Impact of interactivity on the assessment of quality of experience for light field content

Abstract

Abstract-The recent advances in light field imaging are changing the way in which visual content is captured, processed and consumed. Storage and delivery systems for light field images rely on efficient compression algorithms. Such algorithms must additionally take into account the feature-rich rendering for light field content. Therefore, a proper evaluation of visual quality is essential to design and improve coding solutions for light field content. Consequently, the design of subjective tests should also reflect the light field rendering process. This paper aims at presenting and comparing two methodologies to assess the quality of experience in light field imaging. The first methodology uses an interactive approach, allowing subjects to engage with the light field content when assessing it. The second, on the other hand, is completely passive to ensure all the subjects will have the same experience. Advantages and drawbacks of each approach are compared by relying on statistical analysis of results and conclusions are drawn. The obtained results provide useful insights for future design of evaluation techniques for light field content.

Quality Assessment Of Compression Solutions for Icip 2017 Grand Challenge on Light Field Image Coding

“…A passive assessment was considered in order to ensure the same experience for all participants [15]. To avoid negative bias in the subjects, only a subset of 97 out of 225 perspective views was presented in the animation, as suggested in [16], since the rest of the views already presents high visual distorsion before compression that can negatively affect the results.…”

Evaluation of the Concept of Dynamic Adaptive Streaming of Light Field Video

“…While objective performance was mainly measured by indicators such as average task completion time, the subjective scores were collected via the User Experience Questionnaire (UEQ) [49]. Interactivity is also address by the work of Viola et al [50], and it is without a doubt a significant potential for light field systems, but passive visualization use cases, such as video streaming, is expected to maintain a strong position in the future as well.…”

Comparison and Evaluation of Light Field Image Coding Approaches

“…The second methodology passively shows the different viewpoints composing the LF content, in order to ensure that all users see and rate the exact same content. The two methodologies have been analysed by the authors and were found to be highly correlated [6]. The two methodologies are described in details and applied to the problem of assessing the visual quality of the five compression algorithms.…”