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2023-03-15: APP 2.0.0-beta14 has been released !

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Problem Processing FLI Kepler Images

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(@whixson)
Black Hole
Joined: 4 years ago
Posts: 162
Topic starter  

Looking for help using APP to process data from the FLI KL4040 or KL400. This camera is based on a Scientific CMOS chip and has large amounts of Fixed Pattern Noise. I have been trying to process the subs with APP and getting tons of strange artifacts in the calibrated and integrated images, as well as warning messages about being unable to normalize many of the subs. I'll post a zoom of a calibrated image as well as an integration, will submit links to the FITS files later. Done without Adaptive pedestal, using matching darks and bias-calibrated flats. Images were heavily dithered - note I could process in Pixinsight significantly more successfully, but I love APP and hoping we can figure out whats happening

Please note the AFTER calibration is first and then the BEFORE

AfterCalibration
Before Calibration

 

Integration

Integration

 


   
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(@vincent-mod)
Universe Admin
Joined: 6 years ago
Posts: 5386
 

Hi @whixson those subs do look quite challenging indeed. What kind of processing do you do in PI to get a more succesful result? Could you post a result of that as well? I think it's best if I look at the data and calibration frames to see if I can get it to work. You can upload them to the APP server: server with username and password: appuser
Please create a folder with your name first.

Thanks!


   
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(@whixson)
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Joined: 4 years ago
Posts: 162
Topic starter  

Thanks Vincent!

PI processing was pretty much along the lines in Warren Keller's book. I didn't do any dark scaling though. Lights were calibrated with matched darks, and flats, because they were sky flats of different exposure lengths, with bias master only because it was impractical to have matching darks. I should note I heavily dithered every other exposure. 

I'm attaching the same zoom-in of the raw sub, calibrated, cosmetically corrected subs and the integrated master.  As you can see, although the calibrated sub still had issues, it didn't have the columnar smearing I got with APP. Cosmetic Correction helped a lot, although I see I could have been even more aggressive. The master is where things got better, where I think the dithering helped a lot.

Raw
Calibrated
CosmeticallyCorrected
Integrated

 

I'll post this and then go upload a subset of my files. Thanks again! This is a great camera in many ways, but calibration is a whole new ballgame!

EDIT: Just posted 9 files each Ha lights, matching darks, biases and flats. Note I used 1 second subs as biases based on a recommendation I got from another user. Good luck!!

Wayne 


   
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(@vincent-mod)
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I'll get to it in due time, please allow for up to a few days. 🙂


   
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(@whixson)
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Joined: 4 years ago
Posts: 162
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No problem! Thanks for looking into this. 


   
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(@vincent-mod)
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Joined: 6 years ago
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Ok, what about this one; can't exactly tell what region you have there and I hope the JPG will show enough (right-click and open in a new tab for 100% view). This is right after integration, no extra touch ups.

St avg 1620.0s MSC 2 2.5 5 x 1.0 LZ3 NS full qua add sc BWMV nor AAD RL MBB5 1stLNC it1 St

And a crop;

St avg 1620.0s MSC 2 2.5 5 x 1.0 LZ3 NS full qua add sc BWMV nor AAD RL MBB5 1stLNC it1 mod St

   
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(@whixson)
Black Hole
Joined: 4 years ago
Posts: 162
Topic starter  

Looks amazing Vincent - what were your settings? That's great!


   
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(@vincent-mod)
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Excellent! So I didn't do anything really out of the ordinary, I figured doing things slightly different than you already tried might work, apparently it did straight away. 😉

Screenshot 2019 08 08 at 21.05.57
Screenshot 2019 08 08 at 21.05.43
Screenshot 2019 08 08 at 21.05.17
Screenshot 2019 08 08 at 21.04.58

   
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(@whixson)
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Joined: 4 years ago
Posts: 162
Topic starter  

I notice several things different. I didn’t do dynamic distortion correction or MBB, or the MAD sigma clip. Did you do anything special with darks, flats or biases settings? Scaling? 

I’ll try again with the full data set. Maybr I had too much data 😂 or some bad subs, although I did blink them in PI before processing  

thanks, excited now to try again 

 


   
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(@vincent-mod)
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Joined: 6 years ago
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Nope, nothing special, simply the above settings. You might want to stack like 90% or so based on quality with the bigger dataset. The sigma clipping I did because of the amount of noise it has, it might help a bit but you can experiment on a small sample like this set. The distortion correction I figured might be helpful as your registration looked wrong. MBB on a dataset like this won't have a dramatic effect, just maybe the edges of the integration.


   
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(@whixson)
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Joined: 4 years ago
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Thanks Vincent - I think that made all the difference! I'll post the result


   
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