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


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

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


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



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


-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
--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
                      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



Dima Kogan, <>


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Licensed under the Apache License, Version 2.0 (the "License"); You may obtain a copy of the License at