Ms. Sara Kepplinger Profile

Sara Kepplinger

at Technische Univ Ilmenau

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Proceedings Article | 25 February 2014 Paper

Quality evaluation of stereo 3DTV systems with open profiling of quality

Sara Kepplinger, Nikolaus Hottong

Proceedings Volume 9014, 901419 (2014) https://doi.org/10.1117/12.2038981

KEYWORDS: 3D displays, Glasses, Profiling, Calibration, Display technology, 3D metrology, Camera shutters, Standards development, Eyeglasses, Eye

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Current work describes two evaluations in two different locations investigating possible differences in the experience of quality of stereo 3DTV systems. Herein, the work presents the usage of the Open Profiling of Quality method. This method allows going beyond up to now considered distinctive features (e.g., glasses wear comfort, brightness…). During the first evaluation standardized display-settings were used for each tested system. In the second study all systems were tested with their provided factory settings. Other factors like test stimuli, play out technology, laboratory settings, and viewing position were strictly standardized. Additionally, influencing factors like spectacle frames and display design have been minimized by using same eyeglass frames (but different technology) and hiding the display chassis. The results of both evaluations show distinct influences of display technology on quality perception. This is affirmed by the quality describing attributes deriving from the open profiling of quality method beyond the quantitative quality rating. This influence has to be considered within subjective evaluation of quality in order to support test-retest reliability and user centered approaches on quality evaluation of stereo 3D visualization. Different quality perception of different display technologies was confirmed even under different TV settings.

Proceedings Article | 25 January 2012 Paper

Linking quality assessment of free-viewpoint video objects up with algorithm development

S. Kepplinger

Proceedings Volume 8293, 82930U (2012) https://doi.org/10.1117/12.906582

KEYWORDS: Video, Cameras, Algorithm development, Image processing, Eye models, Quantum efficiency, Taxonomy, Image segmentation, Eye, Binary data

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This paper presents an approach using an extended model for the linkage of Quality of Experience with the technical realization, making use of algorithmic developments in the field of free viewpoint video. The interlinking model of Quality of Experience with the technical realization is implemented by taking into account subjective evaluation results as well as possible variances of algorithmic processes. This is used to support the scalability and adaptability of the system based on the end users' requirements. The problem is a missing link bringing together quality perception and algorithm design in a quantitative and practical way. An extended model is defined after a detailed literature review (taking into account existing approaches) showing the lack of an adequate way to link Quality of Experience with algorithmic developments. The presented model includes prior evaluation activities on the subjective quality assessment of free viewpoint video objects used within the context of video communication to support eye contact. However, quality estimation in this particular use case has not been covered yet, and adequate approaches are missing. A methodological approach to define quality influencing factors, and its results, are presented. An exemplary extended model using a taxonomy approach is introduced. A description in detail of the interlinking model taking into account existing evaluation results is given, and a way of weighting quality influencing factors therefore is outlined.

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