[XviD-devel] halfpel and maybe quarterpel interpolation questions

Christoph Lampert xvid-devel@xvid.org
Sat, 11 Jan 2003 12:27:00 +0100 (CET)


On Fri, 10 Jan 2003, Marco "elcabesa" Belli wrote:

> hi
> another time i'm here to disturb you, sorry=)
> 
> i have some question, i'm looking at image_interpolation function and i see 
> that when it's called for halfpel interpolation, it make new pixels simply 
> using a linear interpolation.
> i don't know if i'm right.. but using a FIR bigger than the one used for 
> linear interpolation won't make it work better?

We can't decide on these things ourselves, it's the MPEG-4 standard that
demands linear interpolation for halfpel-resolution. Btw. for Quarterpel
there is some FIR, also fixed by the standard.


gruel