[XviD-devel] Trellis Quant

Christoph Lampert chl at math.uni-bonn.de
Thu May 1 16:28:03 CEST 2003


A small plot (<10K) for Trellis Quant and QPel:
The plot is (apart from some extra stuff):

1) Halfpel
2) Halfpel + Trellis
3) Qpel
4) Qpel + Trellis

at 256kbps for 6 CIF-clips: coastguard.cif  container.cif  foreman.cif
hall_monitor.cif  mobile.cif  paris.cif   in this order. 

As you can see, Trellis always helps PSNR, but not as much as QPel, _if_
Qpel helps at all (which it does in 5 out of 6 cases). 

For speed, a similar trend is visible: QPel is slower than Trellis, but
that may change when more ASM is in the source. Also, Trellis' speed
depends on bitrate/quantizer, Qpel's doesn't.

gruel

-------------- next part --------------
A non-text attachment was scrubbed...
Name: trellis-psnr.png
Type: image/png
Size: 4038 bytes
Desc: 
Url : http://edu.bnhof.de/pipermail/xvid-devel/attachments/20030501/60d30a0a/trellis-psnr.png
-------------- next part --------------
A non-text attachment was scrubbed...
Name: trellis-speed.png
Type: image/png
Size: 5835 bytes
Desc: 
Url : http://edu.bnhof.de/pipermail/xvid-devel/attachments/20030501/60d30a0a/trellis-speed.png


More information about the XviD-devel mailing list