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Annex 4 to Doc. AVC-106R
Annex 4 to Doc. AVC-106R

ADDITIONAL SUBMISSION MATERIALS FOR THE "KURIHAMA TESTS"


Source : CCITT Experts Group for ATM Video Coding 
Title  : Additional Submission Materials for the "Kurihama
         Tests"
Date   : August 16, 1991
Purpose: Proposal

One of the important objectives for the joint development of high quality 
video coding among MPEG, CCITT Experts Group and CMTT/2 Special 
Rapporteur's Group is to standardize a generic coding algorithm with bit 
rates up to 10 Mbit/s, including communications service as one of the 
essential applications.  Such transmission bit rates are provided by ATM 
based B-ISDN.

User information is transported with cells in the ATM network, and some 
cells are inevitably lost due to network congestion or other reasons.  If 
one cell is lost, the decoder loses 384 (or slightly less) user bits 
consecutively.

Since this large number of lost bits affect significantly the decoder 
operation and subsequent reconstructed pictures, and since we have better 
chance to optimize the coding performance by integrating the source coding 
and the transmission coding, the CCITT Experts Group request that the cell 
loss resilience be considered by all the coding algorithm proposers from 
the start. 

From this standpoint, the CCITT Experts Group proposes the following 
additions to the PPD document;

[1] ��6.2.1 3) i.

	Any claims for additional features (such as cell loss resilience) 
should be supported by demonstrations.

[2] ��6.2.1 4) c. the last hyphenated item

    -	any other functionalities if claimed (Note)

Note  To demonstrate cell loss resilience, it is recommended to 
simulate 10-3 cell loss ratio, e.g. by replacing 384 coded bits every 
0.1 sec with '0', decoding the resultant bit stream and reconstructing 
pictures. Exact method of simulation should be described.


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