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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Dear all,</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Ok, it now is clarified that motion-vectors of sizes
like 500 are legal and it was shown how it can happen that these sizes are
generated. I think there is more to it though:</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Do these vectors represent a true motion of 125 full
pels, or has the estimation algorithm gone into some local minima far away from
the “real” motion?</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>I believe, most of the time these very large vectors
produce largely suboptimal results. </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>To avoid the drift to larger and larger values one
could first do a RD-weighted check whether motion compensation with the
predictor (you called it candidate position!?) generates a better result than
motion compensation with (0,0). </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>If (0,0) wins, we would do our search from there. </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Maybe there are better methods to avoid this drift,
but what ever method, it could be a simple way to further improve coding
efficiency. </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Regards</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> Peter</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> </span></font></p>
<div>
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style='font-size:8.0pt;font-family:Arial;color:teal'>-----------------------------------------------------------------</span></font></p>
<p class=MsoNormal><font size=1 color="#006699" face=Arial><span lang=EN-GB
style='font-size:8.0pt;font-family:Arial;color:#006699'>Dr. Peter List</span></font></p>
<p class=MsoNormal><font size=1 color="#006699" face=Arial><span lang=EN-GB
style='font-size:8.0pt;font-family:Arial;color:#006699'>Senior Engineer</span></font></p>
<p class=MsoNormal><font size=1 color="#006699" face=Arial><span lang=EN-GB
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