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Question on derotation

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#26 bunyon

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Posted 15 January 2013 - 01:47 PM

Off topic, I think, but I've yet to stack using any drizzle and get any kind of usable image.

#27 Mert

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Posted 15 January 2013 - 03:38 PM

Anxious to see what you come up with Steve.
I am still busy to try to see any difference between
the image done with AS!2 and Registax, or the video
cut in 3 and passed through AS!2 then WinJupos to
derotate.
I don't seem to get any better result eventhough there is
quit a lot of rotation within the same 3 minute lenght
avi, as you can see in the animated gif at pg. 1 of
this thread!
It looks like AS!2 does a terrific job and takes in account
for rotation??
Hope Emil chimes in on this!
On the bandings, these videos were captured in SER
format without any debayering, then fed through PIPP to
convert to avi, the debayering takes place in AS!2.
When fed directly into AS!2 the outcoming results seems
to be in parts or with bands ( like a distorted view )

#28 MvZ

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Posted 15 January 2013 - 04:55 PM

Mert, AS!2 tracks features, and thus it should be able to compensate for small changes caused by the rotation of a planet. But near the edges it is going to have a problem (because where the edges remain perfectly steady, the features on Jupiter will move). But 2 maybe 3 minutes likely won't give you any problems.

#29 RedLionNJ

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Posted 15 January 2013 - 05:30 PM

Took the same data of Mert's and was able to get a nice stack (50%) with 1.5x drizzle...

Paul - in really good seeing (which I get annually and Mert seems to have experienced here), a 1.5x drizzle works for me.

Grant

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#30 Mert

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Posted 16 January 2013 - 01:41 PM

Nice processing Grant, did you derotate the image/s
in Winjupos or straight through AS!2 and Registax,
or something more?? :waytogo:

#31 Mert

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Posted 16 January 2013 - 06:41 PM

Hi Steve,

I did a drizzle of 1.5x and lateron rescaled to 75%
of the size.
Maybe a bit hard processed but I'm quit happy with
it.
If I try to derotate with Winjupos, wether I cut in 2,
3 or more parts, I can't get better results then just
with AS!2 straight away, great software ( thanks Emil!! )
Oh by the way, this image is from the second avi!

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#32 RedLionNJ

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Posted 16 January 2013 - 08:22 PM

Nice processing Grant, did you derotate the image/s
in Winjupos or straight through AS!2 and Registax,
or something more?? :waytogo:


No derotation, Mert. Just a stack in AS!2, a small stretch and sharpening in R6 and some minor deconvolution, noise reduction and sharpening in GiMP.

Grant






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