mrcal-show-splined-model-surface - Visualizes the surface represented in a splined lens model
$ mrcal-show-splined-model-surface cam.cameramodel x
... a plot pops up showing the surfaceSplined models are described at
L<http://mrcal.secretsauce.net/lensmodels.html#splined-stereographic-lens-model>Splined models are built with a splined surface that we index to compute the projection. The meaning of what indexes the surface and the values of the surface varies by model, but in all cases, visualizing the surface is useful.
This tool can produce a plot in the imager domain (the default) or in the spline index domain (normalized stereographic coordinates, usually). Both are useful. Pass --spline-index-domain to choose that domain
One use for this tool is to check that the field-of-view we're using for this model is reasonable. We'd like the field of view to be wide-enough to cover the whole imager, but not much wider, since representing invisible areas isn't useful. Ideally the surface domain boundary (that this tool displays) is just wider than the imager edges (which this tool also displays).
model Input camera model. If "-' is given, we read standard
input
{x,y} Whether we're looking at the x surface or the y
surface -h, --help show this help message and exit
--extratitle EXTRATITLE
Extra title string for the plot
--hardcopy HARDCOPY Write the output to disk, instead of making an
interactive plot
--terminal TERMINAL gnuplotlib terminal. The default is good almost
always, so most people don't need this option
--set SET Extra 'set' directives to gnuplotlib. Can be given
multiple times
--unset UNSET Extra 'unset' directives to gnuplotlib. Can be given
multiple times
--imager-domain By default, this produces a visualization in the
domain of the spline-index (normalized stereographic
coordinates). Sometimes it's more informative to look
at the imager domain instead, by passing this option
--imager-bounds By default we communicate the usable projection region
to the user by displaying the valid-intrinsics region.
This isn't available in all models. To fall back on
the boundary of the full imager, pass --imager-bounds.
In the usual case of incomplete calibration-time
coverage at the edges, this results in a very
unrealistic representation of reality. Leaving this at
the default is recommended
--observations If given, I show where the chessboard corners were
observed at calibration time. This is useful to
evaluate the reported unprojectable regions.https://www.github.com/dkogan/mrcal
Dima Kogan, <dima@secretsauce.net>
Copyright (c) 2017-2020 California Institute of Technology ("Caltech"). U.S. Government sponsorship acknowledged. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License"); You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0