Undistorted images have black borders

December 31, 2017 12:41

When I save registration, my undistorted images have black borders. Is there a way to prevent those black borders from appearing?

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13 comments

Götz Echtenacher

January 02, 2018 09:06
I've noticed this in other programs as well - would be interesting to know the reason...
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ssh4

January 02, 2018 13:22
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Götz Echtenacher

January 02, 2018 13:47
Thank you Vlad!

I didn't notice that they have been undistorted in RC.

What I meant is that I imported undistorted images from somewhere else (3 guesses !) and they had all one perfectly straight black strip. Can't have been due to the undistortion because otherwise they wouldn't have been perfectly straight (and also exactly the same).
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ssh4

January 02, 2018 13:52
Lens settings estimation can't be perfect. Especially for not expansive lenses used in multicamera rigs.
But this lens can have near zero distortion, so photogrammetry tool just shift principal point.
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Götz Echtenacher

January 02, 2018 15:44
Ah, so that's probably what happened in my case...

But why would RC shift this principal point from a set of images that was already quite well aligned?
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ssh4

January 02, 2018 16:12
For example sensor optical stabilisation - correct reason.
Or false positive feature matches - incorrect.
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Götz Echtenacher

January 02, 2018 17:26
But for all of them absolutely identical?

That doesn't match for either...

Oh well, another mistery... ;-)
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Marcus Milne

January 02, 2018 23:06
No difference for me even when I use "Inner region"
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ssh4

January 03, 2018 04:50
Marcus.

You can play with Resolution settings. And with Enabling/disabling Principal point undistortion.
In case you do not like black borders.

But, will be better understand what problem you want solve? Because this black borders must not used by any other photogrammetry software.
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Götz Echtenacher

January 03, 2018 08:18
Hi Marcus,

did you re-align after you changed the setting?

You might want to delete all components before you continue since RC uses existing ones in the project as a starting off point, which might explain that...

Also, does it affect your result in any negative way? because in theory RC ignores unicolored areas. It is quite possible that the areas are noch black but transparentm at least within RC.

Hi Vlad,

do you mean that one shouldn't use those undistorted images in other software? Or that other software will ignore it as well?
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Marcus Milne

January 03, 2018 23:51
Its the same problem even if I start from a new project.

I'm trying to create texture in another photogrammetry program but because of the black lines, I get lines on the mesh after building the texture. It looks like slash marks
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Marcus Milne

January 04, 2018 00:55
Ok, you are correct that proper photogrammetry software can ignore alpha. I found the setting to enable that and it works now. Thank you!

For anyone else reading this, I'm not jumping ship and leaving Reality Capture. This software is still far superior to anything else out there. I'm just experimenting with texturing
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ssh4

January 04, 2018 01:32
Marcus, that what I want to know.
If you use Bundler export, really big chance that it have a bug. And this is not a problem with border, this is error in values. That affect wrong texture generation in some other well known software. Team working on its fix, but no eta :(
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