On Sat 09-Jan-2010 at 13:31 +0100, Wolfgang Hugemann wrote:
So I basically suggest 1) to use modern faccades as suitable targets
Yes the tutorial doesn't have all the possible methods: the simplest is to stitch a panorama, you can also correct perspective of a rectangular object like a building using horizontal and vertical control points.
The straight-line technique uses a string in the tutorial because it is a controlled condition, though a single photo of one string isn't enough, a series of photos are needed.
I would also suggest to rewrite the Simple Lens Calibration example in regard to this. I am however not sure 1) whether the ordering of the horizontal points really has to be reversed for the target image 2) how to initiate the optimisation without using Hugin, which now more or less just creates a superfluous overhead.
You can use the autooptimiser command-line tool to optimise a Hugin project.
3) whether it would be more efficient to use horizontal and vertical lines instead of general lines -- the horizontal lines however being not strictly horizontal in the image, due to rotation of the camera.
Yes you can use horizontal and vertical lines to determine lens parameters. You do need a subject where the lines are actually perpendicular, you also need to optimise roll, pitch and yaw in addition to lens parameters.
This all works fine, but is limited to rectilinear output, meaning that you can't determine parameters for very wide angle fisheye photos.
-- Bruno
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