GB2009568A - Picture signal coding apparatus - Google Patents

Picture signal coding apparatus

Info

Publication number
GB2009568A
GB2009568A GB7845201A GB7845201A GB2009568A GB 2009568 A GB2009568 A GB 2009568A GB 7845201 A GB7845201 A GB 7845201A GB 7845201 A GB7845201 A GB 7845201A GB 2009568 A GB2009568 A GB 2009568A
Authority
GB
United Kingdom
Prior art keywords
block
coding apparatus
values
picture signal
memory
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
GB7845201A
Other versions
GB2009568B (en
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
Priority claimed from JP14238977A external-priority patent/JPS5474623A/en
Priority claimed from JP638878A external-priority patent/JPS5499512A/en
Priority claimed from JP639078A external-priority patent/JPS5499514A/en
Priority claimed from JP638978A external-priority patent/JPS5499513A/en
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Publication of GB2009568A publication Critical patent/GB2009568A/en
Application granted granted Critical
Publication of GB2009568B publication Critical patent/GB2009568B/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
    • H04N19/98—Adaptive-dynamic-range coding [ADRC]

Landscapes

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

Abstract

A gray-scaled picture is divided in a TV camera into blocks each block being composed of a number of elements. The picture signal is stored in a memory 13 and is read from the memory by a coding apparatus 14. In the coding apparatus the picture information stored is processed to provide, for a block, grey scale values a0, a1, typical of the block, as well as a threshold value xt used to determine, for each block, which of the two values a0, a1, should be applied to it for coding. Each block is thus coded by transmitting the values a0, a1, and, for each element, a parameter phi i determining on which side of the threshold xt the element lies. The converted codes are stored in a buffer memory 15 from which they can be read out at a constant speed and supplied to a transmission line through a modem. <IMAGE>
GB7845201A 1977-11-28 1978-11-20 Picture signal coding apparatus Expired GB2009568B (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP14238977A JPS5474623A (en) 1977-11-28 1977-11-28 Coding processing system for video signal
JP638878A JPS5499512A (en) 1978-01-24 1978-01-24 Encoding/decoding process system for picture signal
JP639078A JPS5499514A (en) 1978-01-24 1978-01-24 Encoding process system for picture signal
JP638978A JPS5499513A (en) 1978-01-24 1978-01-24 Encoding system of picture signal

Publications (2)

Publication Number Publication Date
GB2009568A true GB2009568A (en) 1979-06-13
GB2009568B GB2009568B (en) 1982-03-24

Family

ID=27454474

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7845201A Expired GB2009568B (en) 1977-11-28 1978-11-20 Picture signal coding apparatus

Country Status (3)

Country Link
DE (1) DE2851481C2 (en)
FR (1) FR2410401A1 (en)
GB (1) GB2009568B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2173675A (en) * 1985-03-22 1986-10-15 Steven Henry Lerman Communication system
GB2238928A (en) * 1989-09-05 1991-06-12 Canon Kk Image processing
GB2238927A (en) * 1989-09-05 1991-06-12 Canon Kk Image processing

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266249A (en) * 1978-09-19 1981-05-05 Bell Telephone Laboratories, Incorporated Digital encoder for facsimile transmission
US4319267A (en) * 1979-02-16 1982-03-09 Nippon Telegraph And Telephone Public Corporation Picture coding and/or decoding equipment
DE3043521A1 (en) * 1980-11-18 1982-06-24 Agfa-Gevaert Ag, 5090 Leverkusen Digital processing of document scan - uses nonlinearly encoded digital signal to give image-improving weighting
US4409623A (en) * 1981-01-31 1983-10-11 Nippon Telegraph & Telephone Public Corporation Method and equipment for processing gray scale facsimile signal
GB2129652B (en) * 1982-10-27 1986-06-04 Matsushita Electric Ind Co Ltd Method and apparatus for processing image signal
GB2149994B (en) * 1983-11-14 1987-05-20 Matsushita Electric Ind Co Ltd Method and apparatus for processing video signals
JPS6186834A (en) * 1984-10-04 1986-05-02 Olympus Optical Co Ltd Transfer device for picture data

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3403226A (en) * 1965-09-30 1968-09-24 Bell Telephone Labor Inc Reduced bandwidth dual mode encoding of video signals
DE2020639A1 (en) * 1970-04-28 1971-11-18 Bosch Elektronik Gmbh Method for the electrical transmission of original images
JPS5220091B2 (en) * 1972-08-23 1977-06-01
US3984626A (en) * 1975-08-01 1976-10-05 Bell Telephone Laboratories, Incorporated Picture signal coder
FR2329124A1 (en) * 1975-10-24 1977-05-20 Telecommunications Sa MATRIX-TRANSFORMED IMAGE ENCODER-DECODER WITH WEIGHTING OF THE CONTRIBUTIONS OF THE IMAGE POINTS TO THE FORMATION OF THE TRANSFORMATION
US4032977A (en) * 1976-06-03 1977-06-28 Xerox Corporation Gray scale interpolation technique

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2173675A (en) * 1985-03-22 1986-10-15 Steven Henry Lerman Communication system
GB2238928A (en) * 1989-09-05 1991-06-12 Canon Kk Image processing
GB2238927A (en) * 1989-09-05 1991-06-12 Canon Kk Image processing
GB2238927B (en) * 1989-09-05 1994-05-18 Canon Kk Image processing apparatus
GB2238928B (en) * 1989-09-05 1994-06-08 Canon Kk Image data converting method and image processing apparatus
US5488672A (en) * 1989-09-05 1996-01-30 Canon Kabushiki Kaisha Color image processing apparatus
US5796931A (en) * 1989-09-05 1998-08-18 Canon Kabushiki Kaisha Image data converting method and image processing apparatus

Also Published As

Publication number Publication date
FR2410401A1 (en) 1979-06-22
FR2410401B1 (en) 1984-06-29
DE2851481A1 (en) 1979-05-31
DE2851481C2 (en) 1982-05-06
GB2009568B (en) 1982-03-24

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 19981119