[M4IF Technotes] Question about Quarter-pel Motion Compensation

[Gary Sullivan]

I think in the case of quarter-pel, that entry would be interpreted as
-32 in quarter-sample units (-8 in full-sample units).
-Gary
+> -----Original Message-----
+> From: Xue Xuhong [mailto:xxh   soft.thtf.com.cn] 
+> Sent: Tuesday, January 21, 2024 6:30 PM
+> To: technotes   lists.m4if.org
+> Subject: [M4IF Technotes] Question about Quarter-pel Motion 
+> Compensation
+> 
+> 
+> Hi,
+> 
+> In the VLC table for MVD( Table B-12,  in the standard) , it 
+> seems that the
+> "-16", "-15.5"... are in the unit of pel.
+> which is showed below:
+> 
+> Code                      MVD
+> 0000 0000 0010 1       -16
+> 0000 0000 0011 1       -15.5
+> 0000 0000 0101         -15
+> ...
+> 
+> When the Quarter-pel Motion Compensation is used, if the codes in the
+> bitstram is 0000 0000 00101, should we get the MVD as
+> "-16" in pel unit, then transform it to -16*4=64 in 1/4 pel unit?
+> 
+> 
+> Regards,
+> Xue Xuhong
+> 
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