Aubrey McIntosh, Ph.D. wrote:



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


That was interesting. I do some of that transforming pictures through scanners
into an outline of certain for conversion in my Plasma software. So much to learn
on graphic translation.

Martin

--
Martin Eastburn
@ home at Lion's Lair with our computer lionslair at consolidated dot net
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder

----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==----
http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups
----= East and West-Coast Server Farms - Total Privacy via Encryption =----