Using FFT to remove Newton Rings in solar image?

Image processing, astrometry, photometry, etc.
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merlin66
Posts: 17
Joined: 08 Jan 2019, 05:38

Using FFT to remove Newton Rings in solar image?

Post by merlin66 » 25 Apr 2020, 00:46

Fabio,
Unfortunately with my camera/ barlow combo I get NR in my solar images.
Usually I tilt the camera to reduce them..
I saw the FFT function and according to the manual it could/ should help remove these NR.
When I try the FFT, the FFT screen generated doesn't show the NR (in the example in the manual they are clearer..)
On the assumption we can get a FFT image - how exactly do you use the pixel correction to remove them??
The attached image is a jpeg reduction of a 2.7Mb fits image....
Attachments
Sun_104943_FFT_red.jpg

fabdev
Posts: 230
Joined: 03 Dec 2018, 21:43

Re: Using FFT to remove Newton Rings in solar image?

Post by fabdev » 25 Apr 2020, 12:11

Hello, the FFT can detect and correct a pattern only if it's present on the whole image, but here unfortunately it's present only on a side of the sun.
I cannot imagine any automatic processing which could correct something like that..

merlin66
Posts: 17
Joined: 08 Jan 2019, 05:38

Re: Using FFT to remove Newton Rings in solar image?

Post by merlin66 » 26 Apr 2020, 01:45

Fabio,
Bumma!
Worth asking the question though......

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