[Mp4-tech] [video] performance comparison between open loopandclosed loop motion estimation

[배태면]

Dear Andrew,
Can you explain what you disclose in more detail? 
Or, do you have any publication related with this subject?
Sincerely,
Tae Meon Bae
  _____  
From: mp4-tech-bounces lists.mpegif.org [mailto:mp4-tech-
bounces lists.mpegif.org] On Behalf Of Andrew Krupiczka
Sent: Saturday, January 26, 2024 3:46 AM
To: Gary Sullivan; ???; mp4-tech lists.mpegif.org
Subject: RE: [Mp4-tech] [video] performance comparison between open
loopandclosed loop motion estimation
Tae Meon Bae, Gary,
I got it now... In my understanding, as long as ME only is concerned, you
might take anything you want as your "reference" input frame, either
reconstructed (what most people do) original one, combination of both or
some another one for example initially, pre-processed/transformed (what I
think some people might be doing), that you think will give you "an
encoding edge" in terms of compression ratio and/or quality. What I can
disclose, is that we've tested at least one ME algorithm having "an
encoding edge" most of time when using a corresponding original frame
instead of reconstructed one and becoming a "ME reference frame". 
Best regards,
Andrew
-----Original Message-----
From: mp4-tech-bounces lists.mpegif.org [mailto:mp4-tech-
bounces lists.mpegif.org] On Behalf Of Gary Sullivan
Sent: Friday, January 25, 2024 12:42 PM
To: ???; mp4-tech lists.mpegif.org
Subject: RE: [Mp4-tech] [video] performance comparison between open loop
andclosed loop motion estimation
Tae Meon Bae et al,
I see.  I thought that might be what you meant, but I wasn't sure.  I don't
recall any publications or standardization documents on that topic.  One
important thing to keep in mind is that there may be a significant
difference between "objective" (e.g., PSNR) and subjective quality
relationships in this case.  In some cases the "open loop" scheme may
actually improve subjective quality, as it may result in motion vectors
that more closely and coherently model the true motion of the objects in
the scene.
Best Regards,
Gary Sullivan
  _____  
From: 배태면 [mailto:heartles icu.ac.kr] 
Sent: Thursday, January 24, 2024 8:32 PM
To: Gary Sullivan; mp4-tech lists.mpegif.org
Subject: RE: [Mp4-tech] [video] performance comparison between open loop
and closed loop motion estimation
Dear Gary,
I used the “open loop motion estimation” as motion estimation using
original picture as a reference frame.
And I used the “closed loop motion estimation” to represent the motion
estimation using reconstructed picture as reference frame.
I though that it is common concept. If it is not so, I’m sorry for the
misunderstanding. 
Sincerely,
Tae Meon Bae
  _____  
From: Gary Sullivan [mailto:garysull windows.microsoft.com] 
Sent: Friday, January 25, 2024 3:48 AM
To: 배태면; mp4-tech lists.mpegif.org
Subject: RE: [Mp4-tech] performance comparison between open loop and closed
loop motion estimation
Tae Meon Bae,
What do you mean by open loop motion estimation?
Best Regards,
Gary Sullivan
  _____  
From: mp4-tech-bounces lists.mpegif.org [mailto:mp4-tech-
bounces lists.mpegif.org] On Behalf Of ???
Sent: Thursday, January 24, 2024 3:16 AM
To: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] performance comparison between open loop and closed
loop motion estimation
  <http://mail.icu.ac.kr:80/nara/servlet/webmail.WebMailReConfServ/614641> 
Dear experts,
I'm optimizing h.264 encoder, and I have a question about motion estimation.
Generally open loop motion estimation shows lower performance than closed
motion estimation. Is there any JVT document or paper related with this
issue? I guess that the performance gap may be small if the target bit rate
is high enough. Is this assumption right? 
Thanks in advance.
Sincerely,
Tae Meon Bae
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