Re: Old Panorama
- The road and one or two of the outer buildings are still extant. It's possible to position oneself on the hill to the north of the townsite and replicate the view, and it's fairly easy to do the same in Google Earth. If all else fails, it should be possible to take such a photo, and use it as an underlay in PhotoShop to allow manual correction of small slices of the panorama by aligning road and landscape features. That's a lot of work, however.
We have aerial photos from about 1939, very low resolution, and are trying to get a scan of the original panorama. We also have good closeups of two of the buildings, so I can accurately scale those. Without the overall position information the panorama or a good aerial photo can provide it will be next to impossible to get accurate information on the more distant buildings in the shots. It's an intriguing problem!
I'll look into PTGui. We use AutoCAD at work, so I might be able to get ahold of ImageModeler.
--- In PanoToolsNG@yahoogroups.com, Bjørn K Nilssen <bk@...> wrote:
> On Sun, 04 Aug 2013 17:36:15 +0200, Artkadet <v4alan@...> wrote:
> > I've posted the view in question in a new "Antiques" folder in Photos.
> > There's not much to cue off, but we do have some other photos of some of
> > the buildings, and are working to get more. I can easily use SketchUp
> > to model individual buildings, but placing them accurately relative to
> > one another requires rectifying the panorama, or an aerial photo, or
> > both... Fortunately, San Benito was a very small town!
> Small town indeed - and a very tiny photo/stamp as well... ;-)
> Not easy to see anything there, but it looks like all the houses are
> clustered into a small part of the pano?
> I guess I would load it into PTGui as a cylindrical view, and then render
> to a rectlinear view (or two?), and use that for Photomatching inside
> If you get the group right, it might help you plaing them right into the
> Google Earth terrain/environment, if there is nothing there any longer?
> > Alan
> > --- In PanoToolsNG@yahoogroups.com, Bjørn K Nilssen <bk@> wrote:
> >> On Sun, 04 Aug 2013 06:45:50 +0200, panovrx <mediavr@> wrote:
> >> > It depends what kind of panorama it is. It might just be a very narrow
> >> > format regular view (rectilinear). Or it might be shot with an early
> >> > rotating lens panorama camera, in which case it would be in
> >> cylindrical
> >> > perspective, maybe with an off-axis lens position (rising front). Or
> >> it
> >> > might be a panorama composed of multiple rectilinear views trimmed and
> >> > mounted together on some backing. PTGui and other panorama stitching
> >> > tools can be used to extract accurate rectilinear views which then can
> >> > be used together with modern shots or aerial views showing the same
> >> > features, street locations etc to generate models using the Match
> >> Photo
> >> > tool in Sketchup -- or dedicated tools for this, like Imagemodeler.
> >> It depends a very big lot on the original panorama.
> >> To give relevant advice it would be useful to see the source image.
> >> The old panoramas I've seen have been shot with a normal(wide),
> >> rectilinear lens, and the prints have been cropped and "assembled".
> >> I guess this will automatically generate some kind of cylindrical view,
> >> but without the curvy horizontal lines?
> >> When building a 3D model from such a source you're facing several
> >> problems.
> >> Using photogrammetric tools like ImageModeler (now only available to
> >> Autodesk customers), PhotoModeler and tgi3Ds PhotoScan (my favourite)
> >> would be the choice for making accurate models.
> >> However, that would usually require several photos, shot from different
> >> viewpoints - which you probably don't have.
> >> It would also require that the photos are uncropped - which you don't
> >> have
> >> neither, as they have to have been cropped to be assembled into a
> >> panorama.
> >> It would also usually require that the image format is rectilinear -
> >> which
> >> it probably isn't?
> >> The newer versions of ImageModeler may be able to handle panoramic
> >> views?
> >> My version is from before Autodesk bought it.
> >> This really leaves you with the built-in Photomatch tool in SketchUp.
> >> It uses a single photo, and calculates the fov and camera position based
> >> on the perspective lines. It usually requires a building with a known 90
> >> degrees corner to start with. It prefers uncropped photos too, but it
> >> makes it a lot easier to "cheat" than with strict photogrammetric tools.
> >> Combined with Google Earth it should be possible to make a fairly usable
> >> geolocated model in SketchUp - but as Peter writes - it all depends on
> >> the
> >> panorama itself, which we haven't seen yet...
> >> >
> >> > PeterM
> >> >
> >> > --- In PanoToolsNG@yahoogroups.com, "Artkadet" <v4alan@> wrote:
> >> >>
> >> >> I'm new here, and working with a friend on a digital reconstruction
> >> of
> >> >> a long vanished small town in California. We have an old panorama of
> >> >> the town. I'm considering using SketchUp and Google Earth to help
> >> >> position the buildings correctly relative to one another and the
> >> >> landscape. I believe that to do this I will have to correct the
> >> >> perspective in the old photo, in a way reversing the usual process of
> >> >> making a panorama. Does anyone here have any suggestions as to how
> >> >> best to go about this? Are their tools that can rectify a panorama,
> >> or
> >> >> is there a better way to go about this?
> >> >>
> >> >> Thanks!
> >> --
> >> Bjørn K Nilssen - 3D viz & 360 panoramas
> > ------------------------------------
> Bjørn K Nilssen - 3D viz & 360 panoramas
- --- In PanoToolsNG@yahoogroups.com, "Artkadet" <v4alan@...> wrote:
>It's best to upload your photo to the Files section. In the Photo section, the images are downsized to 480 pixels along the longest side.
> I've posted the view in question in a new "Antiques" folder in Photos.
- Am 05.08.2013 07:38, schrieb John Houghton:
> In the Photo section, the images are downsized to 480 pixels along the longest side.Nope, there are larger versions as well. See above left corner, click
Large or Original.
- Am 05.08.2013 04:30, schrieb Artkadet:
> The road and one or two of the outer buildings are still extant.That would be very good, simply to determine the angle of view of the
> It's possible to position oneself on the hill to the north of the
> townsite and replicate the view
old panorama. Without the correct angle of view it's very hard to do a
- --- In PanoToolsNG@yahoogroups.com, Erik Krause <erik.krause@...> wrote:
>Oh - so there are! Thanks for pointing that out. I'm sure that some time (years?) ago it was the case that only small images were available in the Photos section and the recommendation was to use the Files section to preserve the size. But maybe my memory is playing tricks on me and it was another forum.
> Am 05.08.2013 07:38, schrieb John Houghton:
> > In the Photo section, the images are downsized to 480 pixels along the longest side.
> Nope, there are larger versions as well. See above left corner, click
> Large or Original.
- I've figured out how to do this rather easily in SketchUp. SketchUp allows you to project an image onto any surface. Assuming it's a cylindrical projection, the world is essentially an image on a curved wall: the camera scans that image and places it onto the flat surface of the film plate. If I reverse that process and project the flat, distorted image back onto the curved wall, I should get an approximation of the original world. Then, by positioning the camera in SketchUp where the camera was in the world, I can look around and get a corrected image of any section of the arc. I estimated the angle of the old panorama by approximating the photographer's position in Google Earth and used the ruler tool to establish the bearings of the start and end of the panorama. It was pretty close to 180 degrees, so I built a half-circle wall in SketchUp and projected the old panorama onto it. The result looks pretty good: the vanishing lines of the various buildings converge on a single spot on the horizon. I've attached the corrected image of the town.