In
sci.space.shuttle,sci.electronics.design,rec.puzzl es,rec.crafts.metalworking,
On Sat, 30 Jul 2005 23:18:39 GMT, " George"
wrote:


"Aubrey McIntosh, Ph.D." wrote in
message ...


George wrote:
""Nick Müller"" wrote in message
...


Hot pixels is a known problem of all CCD cameras during long exposures
(1s and up)
A hot pixel is created by an element with a higher rate of charge
leakage than its neighbors.
On long exposure the leakage may cross the exposed value treshold thus
producing a white dot on the image. BlackFrame NR uses a black-frame
method to remove such noise with preserving all details, so the makers
say. I haven't used this program, although I do have a copy. I have
used black frames many times in astrophotography to remove hot pixels.

Recently, in group s.e.d, there was a link to a site on spatial
filtering. It shows some examples of hot spot removal.

http://www2.polito.it/ricerca/cgvg/teaching/ComputerVision/SpatialFiltering.pdf

Thanks for the link. Always looking for enhancement technics.

For more, check out some of the software and techniques discussed
in sci.astro.amateur where they do a lot of this kind of stuff for
digital astrophotography. I've seen pics from posters there as good as
any in astronomy textbooks.

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