CA2019133A1 - Methode de compression a haute qualite d'images de texte binaires - Google Patents

Methode de compression a haute qualite d'images de texte binaires

Info

Publication number
CA2019133A1
CA2019133A1 CA2019133A CA2019133A CA2019133A1 CA 2019133 A1 CA2019133 A1 CA 2019133A1 CA 2019133 A CA2019133 A CA 2019133A CA 2019133 A CA2019133 A CA 2019133A CA 2019133 A1 CA2019133 A1 CA 2019133A1
Authority
CA
Canada
Prior art keywords
compression
decompression
frequency areas
file
lossless
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
CA2019133A
Other languages
English (en)
Other versions
CA2019133C (fr
Inventor
Dan Shmuel Chevion
Ehud Dov Karnin
Eugeniusz Walach
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of CA2019133A1 publication Critical patent/CA2019133A1/fr
Application granted granted Critical
Publication of CA2019133C publication Critical patent/CA2019133C/fr
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T9/00—Image coding

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Image Processing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Compression Of Band Width Or Redundancy In Fax (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
CA002019133A 1989-08-04 1990-06-15 Methode de compression a haute qualite d'images de texte binaires Expired - Fee Related CA2019133C (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL9122189A IL91221A (en) 1989-08-04 1989-08-04 Binary text compression method
IL91221 1989-08-04

Publications (2)

Publication Number Publication Date
CA2019133A1 true CA2019133A1 (fr) 1991-02-04
CA2019133C CA2019133C (fr) 1995-05-30

Family

ID=11060248

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002019133A Expired - Fee Related CA2019133C (fr) 1989-08-04 1990-06-15 Methode de compression a haute qualite d'images de texte binaires

Country Status (7)

Country Link
US (1) US5204756A (fr)
EP (1) EP0411232B1 (fr)
JP (1) JP2531840B2 (fr)
CA (1) CA2019133C (fr)
DE (1) DE68925281T2 (fr)
ES (1) ES2081859T3 (fr)
IL (1) IL91221A (fr)

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Also Published As

Publication number Publication date
EP0411232A3 (en) 1992-01-29
ES2081859T3 (es) 1996-03-16
IL91221A (en) 1995-03-30
JPH03165181A (ja) 1991-07-17
CA2019133C (fr) 1995-05-30
US5204756A (en) 1993-04-20
IL91221A0 (en) 1990-03-19
DE68925281D1 (de) 1996-02-08
EP0411232A2 (fr) 1991-02-06
DE68925281T2 (de) 1996-07-11
JP2531840B2 (ja) 1996-09-04
EP0411232B1 (fr) 1995-12-27

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