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Acceptability ratings for simulated image distortions of static images corresponding to different viewing angles for a flat panel display

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Subjective ratings of image quality have always played an important role in the field of display industries in order to help understand the observer tolerance of a product. This paper focuses on establishing tolerance levels in terms of acceptability ratings for the distortions produced by viewing the display at different angles away from normal. The objective of this study was to simulate the shift in luminance and hue that occurs when viewing a flat panel display at different angles using complex static scenes (car, landscape and portrait). Observers rated the images both in terms of acceptability/unacceptability. All simulations were carried out using the Visual Stimulus Generator (ViSaGe, Cambridge Research System) controlled by Matlab on a Sony Trinitron CRT monitor. A total of 20 subjects participated in this study. All subjects were between the age group of 15 to 35 years of age and had average to superior color discrimination categorized based on the FM-100 Hue color vision test. Results from the rating experiments showed that, irrespective of the complexities in the images, average ΔELab greater than five times thresholds (average discrimination threshold of vectors that change in both hue and luminance for different uniform CRT colors) were less than 50% acceptable. This corresponds to viewing angles greater than 10o for a given flat panel display. The car was rated more acceptable at lower ΔEs and more unacceptable at higher ΔEs compared with the other two scenes. Thus, for flat panel displays, observers were more tolerant to color distortions on natural scenes and were less tolerant to manufactured objects like car.
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Document Type: Research Article

Publication date: January 1, 2012

More about this publication?
  • Started in 2002 and merged with the Color and Imaging Conference (CIC) in 2014, CGIV covered a wide range of topics related to colour and visual information, including color science, computational color, color in computer graphics, color reproduction, volor vision/psychophysics, color image quality, color image processing, and multispectral color science. Drawing papers from researchers, scientists, and engineers worldwide, DGIV offered attendees a unique experience to share with colleagues in industry and academic, and on national and international standards committees. Held every year in Europe, DGIV papers were more academic in their focus and had high student participation rates.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual papers for details.

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