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## Big sky / blank wall problem...

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• If you shoot a sequence that has some images with nothing but sky or blank wall, what do you do to stitch? I have only a moderately short lens. About 15mm
Message 1 of 9 , Feb 2, 2009
If you shoot a sequence that has some images with nothing but sky or
blank wall, what do you do to stitch?

I have only a moderately short lens. About 15mm equiv. I shoot
3 rows 8 around -- 50,0,-50 and get an adequate sequence with
sufficient overlap.

But certain images can be all sky or blank wall. No usable features
to use for CP generation -- even by hand.

What do you do when you get a situation like that?

Can you tell PTGui to use the lens parameters from a template or analysis
of the other images in the set? And then tell PTGui to use the yaw, tilt,
roll parameters to fake a stitch on those images?

I did a sequence a while ago where I was in a meadow and two or three of the top
shots had no discernible features. I just threw random CP in there and said go.
It worked ok because there was no way to see the stitching errors.

But I would like to figure out a more solid or rigorous method for stitching
image sets with featureless images.
• ... Yes, you can input individual y/t/r params for each of these types of images. You can use the numbers from neighboring images to help you calculate this.
Message 2 of 9 , Feb 2, 2009
--- In PanoToolsNG@yahoogroups.com, Ken Warner <kwarner000@...> wrote:

> Can you tell PTGui to use the lens parameters from a template or analysis
> of the other images in the set? And then tell PTGui to use the yaw, tilt,
> roll parameters to fake a stitch on those images?

Yes, you can input individual y/t/r params for each of these types of images. You can use the
numbers from neighboring images to help you calculate this. Then render it as usual.
• ... Ken, Yes. Use File- Apply Template, and navigate to a project file from a similar shoot that has been successfully stitched. Alternatively, make use of
Message 3 of 9 , Feb 3, 2009
--- In PanoToolsNG@yahoogroups.com, Ken Warner <kwarner000@...> wrote:
>
> Can you tell PTGui to use the lens parameters from a template

Ken, Yes. Use File->Apply Template, and navigate to a project file
from a similar shoot that has been successfully stitched.
Alternatively, make use of the fact that (assuming you are using a
panohead with detents): all the images in a row will have the same
pitch and the same roll, and all the images in a column will have the
same yaw.

John
• Yes, I ve got an NN3. So the yaw, pitch, roll params are easy to set. So then by using the template and the y/p/r params, I don t need to set any control
Message 4 of 9 , Feb 3, 2009
Yes, I've got an NN3. So the yaw, pitch, roll params are
easy to set.

So then by using the template and the y/p/r params, I don't
need to set any control points in the featureless images?

That sounds too easy :-)

John Houghton wrote:
> --- In PanoToolsNG@yahoogroups.com, Ken Warner <kwarner000@...> wrote:
>
>>Can you tell PTGui to use the lens parameters from a template
>
>
> Ken, Yes. Use File->Apply Template, and navigate to a project file
> from a similar shoot that has been successfully stitched.
> Alternatively, make use of the fact that (assuming you are using a
> panohead with detents): all the images in a row will have the same
> pitch and the same roll, and all the images in a column will have the
> same yaw.
>
> John
>
>
• Or you can just drag them into place in the editor window. Matt
Message 5 of 9 , Feb 3, 2009
Or you can just drag them into place in the editor window.

Matt

On 3 Feb 2009, at 12:50, Ken Warner wrote:

> Yes, I've got an NN3. So the yaw, pitch, roll params are
> easy to set.
>
> So then by using the template and the y/p/r params, I don't
> need to set any control points in the featureless images?
>
> That sounds too easy :-)
>
> John Houghton wrote:
> > --- In PanoToolsNG@yahoogroups.com, Ken Warner <kwarner000@...>
> wrote:
> >
> >>Can you tell PTGui to use the lens parameters from a template
> >
> >
> > Ken, Yes. Use File->Apply Template, and navigate to a project file
> > from a similar shoot that has been successfully stitched.
> > Alternatively, make use of the fact that (assuming you are using a
> > panohead with detents): all the images in a row will have the same
> > pitch and the same roll, and all the images in a column will have
> the
> > same yaw.
> >
> > John
> >
> >
• ... Ken, That s right. Note that you can still level the panorama using t1/t2 points and the levelling feature on the Edit menu of the Panorama Editor. That
Message 6 of 9 , Feb 3, 2009
--- In PanoToolsNG@yahoogroups.com, Ken Warner <kwarner000@...> wrote:
>

> So then by using the template and the y/p/r params, I don't
> need to set any control points in the featureless images?

Ken, That's right. Note that you can still level the panorama using
t1/t2 points and the levelling feature on the Edit menu of the Panorama
Editor. That will shift the entire panorama into the correct position,
whereas using the optimizer would shift only those images connected by
control points, i.e. not the featureless images.

John
• Hi John, I made a template and applied it to a big sky pano. Came out ok for me. Wasn t too hard. I applied the template and then made some control points
Message 7 of 9 , Feb 6, 2009
Hi John,

I made a template and applied it to a big sky pano. Came out ok
for me. Wasn't too hard. I applied the template and then made
some control points in images that had obvious features and let
the sky images just sort of float. Seemed to work ok.

Here's a .4meg version in my notorious Java viewer and here's a link to
the equirect.

http://pancyl.com/Scotty2.htm
http://pancyl.com/images/Scotty2.jpg

Thanks for the help...

Ken

John Houghton wrote:
> --- In PanoToolsNG@yahoogroups.com, Ken Warner <kwarner000@...> wrote:
>
>>Can you tell PTGui to use the lens parameters from a template
>
>
> Ken, Yes. Use File->Apply Template, and navigate to a project file
> from a similar shoot that has been successfully stitched.
> Alternatively, make use of the fact that (assuming you are using a
> panohead with detents): all the images in a row will have the same
> pitch and the same roll, and all the images in a column will have the
> same yaw.
>
> John
>
>
• I carry some small fluorescent post-it notes in my kit. So if I have the big blank wall, I can apply them. Works really well - solved that problem. As for
Message 8 of 9 , Feb 6, 2009
I carry some small fluorescent post-it notes in my kit. So if I have the
big blank wall, I can apply them. Works really well - solved that problem.
As for the sky, my ladder is not tall enough...

Rick Drew

[Non-text portions of this message have been removed]
• I was thinking about getting a ladder :-)
Message 9 of 9 , Feb 6, 2009
I was thinking about getting a ladder :-)

Rick Drew wrote:
> I carry some small fluorescent post-it notes in my kit. So if I have the
> big blank wall, I can apply them. Works really well - solved that problem.
> As for the sky, my ladder is not tall enough...
>
>
>
> Rick Drew
>
>
>
> [Non-text portions of this message have been removed]
>
>
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