On Mon, Feb 08, 2016 at 09:40:09AM +0000, paul womack wrote:
> There was a lot of noise a while back (good $DEITY, it was 2010)
> about some software at MIT that helped get the camera
> into the right place;
>
> http://www.geek.com/news/new-camera-software-allows-you-to-line-up-your-photos-with-the-past-1272643/
>
> (full paper: http://people.csail.mit.edu/soonmin/rephoto/rephoto.pdf)
>
> But I can't find any information that falls *BETWEEN* the 2
> extremes of "keep moving tilll you get it right" and the MIT software.
>
> Does anyone know of any other guides to technique and/or software aids?
> I'm guessing lining up old and new photos might be mildly relevant to Hugin.
Occasionally I too wonder if things couldn't be done better. In my
local newspaper there is a column where they show an old and new
photograph. Sometimes they get it quite right, sometimes almost....
I think that to gather enough information you would need to build a 3D
model from the environment by taking a bunch of pictures with several
viewpoints in the general area of where the old one was taken. Then,
by matching the remaining buildings in th eold photograph to the 3D
model you can calculate the camera position of the old photograph
compared to the new images. Provided you've kept a precise log of
where you took the "set of photographs for the 3D model", you should be
able to calculate where to stand for the "NOW" picture...
If hugin is capable of helping, it would be through the "XYZ offset"
settings. Take a picture, import into hugin. Then, IIRC the XYZ offset
system, you will have to make "a plane, say the front of a building"
into the Z=0 plane. Check that everything on the building comes out
straight and perpendicular when you create a projection on Z=0. Then
when you match the old photograph to your new one, it should give you
XYZ offset numbers....
An important parameter that needs to go into this would be the lens
parameters for the old photograph. If that old photograph contains
enough information about that in the picture itself (which is likely
the only thing you have), remains to be seen.....
Interesting subject.... :-)
Roger.
>
> BugBear
>
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