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add plumb-line distortion correction method #151

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@spdfghi spdfghi commented Apr 6, 2024

  1. implemention of Levenberg-Marquardt algorithm: distortion correction method in High-precision camera distortion measurements with a “calibration harp”, setction 6.c
  2. used simpler formula for least squares fitting error using straight lines : Straight lines have to be straight, eq 15-20

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