Subjective quality assessment of scalable video coding: A survey

Abstract

Scalable video coding is a promising solution for efficient video content distribution to users having heterogeneous network and terminal capabilities. Thanks to its inherent multidimensional adaptability, a scalable bit stream can be used to simultaneously transmit multiple video sequences having different bit rates to corresponding target users, without necessity of re-encoding or transcoding. In order to exploit such an advantage effectively, it is crucial to understand the effects of multidimensional scalability options on the perceived quality and the trade-off between the scalability dimensions through subjective quality assessment. This paper reviews existing studies aiming at achieving this goal in order to summarize their results and common findings.Index Terms-Scalable video coding, subjective quality assessment, quality of experience

Subjective and objective quality assessment of videos in error-prone network environments

“…This is particularly effective in our case where two different quality factors (i.e., coding and packet loss artifacts) exist simultaneously in each stimulus and thus assigning a score for each stimulus is not easy for subjects. By simplifying the subjects' task, the reliability of the results can be significantly enhanced [16,17].…”

“…If the ratio of such violations among all possible triads exceeds a certain threshold, the subject is considered as an outlier. When a tie is included in the rating scale as in our case, the transitivity violation can be examined as follows [17]. Let S i → S j mean that S i is preferred to S j by a subject, and let S i ↔ S j indicate a tie between …”

Quality perception of coding artifacts and packet loss in networked video communications

“…This is particularly effective in our case where two different quality 1358 factors are involved simultaneously and thus assigning a score for each stimulus is not easy for subjects. By simplifying the subjects' task, the reliability of the results can be enhanced [11], [12].…”

An Anatomy of SVC for Full HD Video Streaming

“…Several research works have investigated the subjective video quality of SVC [17]- [21]. For instance, Politis et al measured the effect of user mobility and handover on the objective and subjective video quality of SVC and H.264/AVC codecs using two CIF video sequences, and reported that SVC outperforms H.264/AVC in both objective and subjective video qualities [17].…”