[Mp4-tech] question ME algorithm

[Wang Hui]

Dear sir:
Thank you for your email very much.
I have check the implementation carefully step by step,
It runs just as the algorithm description, TSS and
LOG method. 
I think the algorithm implementations are with no errors, but the
configuration and the subsequently processing may be wrong.
The all methods run without the 4MV support and half-pel search.
The search range is just same as the Full search.
I think that in the fast algorithms, the 'Intra' Macroblocks must
be more than that in the Full-search algorithm. how many are 'Intra'
Macroblocks  reasonalbe compare to the Full search method?
For I have no experiences about the ME algorithm implementations, 
I want to known in this case, what should be notice? and what does 
result in this type of errors?
best regards
Michael  
----- Original Message ----- 
From: "sunx" <sunx pollux.usc.edu>
To: "Wang Hui" <wangh china.com>
Cc: "MP4-Tech" <MP4-Tech lists.mpegif.org>
Sent: Sunday, December 07, 2023 1:57 PM
Subject: Re: [Mp4-tech] question ME algorithm
> 
> 
> On Sun, 7 Dec 2003, Wang Hui wrote:
> 
> >
> > Dear all:
> >
> >
> >  In the MPEG-4 verification model, the full search ME is implemented.
> >
> >  I have embedded the FSS and LOG ME algorithm into the MPEG-4 VM,
> >  but for the motion vectors obtained by the fast search methods is worse than
> >  Full Search algorithm, so the number of macroblocks with type "Intra" coding
> >  more than the Full Search mehtod, increasing about 1/6 compared to Full Search
> >  one.
> ^^^^^^^
> Please double check your implementation of the fast search methods. They
> should be logically the same as the full search algorithm.
> 
> >
> >  When no bit rate control is applied, the PSNR values of FSS and LOG method
> >  are better than that Full Search method, wherear if the bit rate control is applied,
> >  sometimes the PSNR value of fast searchmethods  also better than Full search method.
> >
> >  I want to ask whether the results is correct, if the results is resonalbe, then how to
> >  compare the performance of different ME methods.
> >
> >
> >  best regards
> >
> >
> >  Michael
> >
> >
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> >
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