Re: Noise.
The noise is usually created by optical trickery inside the CCD, usually
attributed to the design and lithography quality of chip. As the process
becomes smaller and more precise, the quality of the itty-bitty photodiodes
should increase as well.
If you could fab a 10mp sensor on a die of X size, theoretically you should
be able to fab an ultra-accurate 8mp sensor at the same size. The resolution
of your masks/maps/etc is just dedicated to making a more perfect diode
instead of a smaller diode.
The more I think about it, the more unique this problem is to digital
optics. When we were doing preliminary gallium-arsinide lithography
experiments at GT, we had some issues getting the xistors to come up pretty
under a microscope, but we really didn't care because it's either an ON or
an OFF value. (rise/fall times not withstanding). The photodiode is
reporting an intensity, so it's physical construction becomes much more
important to the accuracy of the results. Interesting, never really thought
about it that way...
Still waiting for the OM-5, full digital in an OM-4 chassis...
I am a cadence whore,
Evan
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx]On
Behalf Of Moose
Sent: Saturday, April 17, 2004 4:16 AM
To: olympus@xxxxxxxxxx
Subject: [OM] Re: OT: Digi, Large 22M CCD's
Welcome Evan, especially with your knowledge to share. All that you say
makes sense, but doesn't address the biggest issue in curent sensors,
noise. In today's sensors, decreased photosite size means higher noise.
All the new 8mp prosumer cameras (Oly 8050, S*ny 728, Min*lta A2, etc.)
use an 8mp sensor the same size as the 5mp sensors of their predecessors
and have noise problems.
Moose
The olympus mailinglist olympus@xxxxxxxxxx
To unsubscribe: mailto:olympus-request@xxxxxxxxxx?subject=unsubscribe
To contact the list admins: mailto:olympusadmin@xxxxxxxxxx?subject="Olympus
List Problem"
|