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Weird stacking with autostakkkert, but not sure why

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#1 LtChestnut

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Posted 01 April 2020 - 01:13 AM

Just got a new asi 120mc-s, and tried to get a lunar shot last night with my 6inch dob. At 1200mm focal its too zoomed in so if i want to capture a full disk I need to create a mosaic in photoshop. What is the best way to do this?

 

Last night I tried to let the moon drift across the screen 3 times, with the plan being to stack each video and then align the 3 images in photoshop. If youre confused what I mean, this is the start vs end of the 3rd video https://i.imgur.com/iNjerg3.png and https://i.imgur.com/tc4L8hH.png.

 

That worked for the first 2 videos but not the 3rd. And for the 2 first videos, there were some stacking artefacts that looked really nasty with sharpening.

 

Video 1 stack = https://i.imgur.com/12XMAtt.png

 

Video 2 stack = https://i.imgur.com/gSY4jiz.png

 

Thos ones stacked fine, but when I went to stack the 3rd I kept getting really bad miss stacks. like this https://i.imgur.com/TkusPLY.png No matter what settings I tried I always got bad stacks with 3, and the patterns were consistent. Out of curiosity, I 'stacked' (select 1 frame in autostakkert) the first frame to see if it had corrupted and this was the result https://i.imgur.com/A9nWrdg.png

After seeing that I then rejected the first 10 frames but still had the same error. And then after that I went a cut the first 10s of the video off but that also had the same problem. The only thing that seemed to change how good the stacking was, was making less APs and making them larger. This final image was done with 2 APs https://i.imgur.com/gMDlEHX.png

I had a look through that video and couldn't find any massive jumps/corrupted frames. Running through PIPP doesn't work because it crops and registax just gives a worse result.

If anyone has any ideas what happened with that 3rd video and how I can avoid it, that would be greatly appreciated. If there is a better way to do this sort of imaging, please tell me! I would also like to be able to remove the stacking artifacts in 1 and 2.



#2 Tapio

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Posted 01 April 2020 - 01:42 AM

I think it's better to make individual videos of the mosaic than letting target drift.

#3 Tulloch

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Posted 01 April 2020 - 01:51 AM

Hmmm, try using PIPP to convert the tracking video to a centred video, then use AS!3 to stack the image...

 

Not sure if it will work, but PIPP does a good job on other videos.

 

Andrew



#4 james7ca

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Posted 01 April 2020 - 01:52 AM

IME, AutoStakkert! doesn't do that great of a job when you have a large amount of drift during the capture sequence. It just can't align the images when the drift is above a certain limit. Looking at your examples I don't think you will have much luck in aligning and processing that 3rd video (way too much drift between the start and end).

 

That said, you might be able to find a different set of alignment options that would do a better job and some times PIPP can handle sequences that fail in Autostakkert!.

 

In any case, when (or if) you ever get a good set of images to create a moon mosaic you'll probably have better luck with Microsoft's free ICE application than you will with Photoshop (in combining images into a mosaic).



#5 LtChestnut

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Posted 01 April 2020 - 02:27 AM

IME, AutoStakkert! doesn't do that great of a job when you have a large amount of drift during the capture sequence. It just can't align the images when the drift is above a certain limit. Looking at your examples I don't think you will have much luck in aligning and processing that 3rd video (way too much drift between the start and end).

 

That said, you might be able to find a different set of alignment options that would do a better job and some times PIPP can handle sequences that fail in Autostakkert!.

 

In any case, when (or if) you ever get a good set of images to create a moon mosaic you'll probably have better luck with Microsoft's free ICE application than you will with Photoshop (in combining images into a mosaic).

Heard good things about ICE, will have to have a go. Weird thing is that for 2 and 1 I did the exact same thing, and it stacked 'okay', which is why im confused. 

 

Hmmm, try using PIPP to convert the tracking video to a centred video, then use AS!3 to stack the image...

 

Not sure if it will work, but PIPP does a good job on other videos.

 

Andrew

When PIPP centers the video, it crops it which makes it kinda useless for my aplication becuase I would have to take a LOT of videos to get a decent amount of frames in any given area 




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