[M4IF Technotes] De-blocking/De-ringing

[Yi Li]

Hello,
I have some question regarding the de-blocking and de-ringing filters.  The
MPEG-4 visual discussed briefly a method to reduce the computational cost of
de-blocking/de-ringing.  This is achieved by defining ringing and blocking
semaphores.   However,  it is not quite clear to me how to use those
semaphores since the descriptions are too short.  Does any one have more
detailed info on that?  The spec also mentions a reference simply called
M2723 (maybe this is a MPEG-4 spec ref number).  Do anyone have a electronic
copy of that document?
Thanks 
Yi Li