At 21:23 25.06.2003, Moose wrote:
The E-1 includes dark frame noise reduction. It takes one exposure of the
subject and then an equal length exposure of a dark frame to get the info
for the noise reduction algorithm.
As should every modern DC, as a minimum. It's a crude but effective method
to reduce a certain type of noise - if you can afford to wait for a second
shot. It has also been done semi-manually with dedicated software in
astrophotography, years before consumer DCs.
Several DCs have now done away with dark frames and instead rely on
on-the-fly signal processing. My initial guess would be that they take
advantage of the fact that diffraction spots are larger than a single
pixel, so they can simply pick out the pixels that stand out too much from
the surroundings and assign them a new value from nearby pixels.
Back to lurking now. I must have set a new personal record in posts/day and
I'm not even shure why I got involved in this discussion.
thOMas
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