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Image quality degradation by light scattering in display devices.
1Department of Diagnostic Radiology, Henry Ford Health System, Detroit, MI 48202, USA.
Journal of Digital Imaging
|May 26, 1999
Summary
Display image quality is degraded by veiling glare and ambient light reflection. These effects, caused by light scattering and surface reflections, reduce contrast and obscure details on monitors and film.
Area of Science:
- Optics and Photonics
- Display Technology
- Image Quality Assessment
Background:
- Veiling glare and ambient light reflection significantly degrade display image quality.
- Veiling glare arises from diffuse light scattering within the display's emissive structure.
- Ambient light reflection involves diffuse and specular light scattering from the display surface.
Purpose of the Study:
- To quantify the impact of veiling glare and ambient light reflection on display image quality.
- To compare the performance of film, monochrome monitors, and color monitors regarding light reflection and glare.
- To assess the effectiveness of antireflective coatings in mitigating these image quality issues.
Main Methods:
- Measurement of glare ratio using a 1-cm-diameter black spot test image.
- Quantification of diffuse reflection coefficient (luminance/illuminance) under ambient light.
- Determination of specular reflection coefficient (luminance/luminance) for display surfaces.
Main Results:
- Glare ratios were 555 (film), 89 (monochrome monitor), and 25 (color monitor).
- Diffuse reflection coefficients were 0.026 (film), 0.058 (monochrome monitor), and 0.025 (color monitor with antireflective coating).
- Specular reflection coefficients were 0.011 (film), 0.041 (monochrome monitor), and 0.021 (color monitor with antireflective coating).
Conclusions:
- Both veiling glare and ambient light reflection increase black region luminance, reducing overall contrast.
- Specular reflections further interfere with the visibility of fine details in displayed images.
- Color monitors, especially with antireflective coatings, demonstrate superior performance in minimizing glare and reflection compared to monochrome monitors and film.