[XviD-devel] Quantization

Marco Al marco at simplex.nl
Sun Jul 20 17:21:00 CEST 2003


From: "Edouard Gomez" <ed.gomez at free.fr>

> At  least the  LUT idea  seems to  be good  for h263  (the LUT  would be
> something like 2*32*2048*2=256kB

Didnt you say the fixed point multiply by reciprocal approximation was
always correct for DC scaling? If that is true it should almost certainly
also be true for h263 quantization in general, though maybe not for MPEG-4
where the dividers are larger. Why use a bigger LUT to avoid one extra
multiplication?

Marco



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