Hi,
In the future, should I optimize lens
parameters before or after aligning the images?
I don't think there is a clear argument for either order.
Also, I see you left X, Y
and Z unchecked for a particular image and checked all parameters for the
anchor image too, can you explain the rationale? I though I was supposed to
leave the anchor image unchecked. Was that the last one to be optimized?
What I did there wasn't exactly what I was intending to do. The plan was
to choose some image near the centre (eg, 09.tif, but any works), leave
yaw and pitch constrained to zero, optimise roll, don't optimise x/y/z
of that image. Roll can be optimised when you define some
vertical/horizontal lines. yaw/pitch/x/y/z of one image that can be
chosen freely are redundant degrees of freedom, so you can choose them
to be 0 (or any other value). After that the image should be nicely
horizontal without any manual alignment.
After a lot of trial and error, my workflow was to:
- Import all images and detect control points
- Clean obviously bad control points (normally when there's only 5 or so
in images that don't overlap)
- Select only one image at a time, start with XYZ, add Yaw, Pitch and
Roll, then plane yaw and pitch
- If the error was under 1unit, move on, else try a different order for
the parameters, another neighboring image, or review CPs
I think except for the optimisation of plane yaw and pitch that is fine.
After all images were aligned, I would go to the Move/Drag tab and try to
get it level. Throughout the process the alignment looked good but the map
was very skewed. Is there a better way of doing so (like
straighten/keystone in Capture One or PS), or is this fixed by the line CPs?
With good input images and sufficient vertical/horizontal lines this
step shouldn't be required. If one does rotate the image, yaw/pitch and
x/y/z shift of any image that is not centred at 0/0/0 is modified (as
one would expect). However, when shifting, the x/y/z shift of an image
centred at 0/0/0 stays constant while the plane yaw and pitch of all
other images get modified. While this is certainly a valid
transformation, I'd find it more intuitive to leave plane yaw/pitch
constant and modify the x/y/z shift of *all* images. One has to be
careful here.
cheers, lukas wirz
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