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Grey level linearising circuit for computer-interfaced display devices.

T Woldeselassie1, P F Sharp

  • 1Department of Bio-Medical Physics and Bio-Engineering, University of Aberdeen, Foresterhill, UK.

Physics in Medicine and Biology
|July 1, 1989
PubMed
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This study introduces a novel electronic circuit for linearizing display devices, offering hardware-based correction for screen luminance. This advanced method provides flexibility and precise control over display linearity and contrast.

Area of Science:

  • Electronics Engineering
  • Display Technology
  • Image Processing

Background:

  • Display devices exhibit non-linearity in screen luminance relative to grey levels.
  • Software-based linearization requires recalibration when brightness and contrast settings change.
  • Existing methods necessitate data modification for each control setting adjustment.

Purpose of the Study:

  • To develop a hardware-based electronic circuit for display device linearization.
  • To provide a flexible solution for correcting display non-linearity across various control settings.
  • To introduce new controls for adjusting non-linearity correction and screen contrast independently.

Main Methods:

  • A radiometric procedure quantifies display non-linearity.
  • An electronic circuit utilizes non-linearity data for hardware-based linearization.

Related Experiment Videos

  • The circuit integrates after the digital-to-analogue converter or video processor.

    • Main Results:

    • The electronic circuit successfully linearizes screen luminance with respect to display grey level.
    • The circuit offers independent control over the amount of non-linearity correction.
    • A second control allows screen contrast variation without impacting achieved linearity.

    Conclusions:

    • The developed electronic circuit provides a flexible and convenient hardware solution for display linearization.
    • This approach overcomes the limitations of software-based methods, especially concerning control setting adjustments.
    • The circuit enhances display performance by enabling precise control over linearity and contrast.