Registration on mosaic failure  

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(@elgol)
White Dwarf Customer
Joined: 1 year  ago
Posts: 19
November 13, 2018 13:22  

I am trying to create another mosaic with 135 and 400mm focal lengths alike the one in Mabula's tutorial. Now the first panel of 400mm of the Cirrus Nebula will not register:

2018 11 13 13 15 07 Greenshot
2018 11 13 11 13 20 Greenshot
2018 11 13 11 09 03 Greenshot

I manually set the star sizes and decreased kappa which kept inceasing during star analysis. I changed scale stop till 12. From the screenshots you can tell sufficient stars are analysed, changed pattern recognition... 

Does someone have an idea?

 

greetings,

stefan


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(@vincent-mod)
Neutron Star Moderator
Joined: 1 year  ago
Posts: 177
November 20, 2018 23:54  

If you visually go through the frames, is there anything weird or different about that sub?


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(@elgol)
White Dwarf Customer
Joined: 1 year  ago
Posts: 19
November 22, 2018 08:15  

hi,

no, nothing. I managed to get is stacked when I only selected panels with cirrus nebula in it. the star analysis works fine and even though >2000 stars are analysed regristration fails often. the suggestion to lower kappa there only works manually, since it keeps increasing. 2 of 3 panels containing Cirrus can be stacked, where one is of 135mm the other 400mm. What I see is that the stars have blue colored edges which have not been there before in neither image. 

2018 11 22 08 13 24 Greenshot
2018 11 22 08 12 27 Greenshot


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(@vincent-mod)
Neutron Star Moderator
Joined: 1 year  ago
Posts: 177
November 22, 2018 23:39  

Looks like the registration is not spot on, for the blue channel. Could it be something like field rotation maybe? That might be problematic in some cases. Did you switch on "Distortion Correction" and tell APP the frames are from different optics ?

 

edit: and stacking based on "Quality" might also help if stars vary in size between subs.

This post was modified 3 weeks  ago by Vincent Groenewold - Moderator

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(@elgol)
White Dwarf Customer
Joined: 1 year  ago
Posts: 19
November 23, 2018 12:54  

yes, this I did both. I will retry when having better data than this test where I had wind ...

by the way: since > 1 year I have to prove I am no roboto when logging in. Is there  a chance that this can change?

 

stefan


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