Re: Lanczos interpolation

In sci.image.processing Dave Martindale <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] writes:

> I'd guess that Hamming and Hanning windows of the same width as a
> particular Lanczos window would probably work quite well.

I found this:

http://www.cg.tuwien.ac.at/research/vis/vismed/Windows/MasteringWindows.pdf

Looking at the frequency response curves, Lanczos seems to be well
behaved.  However, the response of the Hamming window is very similar
so I imagine it'd be hard to tell the difference in most cases.
Still, I guess one might as well use Lanczos as it's no more expensive
to compute.

"Turkowski [16] used windowed sinc functions for image resampling. He
found the Lanczos window superior in terms of reduction of aliasing,
sharpness, and minimal ringing as conclusion of an empirical
experiment.

"[16] Turkowski. Filters for common resampling tasks. In Andrew
S. Glassner, editor, Graphics Gems I, pages 147{165. Academic Press,
1990."

So, I guess that's the answer.

Andrew.