Re: [hugin-ptx] strange issues with 360 pano?

[David W. Jones]

On August 13, 2018 9:39:34 PM HST, Greg 'groggy' Lehey  
wrote:
>On Monday, 13 August 2018 at 22:04:50 -0700, clepsydrae wrote:
>>
>> Here's what I've gotten to
>>  now that I'm
>not
>> optimizing translation. Very happy with the results. Just need to
>> understand why translation optimization confused it so much... maybe
>the CP
>> detection on dark images, as you suggested?
>
>Certainly doing just the dark images doesn't help.  But I'm probably
>out of my depth here.  Maybe others can venture an opinion at to what
>optimization parameters make sense.

I would use the exposures closest to a 'normal' exposure for finding CPs and 
aligning images. Just to avoid issues that might be traceable to severe 
over/underexposure.


David W. Jones
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Re: [hugin-ptx] strange issues with 360 pano?

[clepsydrae]

Aha, sounds like that 2010 post was indeed my issue: 
https://wiki.panotools.org/Hugin_FAQ#Why_does_my_output_covers_only_180.C2.B0.3F

"Always read the FAQ!" :-)

Upshot, as I understand it: if optimizing for translation, the pano must be 
less than 180 degrees HFOV.

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Re: [hugin-ptx] strange issues with 360 pano?

[clepsydrae]

> Certainly doing just the dark images doesn't help.  But I'm probably 
> out of my depth here.  Maybe others can venture an opinion at to what 
> optimization parameters make sense.
>

It seems to find CPs just fine, judging by inspection of points, and given 
that the optimization works great (when translation is not optimized)... 
I've used cpfind to find good points in images much darker than these, too, 
and it seemed fine? (Also, these are 16bit tiffs, so there's possibly more 
room at the bottom of the range to work with, even if the camera doesn't 
really use all those bits.)

Doing some more googling, it seems that I was unwise to use translation 
optimization, as it's for cases where the tripod is really moved (e.g. 
capturing the nadir of a spherical 360 pano or other cases where the tripod 
is e.g. picked up and moved). I thought it was OK for small movements as 
well (e.g. non-calibrated non-pano-head tripod)... must have read that 
wrong somewhere.

This post  
seems to talk about something similar, but it's from 2010 so I'm not sure I 
should pay much attention to it...

Thanks for the scripting/HDR tips. I haven't found an automatic HDR program 
that can match what one can do with manual blending (using luminosity 
masks), but I was planning to try letting hugin make the HDR attempt, and 
assuming it doesn't satisfy, was going to align/pano everything in hugin, 
export each HDR layer separately, and then blend in GIMP. Someday I will 
get around pano stuff on the command line. Now that I'm finally learning 
how to use hugin properly, though, I like it a lot. :-)

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Re: [hugin-ptx] strange issues with 360 pano?

[Greg 'groggy' Lehey]

On Monday, 13 August 2018 at 22:04:50 -0700, clepsydrae wrote:
>
> Here's what I've gotten to
>  now that I'm not
> optimizing translation. Very happy with the results. Just need to
> understand why translation optimization confused it so much... maybe the CP
> detection on dark images, as you suggested?

Certainly doing just the dark images doesn't help.  But I'm probably
out of my depth here.  Maybe others can venture an opinion at to what
optimization parameters make sense.

I do my panos a bit differently:

1.  Take 3 images bracketed 3 EV apart, skewed about 1.3 EV towards
overexposure (+4.3 EV, +1.3 EV, -1.7 EV).  I think this would work
well for your scene as well.

2.  Convert images to HDR externally to Hugin (specifically,
Photomatix on a Microsoft box).  Hugin doesn't handle ghosting.

3.  Run the resultant images through Hugin.  Until proof of the
contrary, use the Align function of the Assistant.  This is what I
did with your images.

Recently I've been playing with scripting the conversions, so in
fact what I do is:

pto_gen -o my-1 $FILES
cpfind -o my-2 my-1
celeste_standalone -i my-2 -o my-3
cpclean -o my-4 my-3
autooptimiser  -a -l -s -o my-5 my-4
pano_modify -o $PTO --center --straighten --canvas=AUTO --crop=AUTO my-5

The my-? are intermediate steps in the project file so that I can
see what has changed; the documentation is minimal and out of
date.

Greg
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Re: [hugin-ptx] Re: strange issues with 360 pano?

[Greg 'groggy' Lehey]

On Monday, 13 August 2018 at 21:50:18 -0700, clepsydrae wrote:
> Aha -- it seems to be related to optimization of translation... I inspected
> the .pto and saw some extreme-seeming values for TrX, TrY, and TrZ. I
> started over and did not optimize translation and the issue doesn't happen.

Possibly.  I'd attend to the other issues first.  I'm surprised that
the control point detectors found anything on the original images.

Greg
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