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

[Gary Sullivan]

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
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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