mrcal-show-distortion-off-pinhole - Visualize the behavior or a lens model

       Dima Kogan, "<dima@secretsauce.net>"

       This tool is used to examine how a lens model behaves. Depending on the model, the vectors could be very
       large or very small, and we can scale them by passing '--vectorscale s'. By default we sample in a 60x40
       grid, but this spacing can be controlled by passing '--gridn w h'.

       By default we render a heat map of the lens effects. We can also see the vectorfield by passing in
       --vectorfield. Or we can see the radial distortion curve by passing --radial

       Copyright (c) 2017-2023 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

mrcal 2.4.1-4build1                                2025-03-04                                           MRCAL(1)

       mrcal-show-distortion-off-pinhole - Visualize the behavior or a lens model

POSITIONALARGUMENTS
         model                 Input camera model. If "-' is given, we read standard
                               input

   OPTIONALARGUMENTS
         -h, --help            show this help message and exit
         --gridn GRIDN GRIDN   How densely we should sample the imager. By default we
                               report a 60x40 grid
         --vectorscale VECTORSCALE
                               Scale the vectors by this factor. Default is 1.0
                               (report the truth), but this is often too small to see
         --radial              Show the radial distortion scale factor instead of a
                               colormap/vectorfield
         --vectorfield         Plot the diff as a vector field instead of as a heat
                               map. The vector field contains more information
                               (magnitude AND direction), but is less clear at a
                               glance
         --show-fisheye-projections
                               If given, the radial plots include the behavior of
                               common fisheye projections, in addition to the
                               behavior of THIS lens
         --cbmax CBMAX         Maximum range of the colorbar
         --title TITLE         Title string for the plot. Overrides the default
                               title. Exclusive with --extratitle
         --extratitle EXTRATITLE
                               Additional string for the plot to append to the
                               default title. Exclusive with --title
         --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 pass to gnuplotlib. May be
                               given multiple times
         --unset UNSET         Extra 'unset' directives to pass to gnuplotlib. May be
                               given multiple times

       <https://www.github.com/dkogan/mrcal>

         $ mrcal-show-distortion-off-pinhole --vectorfield left.cameramodel

         ... a plot pops up showing the vector field of the difference from a pinhole
         projection