input cam. Input a set of calibration files referenced by the
Calib Filename text string (eg calib_file). There are three files that will
be searched for and read if present.
calib_file.l.cam : Full left camera parameter description.
calib_file.r.cam : Full right camera parameter description.
calib_file.s.cam : Stereo transformation and free parameter
covariances.
In addition the inputted files are duplicated in
calib_file_save.l.cam
calib_file_save.r.cam
calib_file_save.s.cam
in order to prevent accidental loss.