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RE: filmscanners: Minolta DiMAGE Scan & Dimage 7 camera
At 07:43 AM 6/30/01 -0600, Frank Nichols wrote:
>I wonder if it would be posisble to create a "randomized" pattern of sensors
>on a CCD/CMOS chip?
This flies in the face of all known sampling theory!
I suspect that the optical system in most scanners provides
more than enough filtering to limit or eliminate aliasing.
The optical equivalent of lowpass filtering would be a
diffuser. I'm not aware that any scanner manufacturer
uses an optical diffuser in front of the CCD!
I also don't really believe in film-grain aliasing --
film grain is essentially non-periodic, or, more
accurately "white noise" -- ie, containing
an even distribution of frequency elements from
DC to infinity.
rafe b.
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