Klaas Decanniere wrote:
>
> Hello,
>
>
> I am trying to make night shots with a ccd camera.
> The maximum exposure time that can be set on the camera is 750 ms, which
> is of course too short.
>
> Assuming the noise is random and the object I want to see does not move,
> I should be able to improve signal-to-noise by taking the same shot
> several times and adding all the images together
Using what I learned about CD error correction from
http://www.xiph.org/paranoia/
I can see 3 approaches. both involve using 3 or more shots. the more the
better. for each pix:
1. look for the most occurring value. use that value, discard the rest. 2, 5,
5, 5, - use 5.
2. Given that there may be slight deviations even when there isn't noise, sort
the values, use the middle value. 10, 200, 201, 202, 205 - use 201.
3. looking at #2, if you can figure out that 10 is too far off and must be
noise, then take the average of the remaining 202
Hmm, I bet this is a previously solved problem.
Carl K
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