
JP
Japan
Prior art keywords
counter
shift register
data
coding
prescanning
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
JP5355681A
Other languages
Japanese (ja)
Inventor
Eiichi Adachi
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 JP5355681A priority Critical patent/JPS57168583A/en
Publication of JPS57168583A publication Critical patent/JPS57168583A/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
    • H04N1/41—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
    • H04N1/417—Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information using predictive or differential encoding
    • H04N1/4175—Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information using predictive or differential encoding involving the encoding of tone transitions with respect to tone transitions in a reference line

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To realize the coding with use of the output signal of an ROM and the output signal of a counter, by providing a prescanning line shift register, a using scanning line shift register, a coding mode ROM and a run length counter. CONSTITUTION:The 2-dimensional coding is carried out for the image information data S31 of the using scanning line by using the image information data S30 of the prescanning line. In this case, a prescanning line shift register 227 that shifts the data S30 by a bit is used along with a present scanning line shift register 227 that shifts the data S31 by a bit, a coding mode ROM221 that uses the output signal of an optional bit of the register 227 for the input, and an RL counter 224 that counts the run length between the changing points of the data S31. In such constitution, the coding is possible with use of the output signals of the ROM221 and the counter 224.
JP5355681A 1981-04-09 1981-04-09 Data decoder Pending JPS57168583A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5355681A JPS57168583A (en) 1981-04-09 1981-04-09 Data decoder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5355681A JPS57168583A (en) 1981-04-09 1981-04-09 Data decoder

Publications (1)

Publication Number Publication Date
JPS57168583A true JPS57168583A (en) 1982-10-16

Family

ID=12946073

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5355681A Pending JPS57168583A (en) 1981-04-09 1981-04-09 Data decoder

Country Status (1)

Country Link
JP (1) JPS57168583A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5930364A (en) * 1982-08-12 1984-02-17 Fujitsu Ltd Picture data compressing circuit
JPS59200581A (en) * 1983-04-11 1984-11-13 エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン Data compressing system and device
JPS603276A (en) * 1983-06-20 1985-01-09 Sanyo Electric Co Ltd Encoding circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5930364A (en) * 1982-08-12 1984-02-17 Fujitsu Ltd Picture data compressing circuit
JPS59200581A (en) * 1983-04-11 1984-11-13 エヌ・ベ−・フイリツプス・フル−イランペンフアブリケン Data compressing system and device
JPH0576171U (en) * 1983-04-11 1993-10-15 エヌ・ベー・フィリップス・フルーイランペンファブリケン Data compression and data compression dissociation device
JPS603276A (en) * 1983-06-20 1985-01-09 Sanyo Electric Co Ltd Encoding circuit

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