[AstroPy] normalizing pictures from camera at various settings

Eyal Saiet ejsaiet at alaska.edu
Wed Dec 9 02:13:06 EST 2015


Hello colleagues,
I did not get any replies to my question. One idea that stroke me was to
assume the brightens of stars is constant and use its DN value to normalize
my images? I need to dig more into this, but thought maybe someone would
have feedback?

On Fri, Dec 4, 2015 at 12:42 PM, Eyal Saiet <ejsaiet at alaska.edu> wrote:

> Hello,
> I am taking an image processing class. My class project involves working
> with given camera images of the night sky. Because the camera is set at at
> auto, I cannot compare intensity of two images(camera sensitivity varies
> due to changes in shutter speed, aperture, and ISO). Is there any algorithm
> you would recommend that can infer what the dark night sky should look like
> in the histogram, and use that information to adjust the histogram,
> therefore enabling me to compare  two image DN values, from different
> camera settings?
>
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