Re: [hugin-ptx] Aerial images, image positioning model

[Terry Duell]

On Mon, 07 Mar 2016 23:20:18 +1100, Andrés Llopis Lozano  
 wrote:



From here,

http://hugin.sourceforge.net/docs/manual/Image_positioning_model.html

I get that the image positioning model assumes that all pictures are  
taken

from the same spot and taken by rotating around a no-parallax axis.

For the case of aerial imagery clearly this is not the case, I have  
planar

motion at a constant height.

Is it possible to stich these imagery using hugin? What would be a nice
approach to this? If the answer is no... do you know any other free
software able to do this?



This case sounds very much like Hugin's Mosaic mode, but success using  
this mode would depend very much on whether the surface you are flying  
over differs very much from a plane surface.
I suspect it probably does, in which case the altitude would probably need  
to be large relative to the surface height variations.
Have a look at the mosaic mode tutorial to see if that helps at all  
.
As an alternate you could look at the GRASS GIS (FOSS)  
, as I would think your problem is a fairly  
common one in that community, but unless you are familiar with GIS it  
might be a bit of learning curve, but there would be a lot of help  
available.



Cheers,
--
Regards,
Terry Duell

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Re: [hugin-ptx] still pano from video

[David Haberthür]

Ciao Battle.

> Some time ago I saw on this forum, I think, a video of stills being extracted 
> from a video taken of a tower, and assembled into a still. Seems like it was 
> European tower of some kind.  There was a hyperlink to an external site.  I 
> was trying to find this thread in order to solve the opportunity described 
> below.  Thanks in advance for you help.
> 
> I want to take video, extract stills, super resolution (optional), and 
> assemble a finished still panorama.  I searched that archives, and can't find 
> the item I mention above, can can't quite find an appropriate thread that 
> answers how to do this.  I could use some pointers on this process.

The process is quite simple once you’ve extracted the frames from the movie.
Here’s a little tutorial I wrote 7 (!) years ago: 
http://habi.gna.ch/2009/04/10/panoramas-from-low-quality-movies/
Obviously getting a movie off an iPhone is much easier now, but the other 
points in that post are still valid.

Depending on the format of your movie, you can use ImageJ (http://fiji.sc/Fiji) 
or VLC to extract the frames, and stitch those with hugin afterwards.

Hope that helps.
Habi

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[hugin-ptx] Aerial images, image positioning model

[Andrés Llopis Lozano]

>From here, 

http://hugin.sourceforge.net/docs/manual/Image_positioning_model.html

I get that the image positioning model assumes that all pictures are taken 
from the same spot and taken by rotating around a no-parallax axis.

For the case of aerial imagery clearly this is not the case, I have planar 
motion at a constant height. 

Is it possible to stich these imagery using hugin? What would be a nice 
approach to this? If the answer is no... do you know any other free 
software able to do this?

Regards

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Re: [hugin-ptx] Re: Records office preparation

[bugbear]

Battle wrote:

My experience with this kind of thing is to maximize the distance to the object 
using a longer lens when possible which reduces the angles and amount of 
variation from image to image which in the end tends to overcome the variation 
of handheld image capture.  For example, can you put the maps on a floor, and 
stand on a chair?  That would increase the distance from camera to object from 
2 feet to 8 feet.  Is there a balcony in the room that you could shoot down to 
a table on the lower level?
Now we're talking 15 feet or more.


Yes - back in 2014 (which is when this thread is from) I worked the following 
out:

https://groups.google.com/forum/#!topic/hugin-ptx/nynP68FT5WA

  BugBear

> Would they let you put the camera on a monopole and hold it above your head 
to shoot down to the table?  That might get you 4 to 6 feet away.  Even if all 
this were not permissible, maybe you could shoot tethered, and just hold the 
camera above your head looking at the computer screen to frame the shot.  If you 
can shoot the map in two images, then you can probably hold the camera in place 
close enough to use the bracket feature to get 3-9 shots from each

position with one shutter press.  Chances of getting usable images when 
shooting handheld this way increase as others have pointed out.

Also any relief change (from a flat plane) will lead to parallax issues.  
Getting the maps to lay flat as possible is more critical the closer you are to 
the maps.  Do they have a display (drafting) case or table, or other table 
large that has a tilting top which will tilt 45 degrees?  This would allow you 
to stand back from the maps far enough to shoot handheld.

On Tuesday, May 6, 2014 at 4:20:43 AM UTC-4, bugbear wrote:

I am about to visit a record office. Their rules
permit cameras, but not tripods (let alone pano heads!)

I wish to capture the image of some 18th c maps, which are large,
in good detail. The obvious strategy is to take multiple
shots and stitch, but the shots will all be taken from different
position and angles (since they'll be taken freehand).

But since the maps are 2D a stitch should still be possible.

I have tested this approach at home (cheating using a tripod!)
and a road atlas.

I would welcome advice.

 BugBear

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[hugin-ptx] xml

[Valerio De Luca]

Hi guys,

Can I use (or create) a xml for drive stitching processing for spherical 
pano in hugin?

I mean yaw, pitch, roll like e.g.:








P36 mode
Generated by VRDrive


up
portrait






12


























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