To interpolate or not to interpolate: Subjective assessment of interpolation performance on a light field display

2018 - 3dtv-Conference: The True Vision - Capture, Transmission and Display of 3D Video (3dtv-Con)

Kara²,

Barsi

et al. 2018

Self Cite

Light-field visualization is continuously emerging in industrial sectors, and the appearance on the consumer market is approaching. Yet this process is halted, or at least slowed down, by the lack of proper display-independent light-field formats. Such formats are necessary to enable the efficient interchange between light-field content creation and visualization, and thus support potential future use case scenarios of this technology. In this paper, we introduce the results of a perceived quality assessment research, performed on our own novel light-field visualization format. The subjective tests, which compared conventional linear camera array visualization to our format, were completed by experts only, thus quality assessment was an expert evaluation. We aim to use the findings gathered in this research to carry out a large-scale subjective test series in the future, with non-expert observers.

“…For visual stimuli, we used the 972-faced polyhedron and the structure of 120 regular dodecahedra 5 . In this paper, we refer to them as stimulus A and B, respectively.…”

Section: Experimental Setup and Obtained Resultsmentioning

confidence: 99%

Section: Experimental Setup and Obtained Resultsmentioning

confidence: 99%

Expert Evaluation of a Novel Light-Field Visualization Format

2018 - 3dtv-Conference: The True Vision - Capture, Transmission and Display of 3D Video (3dtv-Con)

Kara²,

Barsi

et al. 2018

Self Cite

“…For stimuli A, B and D, variation in Q 3D scores was very small, whereas for stimulus C, Q 3D scores varied significantly. This can be attributed to the fact that stimulus C has large depth variations compared to other three stimuli [19]. Also, the absence of explicit angular distortions may have resulted in low variations in Q 3D , as the angular quality score has higher weight during the pooling operation.…”

Section: Resultsmentioning

confidence: 99%

Objective Quality Evaluation of an Angularly-Continuous Light-Field Format

Tamboli

2018 International Conference on 3D Immersion (IC3D)

Kara

et al. 2018

Self Cite

With the rapid advances in light-field display and camera technology, research in light-field content creation, visualization, coding and quality assessment has gained momentum. While light-field cameras are already available to the consumer, lightfield displays need to overcome several obstacles in order to become a commonplace. One of these challenges is the unavailability of a light-field visualization format which can be used across various light-field displays. Existing light-field representations are optimized for specific displays and converting them for visualization on a different display is a computationally expensive operation, often resulting in the degradation of perceptual quality. To this end, an intermediate, display-independent and angularly-continuous light-field representation format has been proposed recently, targeted towards large-field-of-view light-field displays. In this paper, we evaluate the said data format in terms of degradation in objective quality under three compression methods. We found that, while offering display-independence, the intermediate light-field format maintains the same objective quality in general and achieves higher objective quality in some cases compared to the conventional linear camera representation.

“…The effect of view interpolation is also addressed in the work of Cserkaszky et al [39], visualizing content on the C80 cinema system. The difference is that while Tamboli et al investigated how the ratio of genuine to synthesized views affects the user experience (the more the views synthesized, the higher the degradation in QoE), Cserkaszky et al targeted a potential benefits of synthesis and compared the performance of interpolation methods.…”

Section: Perceived Quality Of Light Field Visualizationmentioning

confidence: 99%

“…This means that the views that were not transmitted by the server would be interpolated real-time at the client's side, restoring the original angular resolution. Although the extent of interpolation has to be kept within reasonable boundaries in order to prevent major visual degradations, the restoration of angular resolution can significantly contribute to the user experience [39].…”

Section: Perceived Quality Of Light Field Visualizationmentioning

confidence: 99%

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

Kara

IEEE Trans. on Broadcast.

Martini

et al. 2018

Self Cite

Abstract-Light field visualization has progressed and developed significantly in the past years. At the time of this paper, light field displays are utilized in the industry and they are commercially available as well. Although their appearance on the consumer market is approaching, many potential applications of light field technology have not yet been addressed, such as video streaming. In this paper, we present our research on the dynamic adaptive streaming of light field video. In order to evaluate the presented concept of quality switching, we carried out a series of subjective tests, where test participants were shown light field videos containing stallings and switches in spatial and angular resolution.