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Annex 1 to Doc. AVC-22R
Annex 1 to Doc. AVC-22R
Documents for the first meeting of the Experts Group
Normal Documents
AVC-1 ADDRESS OF COORDINATING MEMBERS AND LIAISON REPRESENTATIVES
(SECRETARIAT)
AVC-2 EXCERPT OF THE WPXV/1 MEETING REPORT - JULY 1990 (CHAIRMAN)
Establishment of the Experts Group for ATM Video Coding was decided at the
July 1990 meeting of Study Group XV. Terms of reference of this group,
membership and working method, work plan, chairmanship, and liaison
statements to relevant standardization bodies are described.
AVC-3 PHASE-2 WORK OF MPEG (CHAIRMAN)
MPEG has initiated its second phase work for "coding of moving pictures for
DSM having a throughput of up to 10 Mbit/s". This document presents MPEG
organization, its terms of reference, work schedule highlighting the
subjective test in July 1991, and requirements for the second phase work.
AVC-4 IMPACT OF ATM NETWORKS ON VIDEO CODING (AUSTRALIA)
Major characteristics of ATM-based B-ISDN and their impacts on video coding
are identified as follows;
- Variable rate video coding which provides better picture quality/rate
trade-off and less end-to-end delay.
- Cell loss, which may lead to the use of layered coding and cell
priority assignment.
- Service integration because of service independent nature of the
network, which requires a common video coding method; "universal
video coding".
- Network flexibility requiring an appropriate method of handling
multimedia or multichannel connections.
As a conclusion, consistency of the target video coding scheme with the
direction of B-ISDN standards is emphasized.
AVC-5 UNIVERSAL VIDEO CODING FOR ATM NETWORKS (AUSTRALIA)
A Universal Video Coding approach, which is based on a hierarchical, layered
coding with different sets of layers corresponding to different service
classes, is proposed for integration of video signal representation and
coding. The following study items are identified;
- Practicality of the scheme: range of parameters defining the service
classes and appropriate hierarchies.
- Optimum coding of each layer.
- Cost/complexity trade-off.
- Incorporation of or migration form existing coding schemes.
- Flexibility to accommodate future improvements of the algorithm.
- Accommodation of still image coding.
It is proposed that the group should investigate the practicality of the
Universal Coding approach and further develop the concept as a target
architecture of the ATM video coding.
AVC-6 SIGNALLING FOR AUDIOVISUAL OR MULTIMEDIA CONNECTION ON ATM
NETWORKS (AUSTRALIA)
It is pointed out that studies on network and end-to-end signalling
appropriate for multiplexing of audio, video, and data are required in the
light of virtual channel based connections in ATM networks. Error
protection mechanism and encryption aspects are also touched upon.
AVC-7 JAPANESE ACTIVITIES ON ATM VIDEO CODING STANDARDS (JAPAN)
"AV&ATM Video Coding Subcommittee" is introduced as a national experts
group in Japan which works tied up with the CCITT's Experts Group.
AVC-8 CONSIDERATION ABOUT ATM CODING APPLICATIONS AND FEATURES (JAPAN)
To facilitate setting objectives of the ATM video coding standard, possible
applications and technical requirements to be met are listed up as a
summary matrix. Technical requirements are presented in terms of
resolution, picture quality and delay. It is stressed that the new standard
should cover higher resolution and quality up to the HDTV level.
AVC-9 CONNECTIVITY WITH CURRENT SYSTEM AND RECOMMENDATION SCHEDULE
(JAPAN)
As to the connectivity, the opinion is summarized as follows;
- To keep compatibility of ATM video coding with the existing standard
is preferable.
- For low bit rate STM networks, the "terminal level" connectivity is
indispensable.
- For high bit rate ATM networks, H.261 may be modified to some extent.
The extent of modification is to be studied.
As to the schedule toward recommending an ATM video coding standard, it is
suggested to make an outline recommendation in 1992 and a final one until
1994.
AVC-10 TECHNICAL PROBLEMS AND PROCEDURES (JAPAN)
Technical problems are picked up which should be worked out or clarified by
the Group. Among them, "requirements for network characteristics" is
recognized as the most urgent taking into account the SGXVIII activities.
For the group's working method, step by step one based on a reference
model with verification by hardware is proposed. This document also
provides information on activities of participating organizations.
AVC-11 ATM ADAPTATION LAYER - AAL (JAPAN)
The aim of this document is to clarify the AAL problems, particularly from
multimedia multiplex point of view. Taking AAL Type 2/I.363 as a basis,
discussion points for each of the AAL elements (SN, IT, LI and CRC) are
described. As a conclusion, it is stressed that a framework for multimedia
multiplex in ATM environments should be established at the earliest stage.
AVC-12 VIDEO CODING ACTIVITIES IN CMTT (LIAISON REPRESENTATIVE FOR CMTT)
The organization of CMTT is presented which has Working Party CMTT/B and
Task Groups CMTT/2 and CMTT/3 having close relation to the activity of this
Experts Group. CMTT's activities on contribution, HDTV digital transmission
and secondary distribution are briefed. Considering that CCITT's Experts
Group and MPEG are looking into generic video coding for television signal
transmission and storage, close collaboration is emphasized to avoid work
duplication and different standards for the same application.
AVC-13 COMPENDIUM ATM - CODING PROCEDURES
(NETHERLANDS,GERMANY, UNITED KINGDOM, FRANCE, NORWAY, SWEDEN,
PORTUGAL, ITALY, SPAIN, BELGIUM)
Results of the extensive study which has been carried out in the COST 211
project are reported. The following topics are covered;
- Terminology
- Coding models
- The H.261 capabilities for ATM
- Impact of QOS and preventive policing on coding performance
- Bit rate versus quality
- Guidelines for simulation
- Guidelines for hardware experiments.
AVC-14 INTERCONNECTIVITY OF FUTURE AV-SYSTEMS
(THE ROYAL NETHERLANDS PTT, PTT CONTEST)
Necessity of interworking among existing and future audiovisual systems are
discussed from different point of view; technical achievements, applications,
standardization and implication of marketing. It is stressed that we should
bear in mind the users request and achieve the highest level of
compatibility. Analysis of interconnections is tried from several angles;
analog connection, digital CCIR 601 connection, digital connection with
simple transcoding, and direct digital connection.
AVC-15 ATM VIDEO CODING
(AT&T, DIS, DAVID SARNOFF LABS, PICTURETEL, APPLE COMPUTER)
US views are presented to various aspects of the work to be done by the
Experts Group;
- Major effort is needed for performance analysis of ATM video coding
systems in terms of coding efficiency and network requirements to
clarify the constant quality/variable bit rate concept.
- Efforts should be made to define work areas and their priorities by
considering service, coding, and network aspects.
- The primary focus of ATM video coding work should first be shifted
toward service applications showing the greatest promise in terms of
network utilization.
- As to the picture format, CCIR Rec. 601 should provide the next option
to CIF for higher bit rate applications.
-Applications requiring EDTV or HDTV should be given lower priority
pending clarification of related TV standards.
- A level of compatibility should exist between the existing and the new
coding schemes.
- A realistic network model should be developed.
- AAL should be considered.
- The group should coordinate its activities with SGXVIII.
AVC-16 COMMENTS ON "MEMORANDUM OF TOPICS"
(BELGIUM, FRANCE, FRG, ITALY, NETHERLANDS, NORWAY, UK)
This document summarizes European views concerning the topics and work
plan of the new ATM video coding Experts Group. Some of which are listed
as follows;
- The Group should initially focus on standard TV signals, taking into
account extension to higher resolutions.
- Less delay than that of the current system should be sought.
- Bit rate range: 64 kbit/s to a few tens Mbit/s initially, higher bit
rates later.
- Compatibility with existing AV Recommendations should strongly
influence the decisions of the Group.
- The Group should finalize a coding standard in 1994, but produce a
framework recommendation in 1992.
- A step by step method using Reference Models and hardware trials are
supported.
- Collaboration with MPEG and CMTT should be as close as possible.
AVC-17 OUTSTANDING ISSUES ON LOW BIT RATE VIDEO CODING FOR ATM NETWORKS
(BELGIUM, FRANCE, FRG, ITALY, NETHERLANDS, NORWAY, UK)
Current status of European studies is reported which aims near constant
quality, shorter delays and more efficient use of network resources.
Advantages and disadvantages of "one layer CBR, "one layer VBR", "two layer
CBR/VBR" and "two layer VBR/VBR" are compared. Error concealment
technique for protecting against bit errors and cell loss is also described.
As a conclusion, unresolved issues consisting of ATM network issues and
video coding issues are listed up.
AVC-18 CONSIDERATIONS CONCERNING THE STANDARDISATION OF AAL(S) FOR VIDEO
SERVICES (BELGIUM, FRANCE, FRG, ITALY, NETHERLANDS, NORWAY, UK)
Problems to obtain AALs suitable for video services are listed up. It is
proposed to distinguish between the following two approaches:
- An AAL suitable for existing video services should be standardized in
a relatively short term, taking into account compatibility issues.
- An AAL matched with the video coding algorithm should be found.
Requirements for the second category are also listed up. It is stressed
that the second category AAL should be defined together with the new video
coding algorithm.
AVC-19 VIDEO CODEC DEVELOPED IN THE BELGIAN BROADBAND EXPERIMENT
(RTT BELGIUM)
Information on the sate of art video codec is provided. The hardware has
two working modes; variable bit rate mode and adjustable fixed bit rate
mode. Hardware configuration, VLSI implementation, and performance in terms
of operating bit rates are also described.
AVC-20 IMPACT OF THE ATM TECHNIQUE ON VIDEO CODING (BELL TELEPHONE)
ATM characteristics which have impacts on video coding are overviewed;
availability of high bandwidths, high bandwidth flexibility, variable bit rate
capability, cell loss, cell jitter and packetization delay. Video coding
techniques which adapt to the ATM network characteristics are also listed
up; coding at high bit rates, multiplexing of service components, user
selectable picture quality and bit rate, layered coding, cell loss correction
and concealment, and service synchronization.
AVC-21 TWELFTH MEETING REPORT OF ISO/IEC JTC1/SC2/WG11 (CONVENOR)
This document reports MPEG meeting report held in Santa Clara in September
1990, covering WG11 plenary as well as subgroups consisting of MPEG/Video,
MPEG/Audio, MPEG/Systems, MPEG/VLSI, MPEG/Tests and MPEG/DSM.
Temporary Documents
TD-1 Agenda for The Hague meeting (Chairman)
TD-2 Available documents (Chairman)
TD-3 List of tape demonstrations (Chairman)
TD-4 Discussion items in the first meeting of the Experts Group (Chairman)
TD-5 Work plan (Chairman)
TD-6 Draft summary of Tuesday discussion on harmonization with other
groups (Chairman)
TD-7 Proposal for possible collaboration between SGXV/1 Experts Group on
ATM video coding, ISO/MPEG and CMTT (Belgium)
TD-8 Draft letter to Dr. L. Chiariglione, Convenor of ISO/IEC JTC1/SC2/WG11
(Small group on harmonization)
TD-9 H.26x provisional requirements (Small group on harmonization)
TD-10 Work plan - revised (Small group on harmonization)
TD-11 First simplified network model (Small group on network model)
TD-12 Draft liaison to SGXVIII - requirements for B-ISDN network model as it
impacts on video coding (Small group on liaison to SGXVIII)
TD-13 Draft report of the first meeting of the Experts Group for ATM Video
Coding (Chairman)
END