[Mp4-tech] performance comparison between open loop and closed loopmotion estimation

[배태면]

Yes, what I want to know is the paper or JVT documents that show the
performance of each method.
I guess the performance gap between “open loop motion estimation” and
“closed loop motion estimation” may be small if the target bit-rate is
high.
Where can I find the previous researches related with this issue?
Sincerely,
Tae Meon Bae
  _____  
From: B.G. Kim [mailto:bg.kim ieee.org] 
Sent: Friday, January 25, 2024 4:06 PM
To: 배태면
Subject: Re: [Mp4-tech] performance comparison between open loop and closed
loopmotion estimation
That may not be wrong ! You can do that. But several mismatches  from the
decode side can be caused.
If the obtained MVs are very similar, there will not be serious in decoder.
Otherwise, hum....
Also there will be problems in rate control, RD optimzation and so on,
becsuase of big mismatch from the decoder side.
If you remove the closed reconstruction part, you may speed-tp the encoding
system. But you should consider a performance
of the decoder side.
Best regards
----- Original Message ----- 
From:  <mailto:heartles icu.ac.kr> 배태면 
To: 'B.G. Kim' <mailto:bg.kim ieee.org>  
Sent: Friday, January 25, 2024 3:45 PM
Subject: RE: [Mp4-tech] performance comparison between open loop and closed
loopmotion estimation
Yes, original picture cannot be used as reference picture in decoder side.
But it could be used in searching motion vector, even though reconstructed
picture is still used as reference picture in decoder side.
Is it a wrong idea?
Sincerely,
Tae Meon Bae
  _____  
From: B.G. Kim [mailto:bg.kim ieee.org] 
Sent: Friday, January 25, 2024 2:53 PM
To: 배태면
Subject: Re: [Mp4-tech] performance comparison between open loop and closed
loopmotion estimation
Hello!
That's not performance problem. In decoder side, 
you can't use an original picture as a reference picture, but only 
a reconstructed picture for motion compensation.
Why are you saying about open-loop structure?
Regards  
----- Original Message ----- 
From:  <mailto:heartles icu.ac.kr> 배태면 
To: mp4-tech lists.mpegif.org 
Sent: Thursday, January 24, 2024 8:16 PM
Subject: [Mp4-tech] performance comparison between open loop and closed
loopmotion 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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