ITU-T P.919 PDF

This Recommendation addresses the subjective evaluation of 360° video viewed with head-mounted displays (HMDs) that enable interaction of three degrees of freedom (3DoF) in head movement to explore content. As such, 360° video that may possibly include spatial audio presentation is different from traditional audiovisual media such as television or movies. 360º Videos are captured by cameras having a 360º field of view (FoV) and are thus able to capture the surrounding scene at each instant in time. Typically, when users view 360º videos on an HMD, they can turn around to view the immersive 360º space from different angles. Coupled with the large FoV presented by an HMD, 360º video can essentially provide a more immersive experience than that achievable with traditional video.

This Recommendation describes methods to evaluate aspects of quality of experience (QoE) for 360° video. In general, the test methods recommended in this Recommendation utilize a hierarchical design, where the entire evaluation process is divided into three abstraction layers. This Recommendation may be used to compare 360º viewing sessions where stimuli may differ in terms of, for example, the recording technique applied, the processing (such as projection schemes, coding or rendering-specific aspects), andthe HMD devices used. This Recommendation describes subjective evaluation of short (between 10 s and 30 s) 360º videos. Topics include assessment methods, subjective scales, environmental conditions, equipment and data analysis. These experiments can assess phenomena such as audiovisual quality and simulator sickness.