How to measure read noise from image

[astrosatch]

Hi!

There is so many topics relating read noise and adu values so I'd like to know how one measures it from image. I'm using nebulosity 4 and don't know how to see how much of read noise is in the image. I know something about reading mean value from pixel stats, but don't know what am I looking for. Is there calibration first or what?

Thank for reply

Andrej

[kens]

Try this: http://www.qsimaging.com/ccd_noise_your_camera.html

[don4l]

On 12/11/2018 at 09:24, kens said:

Try this: http://www.qsimaging.com/ccd_noise_your_camera.html

I've read those pages, and I am none the wiser!

 

There must be a way of calculating read noise without using Fast Fourier Transforms ( whatever they are) ????

 

 

[sharkmelley]

Try this:

http://www.aicccd.com/archive/aic2008/CCD_stack_calculate_gain_by_stan_moore.pdf

Or this:

http://casa.colorado.edu/~bally/Current_Course/ASTR_3510/Useful_documents/CCD_Gain.pdf

However, there's one complication.  If you are using a one-shot-colour camera or DSLR then it is essential to separate the colour channels and do the calculations on each colour channel independently.

Mark