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Perceived contrast on displays with different luminance ranges.

Patrik Sund1,2

  • 1Department of Medical Physics and Biomedical Engineering, Sahlgrenska University Hospital, Göteborg, Sweden.

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Medical display contrast perception is minimally affected by lighting conditions, suggesting current guidelines may be too restrictive. High luminance settings can maintain image quality, even in brighter environments.

Keywords:
image qualitymedical displayvisual perception

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Area of Science:

  • Medical Imaging
  • Human Visual Perception
  • Display Technology

Background:

  • Medical displays are crucial for healthcare, linking digital data to clinicians.
  • Effective information transfer relies on optimal contrast perception.
  • Evolving display technologies may exceed current medical display guidelines.

Purpose of the Study:

  • To investigate contrast perception limits across diverse lighting conditions.
  • To evaluate current medical display guidelines against empirical findings.
  • To determine the impact of display luminance on perceived image quality.

Main Methods:

  • Three display luminance settings (1-250, 6-500, 12-750 cd/m²) were tested.
  • Contrast thresholds were measured using a two-alternative forced-choice method.
  • Bar patterns at different spatial frequencies and pixel values were used across lighting conditions.

Main Results:

  • Low-frequency patterns showed consistent contrast thresholds (≈0.5 JNDs) across all luminance settings.
  • High-frequency patterns required significantly higher contrast, with worst visibility at the lowest luminance setting (1-250 cd/m²).
  • Differences between luminance conditions were generally minor.

Conclusions:

  • Medical displays with lower luminance ratios and higher minimum luminance can be viable.
  • The number of just noticeable differences (JNDs) is a reliable metric for perceived contrast.
  • Low luminance levels can impair visibility, particularly for fine details; avoidance is recommended.