GB2120504B - Compression process for a digitalized image - Google Patents

Compression process for a digitalized image

Info

Publication number
GB2120504B
GB2120504B GB8215894A GB8215894A GB2120504B GB 2120504 B GB2120504 B GB 2120504B GB 8215894 A GB8215894 A GB 8215894A GB 8215894 A GB8215894 A GB 8215894A GB 2120504 B GB2120504 B GB 2120504B
Authority
GB
United Kingdom
Prior art keywords
values
brightness
coded
difference
compression process
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
GB8215894A
Other versions
GB2120504A (en
Inventor
Clercq Oliver De
Andre Marguinaud
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of GB2120504A publication Critical patent/GB2120504A/en
Application granted granted Critical
Publication of GB2120504B publication Critical patent/GB2120504B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00007—Time or data compression or expansion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/04—Colour television systems using pulse code modulation
    • H04N11/042—Codec means
    • H04N11/046—DPCM
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

The digital values, Bij, of the brightness of points in the i<th> line undergo differential coding with, as reference, the brightness values, Bi-1,j, Bi-1,j-1 or Bi-1,j+1, of the points in the (i-1)<th> line. They are coded by blocks of consecutive values such that the difference in brightness of each point with respect to its point of reference is identical to within a tolerance 2e. The values, Bij, of a block are all coded with respect to the value Bi-1,j or the values Bi-1,j-1 or the values Bi-1,j+1, chosen in order to minimise the difference in brightness. Each block is coded by its brightness difference value, its length and a binary word indicating whether the respective references are Bi-1,j, Bi-1,j-1 or Bi-1,j+1.
GB8215894A 1981-06-02 1982-06-01 Compression process for a digitalized image Expired GB2120504B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8110898A FR2524740B1 (en) 1981-06-02 1981-06-02 METHOD FOR COMPRESSING A DIGITAL IMAGE

Publications (2)

Publication Number Publication Date
GB2120504A GB2120504A (en) 1983-11-30
GB2120504B true GB2120504B (en) 1985-03-13

Family

ID=9259101

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8215894A Expired GB2120504B (en) 1981-06-02 1982-06-01 Compression process for a digitalized image

Country Status (3)

Country Link
DE (1) DE3219892A1 (en)
FR (1) FR2524740B1 (en)
GB (1) GB2120504B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4605963A (en) * 1983-08-15 1986-08-12 Rca Corporation Reduction of control bits for adaptive sub-nyquist encoder
JPS60185469A (en) * 1984-03-03 1985-09-20 Dainippon Screen Mfg Co Ltd Reading method of picture signal
WO1989010675A1 (en) * 1988-04-27 1989-11-02 Uvc Corp. Method and system for compressing color video data
US4847677A (en) * 1988-04-27 1989-07-11 Universal Video Communications Corp. Video telecommunication system and method for compressing and decompressing digital color video data
CA1326898C (en) * 1988-04-27 1994-02-08 John Music Method and system for decompressing color video encoded data
BR8906930A (en) * 1988-04-27 1990-12-11 Uvc Corp PROCESS AND SYSTEM FOR COMPACTING AND DECOMPACTING DATA IN COLOR DIGITAL VIDEO IN A VIDEO COMMUNICATION SYSTEM
US6512853B2 (en) 1995-08-14 2003-01-28 Barkfort Limited Method and apparatus for compressing digital image data
DE69610987T2 (en) * 1995-08-14 2001-05-23 Barkfort Ltd., Malahide METHOD AND DEVICE FOR COMPRESSING DIGITAL IMAGE DATA

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1598343A (en) * 1977-04-04 1981-09-16 Int Computers Ltd Display systems
FR2450016A1 (en) * 1979-02-23 1980-09-19 Arnaud Jean METHOD AND APPARATUS FOR COMPRESSING DATA, ESPECIALLY TELEVISION SIGNALS

Also Published As

Publication number Publication date
DE3219892A1 (en) 1983-12-01
GB2120504A (en) 1983-11-30
FR2524740A1 (en) 1983-10-07
FR2524740B1 (en) 1986-09-19

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee