Hi Matto,
I haven't had a chance to look at the code so I don't know how wide the
H-scaling filter can be. However, if you can do it a Lanczos kernel or
windowed sinc at 7 or 9 taps width is generally what is used professionally
(resources permitting).
V-scalers are usually narrower as video signals is not necessarily
band-limited in the vertical axis so a wide impulse response tends to produce
visible ringing in the vertical.
cheers,
Andrew
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