Nokia 6.1

[Drew Faber]

Does someone have a Nokia 6.1 Lens Project File -- Hugin lens data file?

Thanks!

[David W. Jones]

Hmm. I have a Nokia 6 and I've made a few panormas in Hugin using pictures from it. What would a Hugia lens data file be?

On March 7, 2022 8:06:42 PM HST, Drew Faber <comp...@gmail.com> wrote:

Does someone have a Nokia 6.1 Lens Project File -- Hugin lens data file?

Thanks!

--
David W. Jones
gnome...@gmail.com
exploring the landscape of god
http://dancingtreefrog.com

Sent from my Android device with F/LOSS K-9 Mail.

[Drew Faber]

It's the file created by the Hugin Lens Calibration (GUI) tool that tells Hugin Panorama Stitcher how to bend the images before trying to align them. (I think that's how it goes.)

[David W. Jones]

Hmm. I've never calibrated any of my lenses. Panoramas seem to work
fine, including ones from the current phone, also my tablet, and even
our previous non-smart cheapy phones.

What does calibration offer?

On 3/8/22 04:58, Drew Faber wrote:
> It's the file created by the Hugin Lens Calibration (GUI) tool that
> tells Hugin Panorama Stitcher how to bend the images before trying to
> align them. (I think that's how it goes.)
>
> On Tuesday, March 8, 2022 at 1:35:53 AM UTC-8 GnomeNomad wrote:
>
> Hmm. I have a Nokia 6 and I've made a few panormas in Hugin using
> pictures from it. What would a Hugia lens data file be?
>
>
> On March 7, 2022 8:06:42 PM HST, Drew Faber <comp...@gmail.com> wrote:
>
> Does someone have a Nokia 6.1 Lens Project File -- Hugin lens
> data file?
> Thanks!


--
David W. Jones
gnome...@gmail.com

wandering the landscape of god
http://dancingtreefrog.com
My password is the last 8 digits of π.

[Drew Faber]

I am not an expert. I hope an expert answers your question.
Here is my guess as to, “What does calibration offer?”
I think calibration identifies the corrective factors needed to remove or minimize pincushion/barrel and perspective distortion.
I’m guessing that Hugin can produce a better panorama when it can correct each image for these distortions before assembly.
Again, I am not an expert. These are my best guesses. I hope an expert will answer.

[johnfi...@gmail.com]

On Wednesday, March 9, 2022 at 11:17:29 AM UTC-5 comp...@gmail.com wrote:

Here is my guess as to, “What does calibration offer?”
I think calibration identifies the corrective factors needed to remove or minimize pincushion/barrel and perspective distortion.
I’m guessing that Hugin can produce a better panorama when it can correct each image for these distortions before assembly.

I think the relevant comparison is between correcting those via inclusion in optimization vs. correcting them via lens data in the database.  Comparing against not correcting at all for the lens doesn't answer the right question.

I expect optimization is faster if the lens correction is given in advance, rather than computed by optimization.

If CP's nearer the corners were automatically generated (rather than manually selected) I would expect the lens db method could give better results, because the optimization will be finding slightly wrong values for lens correction that fit the CPs themselves better than the areas around them.  I expect that (for the same reason) using precomputed lens data could be worse when the user has selected CPs to improve important features of the image.

All that assumes the lens db values are computed with more/and better examples than are used for ordinary panoramas.

Again, I am not an expert. These are my best guesses. I hope an expert will answer.

I'm not either.   I haven't actually ever tried setting up a lens db.  I always include the lens correction (at least b) in optimization(usually a later round of optimization after getting yaw, pitch, roll decently approximated).

So my real point here is on what should be compared to answer the question.  My guesses at the impact you would see are based on logic, not experience.