CA2077158A1 - Time-varying image signal coding/decoding system - Google Patents

Time-varying image signal coding/decoding system

Info

Publication number
CA2077158A1
CA2077158A1 CA2077158A CA2077158A CA2077158A1 CA 2077158 A1 CA2077158 A1 CA 2077158A1 CA 2077158 A CA2077158 A CA 2077158A CA 2077158 A CA2077158 A CA 2077158A CA 2077158 A1 CA2077158 A1 CA 2077158A1
Authority
CA
Canada
Prior art keywords
transform
time
image signal
varying image
circuit
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
CA2077158A
Other languages
French (fr)
Other versions
CA2077158C (en
Inventor
Toshio Koga
Masayuki Okajima
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
Toshio Koga
Masayuki Okajima
Nec Corporation
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 Toshio Koga, Masayuki Okajima, Nec Corporation filed Critical Toshio Koga
Publication of CA2077158A1 publication Critical patent/CA2077158A1/en
Application granted granted Critical
Publication of CA2077158C publication Critical patent/CA2077158C/en
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
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
    • 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
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
    • H04N19/619—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding the transform being operated outside the prediction loop
    • 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
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/107—Selection of coding mode or of prediction mode between spatial and temporal predictive coding, e.g. picture refresh

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

In the time-varying image signal coding apparatus, a local encoded signal is quantized by a quantizing circuit, and the quantized signal is selected when refreshing is to be accomplished, and subjected to code transform by a code transform circuit to be transmitted to a time-varying image signal decoding apparatus. The signal supplied from the quantizing circuit is a transform coefficient in the transform region, and this is divided into a plurality of groups to be refreshed on a group-by-group basis. The transfer control on a group-by-group basis when refreshing is to take place is accomplished with a control signal supplied from a switching control circuit, and this control signal also undergoes code transform by the code transform circuit to be transmitted to the time-varying image signal decoding apparatus. In the time-varying image signal decoding apparatus, in accordance with the switching control signal transmitted from the time-varying image signal coding apparatus, refreshing is achieved by such selection that the transform coefficient to be refreshed is directly written into a frame memory from a code inverse transform circuit.
When a time-varying image signal is to be transferred by using interframe transform and transform coding, grouping is achieved by the units of transform coefficient, and frames are rewritten with each group independent of others.
CA 2077158 1991-08-28 1992-08-28 Time-varying image signal coding/decoding system Expired - Fee Related CA2077158C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP215692/1991 1991-08-28
JP215693/1991 1991-08-28
JP21569391 1991-08-28
JP21569291 1991-08-28

Publications (2)

Publication Number Publication Date
CA2077158A1 true CA2077158A1 (en) 1993-03-01
CA2077158C CA2077158C (en) 1997-12-02

Family

ID=26520999

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2077158 Expired - Fee Related CA2077158C (en) 1991-08-28 1992-08-28 Time-varying image signal coding/decoding system

Country Status (3)

Country Link
JP (1) JP2867807B2 (en)
CA (1) CA2077158C (en)
GB (1) GB2259826B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2283876B (en) * 1993-11-09 1998-06-24 Matsushita Electric Ind Co Ltd Encoding and decoding code sequences and frames
EP0712252B1 (en) * 1994-05-30 2002-03-20 Ntt Mobile Communications Network Inc. Moving image encoding and decoding device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK0441168T3 (en) * 1990-02-06 1996-11-18 Alcatel Italia System, packet structure and device for processing outgoing information from a signal encoder

Also Published As

Publication number Publication date
JPH05252506A (en) 1993-09-28
JP2867807B2 (en) 1999-03-10
CA2077158C (en) 1997-12-02
GB2259826B (en) 1995-05-10
GB2259826A (en) 1993-03-24
GB9218397D0 (en) 1992-10-14

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