Subjective Study of the Impact of Compression, Framerate, and Navigation Trajectories on the Quality of Free-Viewpoint Video

This paper presents an exploratory study of the perceptual quality of different coding configurations of a real-time Free-viewpoint Video (FVV) system through a subjective experiment. In addition, different pre-defined camera trajectories were considered to analyze their impact on the visual quality and their relationship with the trajectories of the observers when freely exploring the content. For this experiment, a novel test methodology was used based on the participation of few observers who repeat the test in different moments. The results provide useful insights on options to reduce, if necessary, the amount of data to deliver FVV providing the highest possible quality to the end users. Also, they can help on defining trajectories that can be appealing for the users if they do not have the possibility to freely navigate through the content or that can be useful to perform valid subjective tests with pre-defined trajectories. Finally, the FVV dataset that has been created and used for this experiment will be made publicly available for the research community, once it is completed with more videos and results from future subjective tests.