Re: Lanczos interpolation

Mark Herring wrote:

> On Mon, 24 Nov 2003 12:20:14 -0000, [EMAIL PROTECTED]
> wrote:
>
>
> > I'm trying to find out why a Lanczos window is often used for sinc
> > interpolation of digital images.  Why not some other window, such as a
> > Hamming or Hanning window?  Does the Lanczos window have some magical
> > properties that make it specially suitable for images?
> >
> > Thanks,
> > Andrew.
>
> Wow!!!  I dont know about the other NG, but very few of us in R.P.D.
> have any clue what you are taling about.
>
> To many of us, interpolation is just a sleazy trick by a few fringe
> camera makers to pump up their Mp ratings
> **************************
> Mark Herring, Pasadena, Calif.
> Private e-mail: Just say no to "No".

Interpolation is a useful technique.  I recall using it in math classes 
back before calculators that gave answers to 8 digits.  It made it 
possible to use a 4 place logarithm table and get useful answers to 4 
places, even after multiplying.

The same usefulness applies to photographs.  While interpolation doesn't 
give exactly what a higher resolution sensor would give, it does 
approximate it very well, in most cases.