[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
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