CA1219945A - Method and circuit for demodulating encoded data of facsimile apparatus - Google Patents

Method and circuit for demodulating encoded data of facsimile apparatus

Info

Publication number
CA1219945A
CA1219945A CA000458576A CA458576A CA1219945A CA 1219945 A CA1219945 A CA 1219945A CA 000458576 A CA000458576 A CA 000458576A CA 458576 A CA458576 A CA 458576A CA 1219945 A CA1219945 A CA 1219945A
Authority
CA
Canada
Prior art keywords
line
address
decoding
reference line
mode
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.)
Expired
Application number
CA000458576A
Other languages
English (en)
French (fr)
Inventor
Nobuhiro Ohtani
Hidekazu Sakurai
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
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 filed Critical NEC Corp
Application granted granted Critical
Publication of CA1219945A publication Critical patent/CA1219945A/en
Expired 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)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Compression Of Band Width Or Redundancy In Fax (AREA)
CA000458576A 1983-07-12 1984-07-11 Method and circuit for demodulating encoded data of facsimile apparatus Expired CA1219945A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP58127166A JPS6019360A (ja) 1983-07-12 1983-07-12 フアクシミリの復号化回路
JP58-127166 1983-07-12

Publications (1)

Publication Number Publication Date
CA1219945A true CA1219945A (en) 1987-03-31

Family

ID=14953282

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000458576A Expired CA1219945A (en) 1983-07-12 1984-07-11 Method and circuit for demodulating encoded data of facsimile apparatus

Country Status (3)

Country Link
US (1) US4626921A (OSRAM)
JP (1) JPS6019360A (OSRAM)
CA (1) CA1219945A (OSRAM)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4760461A (en) * 1986-02-28 1988-07-26 Kabushiki Kaisha Toshiba Binary data compression and expansion processing apparatus
JPS63138881A (ja) * 1986-11-29 1988-06-10 Hitachi Ltd Ｍｒ符号伸長装置
JP2624659B2 (ja) * 1986-12-08 1997-06-25 株式会社日立製作所 重畳ブロック復号化装置
US4839738A (en) * 1987-04-22 1989-06-13 Advanced Micro Devices, Inc. Apparatus for decoding facsimile coded data to image data with coding and reference line windowing and color change detection
US4809081A (en) * 1987-06-10 1989-02-28 Gould Inc. Method and apparatus for decompressing encoded data
JPH02501699A (ja) * 1987-08-17 1990-06-07 ディジタル　イクイプメント　コーポレーション Ｃｃｉｔｔ符号化された絵素から絵素像データを生成するシステム
US4968135A (en) * 1987-08-17 1990-11-06 Digital Equipment Corporation System for producing pixel image data from CCITT encoded pixel data
EP0469716B1 (en) * 1990-07-03 1997-04-23 Canon Kabushiki Kaisha Image processing apparatus
JP2510353B2 (ja) * 1990-11-07 1996-06-26 村田機械株式会社 画像デ―タのスム―ジング処理方法
EP0493086B1 (en) * 1990-12-24 1997-05-21 Xerox Corporation Data decoding apparatus
US5206734A (en) * 1990-12-24 1993-04-27 Xerox Corporation Look ahead for high speed CCITT decompressor
JPH0541807A (ja) * 1991-07-04 1993-02-19 Nec Ic Microcomput Syst Ltd 二次元復号化装置
JP5509957B2 (ja) * 2010-03-18 2014-06-04 株式会社リコー 画像処理装置および画像処理方法、ならびに、画像形成装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3927251A (en) * 1973-05-18 1975-12-16 Rca Corp Method and apparatus for the detection and control of errors in two-dimensionally compressed image data
JPS54134919A (en) * 1978-04-12 1979-10-19 Fujitsu Ltd Restoration system for compressed data
CA1128645A (en) * 1978-07-31 1982-07-27 Yasuhiro Yamazaki Transmission method and system for facsimile signal
JPS55128967A (en) * 1979-03-28 1980-10-06 Ricoh Co Ltd Encoding device
JPS57162884A (en) * 1981-03-31 1982-10-06 Fujitsu Ltd Image data restoration processor
JPS57181272A (en) * 1982-04-28 1982-11-08 Hitachi Ltd Binary picture decoding
US4486784A (en) * 1982-12-27 1984-12-04 International Business Machines Corporation Image compression systems

Also Published As

Publication number Publication date
JPS6019360A (ja) 1985-01-31
JPH0220195B2 (OSRAM) 1990-05-08
US4626921A (en) 1986-12-02

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