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Mailinglist:PanoTools NG
Sender:'Mark Fink' markdfink@...
Date/Time:2016-Apr-28 14:42:07
Subject:Convert GPS to HShift and VShift


PanoTools NG: Convert GPS to HShift and VShift 'Mark Fink' markdfink@... 2016-Apr-28 14:42:07
Hi all,


I'm doing some aerial crop surveys and am trying to improve and streamline
the stitching process in PTGui. Due to the nature of the crops, (apple
orchards in this case), there aren't always enough unique features for PTGui
to latch onto and create control points.


Since these are from a moving platform, the primary difference between each
image is the HShift and VShift parameters, with YPR playing a secondary
role. If I recall correctly, the FoV is best set to something like 2000 and
NOT taken into the optimization. I did a test this morning with a handful of
images, and that produced a nice result.


My question is, can I use the embedded GPS coordinates in each image to
produce at least estimated values for the HShift and VShift parameters? That
would get all the images properly positioned in a grid, hopefully making the
control point generator more efficient and accurate. I'm not sure if I can
pull a heading value as well, which would give me approximate Roll values. 


My initial guess is that I would need to start with a base image, treating
that like an anchor, then calculate HShift and VShift as a relative
departures from the anchor image. Am I correct in that line of thinking?


Erik - how's that for something for the group to chew on?  :o)





Mark Fink <> 


Images That Transport You


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