Linear Panoramas

[davidbm]

Hello, is it possible make linear panoramas in PTGUi

http://www.queenstreet.co.nz/queenstreet/streetscroll/default.asp

Thank you :-)

[JPS]

I don't see why it wouldn't work ? IMO it depends only on your way of
shooting the multiple images: staying at the same distance of the
other side of the street and shooting -as much as possible- at a 90°
angle of the subject ! It also depends on your choice of lens: I think
a 50mm or slightly longer lens would be much better than a wide-angle,
because of the lack of distortion !

;-)
J-P.

[PTGui Support]

See 5.5:
http://www.ptgui.com/support.html#5_5

Joost

[davidbm]

Thank you :-)

[Joergen Geerds]

as far as I know, it's mostly a matter of creative/manual blending...
Last night I stumbled over a pretty interesting research paper for
exactly this problem:
http://research.microsoft.com/en-us/um/people/kopf/street_slide/index.html

joergen
newyorkpanorama.com

[René Beaumier]

Thank a lot Joergen, realy interesting.
Did you know if this software will be available soon?
Thank Rene
Le 11-01-03 à 09:40, Joergen Geerds a écrit :

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[Joergen Geerds]

On Jan 3, 1:06 pm, René Beaumier <cp...@videotron.ca> wrote:
> Thank a lot Joergen, realy interesting.

you are welcome

> Did you know if this software will be available soon?

no, i don't think it will be a real product anytime soon... if
anything it will be part of bing maps.

joergen
newyorkpanorama.com

[Eric O'Brien]

I might point out that this, or very similar questions, appear with
great regularity. If 'one of' the Joosts could figure out a way to be
able to accomplish this sort of thing, perhaps PTGui would get a few
more sales. No telling of course.

And, apparently, it is a difficult problem.

Hugin seems to have added some features lately that (may) make this
possible. I haven't tried it myself, but I get the impression that
getting the result you desire is a bit problematic.

eo

[Jeffrey Martin]

FWIW, the original idea (apparently) behind google streetview was to do "linear panos" along streets.

anyone remember the A9 search engine? they had a few cities with linear panos of storefronts.

but i guess google realized that linear panos are sort of a nightmare and they went with normal panos instead.

[Jeffrey Martin]

Eric,

I believe that it already exists in ptgui - you can use Viewpoint Correction on all images. That's the same as what hugin has, basically.

[Erik Krause]

Am 06.01.2011 06:47, schrieb Eric O'Brien:

> And, apparently, it is a difficult problem.

The difficulty is not the stitching - PTGui is very well equipped to do
this using viewpoint correction. The problem is parallax if the subject
isn't perfectly flat. Unfortunately there is no automatic solution to
this, it will always involve a lot of manual work.

> Hugin seems to have added some features lately that (may) make this
> possible.

Hugin mosaic mode is similar to PTGui viewpoint correction:
http://wiki.panotools.org/Stiching_a_photo-mosaic
It is implemented differently but the goal is the same: distorting
images taken from different viewpoints such, that one plane of the
subject fits a given panorama or an anchor image.

I must admit that I never tried to use viewpoint correction to stitch
linear panoramas, but it definitely should work.

--
Erik Krause

[Erik Krause]

Am 06.01.2011 12:10, schrieb Erik Krause:

> I must admit that I never tried to use viewpoint correction to stitch
> linear panoramas, but it definitely should work.

I did a quick test with three images and it worked nicely (all advanced
mode): Load all images into PTGui, choose rectilinear for output,
generate control points, on Optimizer tab deselect Field of View
optimization (use EXIF - no pseudo-orthographic projection with 1� FoV),
uncheck Yaw for all images (no rotation involved) check Roll, Pitch and
Viewpoint for all but the anchor image (uncheck all for the anchor
image). Optimize. You will have to adjust the result FoV manually, since
PTGui fails to Fit Panorama, but that's it.

The result gets better if you calibrate the lens first.
--
Erik Krause

[PTGui Support]

It's very simple: stitching images from different camera locations is
physically impossible, except when the subject to be photographed is
completely flat. Most linear street panoramas that you see are the
result of a lot of manual post processing effort to hide the effects of
parallax (think of lamp posts and cars in front of buildings, or the
perspective change in side streets as you move the camera).

Hugin and other stitchers have recently also implemented viewpoint
correction that has been available in PTGui Pro for years. This is
helpful for creating linear panoramas but it still only works for flat
subjects.

Joost