Author Topic: Moon image registration  (Read 4979 times)

Offline Rob Friefeld

  • Newcomer
  • Posts: 34
    • View Profile
Moon image registration
« on: 2015 January 02 13:13:05 »
"Just for fun", I set up on my front balcony and took some moon shots with a DSLR, 24 subs. I'm a bit embarrassed to say that I have no idea how to register the subs in PixInsight. The registration process worked pretty well the first time, with 3 of the 24 subs skewed and twisted afterward. When I tried to do it again, I couldn't get registration to work at all: it reports no stars found. I assume that the process picks up little high lights and considers them to be stars? The integration looked good noise-wise, but was not quite as sharp as any individual sub.

I'm not unhappy with the result, but how do I do this right?

FSQ-106 at f/8, 21 x 1/100th second at ISO 100. No calibration. Registered, integrated. Mild deconvolution, histo stretch, HDMRT, LHE.


Offline Rob Friefeld

  • Newcomer
  • Posts: 34
    • View Profile
Re: Moon image registration
« Reply #1 on: 2015 January 02 13:14:02 »

Online pfile

  • PTeam Member
  • PixInsight Jedi Grand Master
  • ********
  • Posts: 4103
    • View Profile
Re: Moon image registration
« Reply #2 on: 2015 January 02 15:15:31 »
i think yes, lunar image with staralignment is a happy accident. there was a tutorial thread posted here with best settings for StarAlignment to interpret bright parts of the moon as 'stars', but now i can't remember who posted it.

you can also try the script called FFTRegistration which does a more traditional FFT-based planetary-style alignment.

rob

Offline cdesselles

  • PixInsight Addict
  • ***
  • Posts: 164
    • View Profile
Re: Moon image registration
« Reply #3 on: 2015 January 02 18:17:34 »
Try the "HDR Composition" process.  Essentially you'll be making a mosaic of all the images, but since they are all the same they should be overlaying each other.

(I've not done this myself, so if you try it, please report on it so I can see if my guess is correct.)
Celestron CPC1100 - Canon 550D (T2i) and of course, Pixinsight!

Offline Rob Friefeld

  • Newcomer
  • Posts: 34
    • View Profile
Re: Moon image registration
« Reply #4 on: 2015 January 03 13:40:59 »
GradientMergeMosaic did work. The result looks pixel identical to register-integrate, but it was certainly simpler. Thanks!

Offline Rob Friefeld

  • Newcomer
  • Posts: 34
    • View Profile
Re: Moon image registration
« Reply #5 on: 2015 January 04 11:31:40 »
And FFTRegistration also worked very well. Thanks, guys.

Offline MikeOates

  • PixInsight Addict
  • ***
  • Posts: 274
    • View Profile
Re: Moon image registration
« Reply #6 on: 2015 January 05 05:09:31 »
There was a tutorial thread posted here with best settings for StarAlignment to interpret bright parts of the moon as 'stars', but now i can't remember who posted it.

rob

Hi Rob, Was it my post?
http://pixinsight.com/forum/index.php?topic=7214.msg48564#msg48564

Mike

Online pfile

  • PTeam Member
  • PixInsight Jedi Grand Master
  • ********
  • Posts: 4103
    • View Profile
Re: Moon image registration
« Reply #7 on: 2015 January 05 08:41:25 »
yes thank you Mike, i really should bookmark things!!

rob