Re: [hugin-ptx] stitching cylindrical pano from rectilinear images results in vertical mismatch at ends

2019-04-29 Thread Bruno Postle 
A couple of things:

If these input images are cylindrical, Hugin won't detect this automatically, 
you need to set the input projection to cylindrical (in addition to the output 
projection).

Cylindrical images are often cropped, meaning that the horizon doesn't run 
through the middle of the image, in this case you need to optimise the 'e' 
parameter in addition to 'v, r, p & y'. This itself would explain the 
dislocation you are seeing.

How are you extracting the images from the MOV files? Somewhere we have a Hugin 
tool for parsing QTVR data and reassembling a panorama automatically - would 
this be useful?

-- 
Bruno


On 29 April 2019 00:34:44 BST, James Proctor wrote:
>Greetings -- I'm using Hugin to stitch together some old digital images
>
>taken from a Nikon Coolpix atop a tripod/pano mount (14 total per pano). 
>There was plenty of overlap btw all images, including the first and last 
>image. The stitching process seems to work great, but when I export and
>
>view the pano the vertical position of elements at the left and right ends 
>is off, resulting in a jagged transition...see e.g. attached. 
>
>The settings I used are as follows:
>
>   1. Load Images: Lens type rectilinear, 3.8mm/13.7 multiplier 
>   (automatically detected?)
>   2. Projection switched from default Rectilinear to Cylindrical
>3. I've played a bit with Center/Fit/Straighten buttons, but they don't
>
>   seem to do the trick
>
>There must be an easy explanation as to why the stitching process doesn't 
>align the two ends of the pano, given the original images overlap 
>substantially. It just doesn't seem to recognize that these 14 images are 
>from a quasi-cylindrical (vs. e.g. planar) source.
>
>If you could please point me to a ready solution I'd sure appreciate! The 
>app is proving useful for me to re-stitch circa 2000 digital panos 
>previously saved in now-extinct QTVR format.

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Re: [hugin-ptx] stitching cylindrical pano from rectilinear images results in vertical mismatch at ends

2019-04-29 Thread Greg 'groggy' Lehey 
On Sunday, 28 April 2019 at 16:34:44 -0700, James Proctor wrote:
> Greetings -- I'm using Hugin to stitch together some old digital images
> taken from a Nikon Coolpix atop a tripod/pano mount (14 total per pano).
> There was plenty of overlap btw all images, including the first and last
> image. The stitching process seems to work great, but when I export and
> view the pano the vertical position of elements at the left and right ends
> is off, resulting in a jagged transition...see e.g. attached.

My first thought looking at that pano is that the horizon looks as if
it has been bent.  Is the ground really like that?  In particular, the
trees at the left are leaning to the left, but they're coming out of
the ground at 90°.

Do you have vertical control points?  I've found them to be more of a
problem in this kind of pano.  Check in the Assistant tab: uncheck
"Detect vertical lines".

Otherwise if you can put the source images somewhere, we can take a
look at them.

Greg
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Re: [hugin-ptx] stitching cylindrical pano from rectilinear images results in vertical mismatch at ends

2019-04-28 Thread Erik Keever 
Hi Jim,

Offhand possibility...

The 1st and last images overlap but do they have control points between
them? I don't believe the bulk detectors do this by default. If they lack
CP, small alignment errors from N to N+1 will accumulate & make the ends
mismatch.

-- Erik

On Sun, Apr 28, 2019, 10:40 PM James Proctor  wrote:

> Greetings -- I'm using Hugin to stitch together some old digital images
> taken from a Nikon Coolpix atop a tripod/pano mount (14 total per pano).
> There was plenty of overlap btw all images, including the first and last
> image. The stitching process seems to work great, but when I export and
> view the pano the vertical position of elements at the left and right ends
> is off, resulting in a jagged transition...see e.g. attached.
>
> The settings I used are as follows:
>
>1. Load Images: Lens type rectilinear, 3.8mm/13.7 multiplier
>(automatically detected?)
>2. Projection switched from default Rectilinear to Cylindrical
>3. I've played a bit with Center/Fit/Straighten buttons, but they
>don't seem to do the trick
>
> There must be an easy explanation as to why the stitching process doesn't
> align the two ends of the pano, given the original images overlap
> substantially. It just doesn't seem to recognize that these 14 images are
> from a quasi-cylindrical (vs. e.g. planar) source.
>
> If you could please point me to a ready solution I'd sure appreciate! The
> app is proving useful for me to re-stitch circa 2000 digital panos
> previously saved in now-extinct QTVR format.
>
> Regards,
>
> Jim Proctor
>
> --
> A list of frequently asked questions is available at:
> http://wiki.panotools.org/Hugin_FAQ
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> .
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