Weird shape image a...
 
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The problem with the data upload limit for attachments has been fixed. I have restored it to 30MegaBytes. A recent forum software upgrade was responsible for the changed limit. Please accept my apologies for missing this when upgrading the forum sofware, Mabula.

Weird shape image after integration completed  

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(@petercpc)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 41
31/01/2019 12:28 pm  

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 7 months ago by Peter

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(@petercpc)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 41
31/01/2019 3:27 pm  

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)
Galaxy Moderator
Joined: 2 years ago
Posts: 568
31/01/2019 8:48 pm  

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 7 months ago 2 times by Vincent Groenewold - Moderator

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(@petercpc)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 41
01/02/2019 8:55 am  
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: 2111
09/02/2019 6:03 pm  

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


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(@petercpc)
Main Sequence Star Customer
Joined: 2 years ago
Posts: 41
10/02/2019 9:23 am  

Thanks Mabula. Good to know.

Peter


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(@rcfmitch)
Red Giant Customer
Joined: 11 months ago
Posts: 57
10/02/2019 11:46 pm  

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 6 months ago by rcfmitch

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(@mabula-admin)
Quasar Admin
Joined: 2 years ago
Posts: 2111
11/02/2019 5:09 pm  

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)
Red Giant Customer
Joined: 11 months ago
Posts: 57
11/02/2019 6:13 pm  

Thank you sir. U dah man!

😉

 


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