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Related Experiment Videos

Linearity of cephalometric digitizers.

E Eriksen1, B Solow

  • 1Department of Orthodontics, Royal Dental College, Copenhagen, Denmark.

European Journal of Orthodontics
|October 1, 1991
PubMed
Summary

This study introduces a new test for digitizing tablet linearity errors. The developed method visualizes and quantifies distortions, enabling accurate measurements and improved data acquisition.

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Area of Science:

  • Metrology
  • Geomatics
  • Instrumentation Science

Background:

  • Digitizing tablets are crucial for accurate spatial data capture.
  • Non-linearity errors in digitizing tablets distort coordinate measurements.
  • These distortions lead to inaccurate object dimension representation.

Purpose of the Study:

  • To develop a test procedure for diagnosing and visualizing linearity errors in digitizing tablets.
  • To quantify coordinate distortions (DXji, DYji) caused by non-linearity.
  • To propose a method for correcting non-linearity errors.

Main Methods:

  • Systematic recording of points from a calibrated test foil.
  • Development of algorithms to calculate coordinate difference matrices (DXji, DYji).
  • 3D mapping of non-linearity using UNIRAS-geopak software.

Main Results:

  • Tested digitizers exhibited diverse scaling errors, non-linearity fields, and random noise.
  • Identified variations in linearity across different digitizing surfaces.
  • Demonstrated the presence of coordinate distortions affecting measurements.

Conclusions:

  • The developed test procedure effectively diagnoses and visualizes digitizing tablet linearity errors.
  • Correction of scaling errors is often possible via control unit settings.
  • A novel method for correcting non-linearities using calculated matrices is proposed.

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