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Rob Park wrote to me offline:<br>
<blockquote type="cite"
cite="mid6b8a2f8b0501160103618fa419@mail.gmail.com">
<pre>When I was stitching the photos, it</pre>
<pre wrap="">seemed like it was not even really necessary to correct the images at
all, only to position them for stitching (eg, they need to be moved
around relative to each other on a flat plane, but don't really need
much in the way of lens correction). Setting the lens to 2 degrees
seemed to have the best effect, but is there a way to tell hugin to
operate in a flat plane instead of the 360 degree universe that it
expects?
</pre>
<pre wrap=""> </pre>
</blockquote>
I am replying on-list because I think the question is of general
interest. It also exposes some difficulties with the hugin gui.<br>
<br>
One way to do the stitching that Rob wants is to set a=b=c=0, do NOT
optimize pitch/yaw, but DO optimize roll/d/e individually for every
image except the anchor.<br>
<br>
This may seem bizarre, but if I have done the math right, it
exactly models what you want. Varying roll/d/e corresponds to
2-dimensional rotation and shifting when the input and output images
are rectilinear and there is no a/b/c correction.<br>
<br>
In PTGui, this strategy is easy to implement -- just check the
appropriate boxes in the optimizer panel. A bug in the PTGui editor
window prevents me from seeing the entire result. I have to actually
stitch to see it.<br>
<br>
In hugin, I cannot figure out how to do the optimization just with the
gui (windows version "0.4 pre" dated 9/15/2004). <br>
<br>
I can get the optimization to work by manually editing the optimizer
script, for example to insert the line<br>
<br>
v d0 d1 d3 d4 e0 e1 e3 e4<br>
<br>
After optimization, the hugin preview still looks awful -- apparently
huge stitching errors despite good results reported by the optimizer.
But the final stitch through nona is fine. Perhaps there is a bug in
hugin preview also.<br>
<br>
But I do not have much experience with hugin.<br>
<br>
Perhaps someone can tell us how to do the roll/d/e optimization more
easily with the hugin gui.<br>
<br>
--Rik<br>
<br>
<blockquote type="cite" cite="mid41EA1032.3040109@computer.org"><br>
</blockquote>
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