RE: Digicam

["gary" <gsellani@xxxxxxxxxxxxx>]

Those familiar with audio sampled data systems know that the sample time is
infinitely small. Equating this to imaging, the pixel should not have size,
but rather a sample density.

Going back to the audio analogy, if you take the  sample impulses and play
them back on a DAC making staircase waveforms, the high frequency response
will be incorrect. The nature of the staircase implies a sinc filter was
used, so the playback must incorporate an inverse sinc filter. Since the
image sampling is not infinitely small, I wonder if the use of an unsharp
mask is analogous to the inverse sinc filter.

I think from an archival viewpoint, if you could digitize the grain, you
would. There is always some post processing program that could use the
information. However, you would probably only use such extreme measures for
the Zapruder film and such.

> -----Original Message-----
> From: owner-scan@leben.com [mailto:owner-scan@leben.com]On Behalf Of
> Wire Moore
> Sent: Monday, June 10, 2002 2:39 PM
> To: scan@leben.com
> Subject: Re: Digicam
>
>
>
> This reminds of a certain discussion about 'pixels'; what are
> they? Do they
> have an extent? etc... :)
>

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