seeing by Fourier Transform

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george whiston
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Joined: Sat Sep 01, 2018 10:10 am

seeing by Fourier Transform

Post by george whiston » Sat Sep 01, 2018 10:20 am

It seems to me that a good measure of astronomical seeing is by using the Fourier Transform spectrum of the position of a random pixel as a function of time from in a movie - eg amplitude and frequency content - low amplitude good and low frquency good and so-on. I could do this if I could understand the format of an avi-file - ie extract the information and then FT it.

Surely a simple task to someone familiar with avi files ?

Any thoughts ?

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admin
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Re: seeing by Fourier Transform

Post by admin » Sat Sep 01, 2018 10:48 am

Hi,

SharpCap already has a Fourier based focus score tool that measures the strength of the higher spatial frequencies in transform.

If you wanted to write something like this yourself then I'd suggest either finding a library in your favourite programming language to read AVI files (they are very complex - you don't want to write this from scratch) or to work with SER files instead which are much simpler - http://www.grischa-hahn.homepage.t-online.de/astro/ser/

Robin

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