Weird shape image a...
 
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Weird shape image after integration completed  

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(@petercpc)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 41
January 31, 2019 12:28  

I imaged Orion last night using my Canon 1200d with EF 50mm STM lens.

The calibrated images look ok individually but I ended up with this final image. I have never come across this before. Anyone know what is going on here?

Peter

St avg 2500.0s SC 2 3.1 5 x 1.0 LZ3 NS full eq add sc BWMV nor AAD ER MBB10 2ndLNC it3 St

This topic was modified 3 months ago by Peter

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(@petercpc)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 41
January 31, 2019 15:27  

Just to add that I put all the calibrated images in DSS and it resulted in a rectangular integrated image. So, something is going on in APP.

Peter


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(@vincent-mod)
Black Hole Moderator
Joined: 2 years ago
Posts: 303
January 31, 2019 20:48  

Looks like the stars are registered correctly, so to me it looks more like it did a distortion correction (which would make some sense given you use a normal lens). Not sure though this looks good then, could you post a crop without the edges to see if the image actually looks ok? Did you have "dynamic distortion correction" on?

This post was modified 3 months ago 2 times by Vincent Groenewold - Moderator

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(@petercpc)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 41
February 1, 2019 08:55  
Posted by: Vincent Groenewold - Moderator

Looks like the stars are registered correctly, so to me it looks more like it did a distortion correction (which would make some sense given you use a normal lens). Not sure though this looks good then, could you post a crop without the edges to see if the image actually looks ok? Did you have "dynamic distortion correction" on?

Thanks Vincent. Yes DDC was on. I processed this exactly as I normally process an image through a scope.

Peter

Optimized St avg 2500.0s SC 2 3.1 5 x 1.0 LZ3 NS full eq add sc BWMV nor AAD ER MBB10 2ndLNC it3 StCrop


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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2080
February 9, 2019 18:03  

Hi Peter @petercpc and Vincent @vincent-mod,

Indeed the weird shape is the result of having distortion correction enabled on data where it is not needed. It's a bug and I have been working to get this fixed in the next release 😉

In the next version, APP will be able to automatically decide if distortion correction is needed.

Technically, optical distortion correction is the correction of the geometry difference of the data compared to a perfect rectilinear projection. Something normal objectives and all amateur telescopes will try to do, i.e. try to project the data rectilinear.

APP can calculate accurate correction models if the images have a large translation, rotation or scale difference between them. In this case where the bug happens, these differences are too small and when distortion correction is enabled in that case, we get a mathematical problem that distorts the result.

The bug should be gone in APP 1.072 😉

Kind regards,

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


rcfmitch liked
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(@petercpc)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 41
February 10, 2019 09:23  

Thanks Mabula. Good to know.

Peter


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(@rcfmitch)
Main Sequence Star Customer
Joined: 7 months ago
Posts: 30
February 10, 2019 23:46  

Vincent, i gt the exact same thing happen to me on M45 . it looked like a 1960 TV , rounded bottom/top.

whats  going on here ?  Ok Mabula is working on it on the next release!  Koool.

M45 final

 

This post was modified 2 months ago by rcfmitch

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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2080
February 11, 2019 17:09  

Hi @rcfmitch,

Indeed the weird shape is the result of having distortion correction enabled on data where it is not needed. It's a bug and I have been working to get this fixed in the next release 😉

Simply disable distortion correction in 4) and all should be fine 😉 , it should not happen again in APP 1.072 !

Mabula

Main developer of Astro Pixel Processor and owner of Aries Productions


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(@rcfmitch)
Main Sequence Star Customer
Joined: 7 months ago
Posts: 30
February 11, 2019 18:13  

Thank you sir. U dah man!

😉

 


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