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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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