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JPS57174984A - Encoding and decoding system for halftone fascimile signal - Google Patents

Encoding and decoding system for halftone fascimile signal

Info

Publication number
JPS57174984A
JPS57174984A JP56059505A JP5950581A JPS57174984A JP S57174984 A JPS57174984 A JP S57174984A JP 56059505 A JP56059505 A JP 56059505A JP 5950581 A JP5950581 A JP 5950581A JP S57174984 A JPS57174984 A JP S57174984A
Authority
JP
Japan
Prior art keywords
gradation
encoder
information
picture
picture element
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
JP56059505A
Other languages
Japanese (ja)
Inventor
Makoto Kobayashi
Tetsuji Yamamoto
Yoshihiro Jinbo
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP56059505A priority Critical patent/JPS57174984A/en
Priority to US06/342,548 priority patent/US4409623A/en
Priority to FR8201450A priority patent/FR2499794B1/en
Priority to GB8202677A priority patent/GB2092416B/en
Priority to DE3202913A priority patent/DE3202913C2/en
Publication of JPS57174984A publication Critical patent/JPS57174984A/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
    • H04N1/4105—Bandwidth or redundancy reduction for halftone screened pictures

Landscapes

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

Abstract

PURPOSE:To obtain picture element information which corresponds to a picture element having a mean gradation by encoding and decoding pieces of picture element information by dividing a halftone signal into blocks of picture elements, and representing the gradation of each block by plural kinds of gradation information and picture element information showing resolution. CONSTITUTION:An encoder consists of a circuit 1 which separates gradation information and picture element information, a binary signal encoder 2, a gradation information encoder 3, a multiplexer part 4, etc., and the circuit 1 divides a halftone fascimile signal into blocks having sides each consisting of N pieces of picture elements. A picture- element information signal 6 separated by the circuit 1 is applied to the encoder 2, and a gradation information signal 7 is applied to and encoded by the encoder 3 to output encoded gradation data 9. The data 9 and picture-element information encoded data 8 from the encoder 2 are applied to the multiplexer part 4, and the data 8 and 9 are switched alternately by a flag for switching to output halftone encoded data 10. A decoder having constitution reverse of that of the decoder decodes the data 10 to find picture element information which corresponds to a picture element having a mean gradation.
JP56059505A 1981-01-31 1981-04-20 Encoding and decoding system for halftone fascimile signal Pending JPS57174984A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP56059505A JPS57174984A (en) 1981-04-20 1981-04-20 Encoding and decoding system for halftone fascimile signal
US06/342,548 US4409623A (en) 1981-01-31 1982-01-25 Method and equipment for processing gray scale facsimile signal
FR8201450A FR2499794B1 (en) 1981-01-31 1982-01-29 GRAY SCALE FACSIMILE SIGNAL PROCESSING METHOD AND EQUIPMENT
GB8202677A GB2092416B (en) 1981-01-31 1982-01-29 Method and equipment for processing gray scale facsimile signal
DE3202913A DE3202913C2 (en) 1981-01-31 1982-01-29 Method and apparatus for processing a facsimile signal containing gray scale components

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56059505A JPS57174984A (en) 1981-04-20 1981-04-20 Encoding and decoding system for halftone fascimile signal

Publications (1)

Publication Number Publication Date
JPS57174984A true JPS57174984A (en) 1982-10-27

Family

ID=13115183

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56059505A Pending JPS57174984A (en) 1981-01-31 1981-04-20 Encoding and decoding system for halftone fascimile signal

Country Status (1)

Country Link
JP (1) JPS57174984A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61269466A (en) * 1985-05-22 1986-11-28 Nippon Telegr & Teleph Corp <Ntt> Encoding system
DE4127920A1 (en) * 1990-08-23 1992-04-09 Fuji Xerox Co Ltd IMAGE CODING DEVICE

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61269466A (en) * 1985-05-22 1986-11-28 Nippon Telegr & Teleph Corp <Ntt> Encoding system
DE4127920A1 (en) * 1990-08-23 1992-04-09 Fuji Xerox Co Ltd IMAGE CODING DEVICE

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