[APG 2.5B1 OSX] Horizon distorts after each optimization  

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Judy-A
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[APG 2.5B1 OSX] Horizon distorts after each optimization

by Judy-A » Tue Oct 12, 2010 7:16 am

Lens: Samyang 8mm fisheye.
Camera: Nikon D5000 (DX format sensor)

1. Groups: Load 6 landscape images.
2. Detection set to Fisheye (see screenshot)
3. Detect.

Result: Horizon is reasonably straight.

4. In CP editor, remove CPs from clouds.
5. Optimize.

Result: Horizon is severely distorted.

6. Click Automatic Horizon tool

Result: Zenith of sky is now at pano centerpoint!

7. Undo Automatic Horizon
8. Manually straighten pano with Move Images tools.
9. CP Editor: add a few more control points along land/sky margin.
10. Optimize

Result: Horizon is again severely distorted.

This twisting of the horizon is happening in all APG 2.5b1 panos that I have done. It did not happen in APG 2.0.9. In 2.0.9, the horizon generally stayed quite close to where it had been before the latest optimization.

Judy Arndt

APG 2.5.0 Beta 1
Mac Pro Quad Core Intel Xeon
Mac OS 10.6.4
Lens: Samyang 8mm fisheye.
Camera: Nikon D5000 (DX format sensor)



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AlexandreJ
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by AlexandreJ » Tue Oct 12, 2010 8:01 am

Issue 317 opened

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GURL
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by GURL » Tue Oct 12, 2010 11:20 am

This is not a particular behavior of 2.5 beta nor of 2.5 alpha but - as far as I remember - of any previous Autopano versions...
Georges

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Judy-A
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by Judy-A » Wed Oct 13, 2010 2:39 am

GURL wrote:This is not a particular behavior of 2.5 beta nor of 2.5 alpha but - as far as I remember - of any previous Autopano versions...

Georges, that hasn't been my experience. I tested the same images in APG 2.0.9.

Here is the behavior in APG 2.0.9.

1. Groups: Load 6 landscape images.
2. Detection set to Fisheye (see screenshot)
3. Detect.

Result: Horizon is reasonably straight.

4. In CP editor, remove CPs from clouds.
5. Optimize.

Result: Horizon is straighter.

6. CP Editor: add a few more control points along land/sky margin.
7. Optimize

Result: Horizon is very straight.

However, I will agree with you on one point about snapping to zenith.

In APG 2.0.9:
1. I manually pulled the pano out of alignment so it resembled the roller-coaster horizon in the second example the set in my previous post.
2. Clicked on 'automatic horizon'.
Result: The zenith snapped to the center point.

I don't think that part is unexpected behaviour, because the zenith is probably the position closest to the previous horizontal/vertical axis.

Judy

Mac Pro Quad Core Intel Xeon
Mac OS 10.6.4



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GURL
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by GURL » Wed Oct 13, 2010 12:01 pm

My previous post is a bit too short but this matter is not clear:
- sometimes optimization will not move the pano horizon
- sometimes the horizon is improved
- sometimes the horizon is lost.

As a rule, a click on the Automatic horizon is enough to fix the horizon but...

... in 2.5 beta a click on this icon while the CP editor is opened will often (or is it always?) cause APG to enter a very long loop (under Windows/7 APG windows are covered by a "white haze" and a program not responding warning is displayed.) Never the less, after waiting long enough APG will resurrect!

:rolleyes: Ouf!
Georges

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AlexandreJ
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by AlexandreJ » Thu Oct 28, 2010 3:03 pm

I've decided to use automatically the 'Automatic horizon' tool just after any optimization. Should do the trick.

To be checked for feedback in RC.

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Judy-A
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by Judy-A » Thu Oct 28, 2010 6:40 pm

AlexandreJ wrote:I've decided to use automatically the 'Automatic horizon' tool just after any optimization. Should do the trick.

Maybe not.

I hope you'll also look at the reason why the pano center point (or yaw of center image) is not being preserved upon optimization.

Would it be possible to maintain the previous center point? I believe that would help when optimizing my panos.

Judy



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hermer-blr
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by hermer-blr » Fri Oct 29, 2010 8:38 am

I Also noticed as severe degradation on this from 2.0 to 2.5:
- 2.0 : in general the pano was OK - when it was not, I could straighten the horizon and in general it worked
- 2.5 : I never never never got a correct panorama, but systematically a destorted one (like in your second picture above, eventually much worse) - furthermore, the straighten horizon function does not work anymore in 2.5 (any release): it makes things worse - the only remaining solution (and it works) is the vertical line tool !

Note : I do not work with a fisheye but a standard lens (Sigma 10-20, 100° x 70°) and 24 images per pano.
Last edited by hermer-blr on Fri Oct 29, 2010 8:40 am, edited 1 time in total.
Nikon D5100 (formerly Nikon D60) - Sigma 10-20 - 24 shots Panoramas in 3 raws
Windows 32 bits - APG
website htt://jmh.trp.free.fr

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GURL
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by GURL » Sun Oct 31, 2010 11:45 am

hermer-blr wrote:- 2.5 : I never never never got a correct panorama, but systematically a distorted one [..]

Note : I do not work with a fisheye but a standard lens (Sigma 10-20, 100° x 70°) and 24 images per pano.

When using a fisheye it seems to work as usual, like in the following before/after example (2.5 beta 2 - I zoomed and verified that verticals are actually vertical.)




Georges


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