Subjective Quality of Spatially Asymmetric Omnidirectional Stereoscopic Video for Streaming Adaptation

Curcio, Igor D. D.; Naik, Deepa; Toukomaa, Henri; Zare, Alireza

doi:10.1007/978-3-030-04375-9_36

Cited by 4 publications

(2 citation statements)

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“…An example of segment allocation and delivery during a watching session [2] The base operational point for 360-degree video streaming is transmitting the whole video at a constant high quality, regardless of the user's input (i.e., the direction the user is looking at, called viewport). Transmitting video at constant quality is known as the Viewport-Independent streaming model [3].…”

Section: Figurementioning

confidence: 99%

“…However, the end user watching a 360-degree video on a Head-Mounted Display (HMD) sees only a part of the omnidirectional video panorama at a given time and, therefore, there is no need to stream the content outside the user's current viewport. The model that transfers the area inside the viewport in high quality and the surrounding space in lower quality (or not streaming it at all) is called the Viewport-Dependent streaming model, also known as viewport-adaptive model [3]. One implementation of that model is to split the viewing area into tiles [2], each having multiple quality levels.…”

Section: Figurementioning

confidence: 99%

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Analysis of User Exploration Patterns during Scene Cuts in Omnidirectional Videos

Monakhov¹,

Naik²,

Curcio³

et al. 2018

Smpte 2018

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Video content is usually represented as a sequence of scenes joined together. Two adjacent scenes can share the same semantic content, similar to filming the scene from different angles, or they can describe semantically different content. The methods that switch between two adjacent scenes are called scene transitions. In the case when two scenes are just concatenated with no additional effects, the transition is called a scene cut. The scene transition is a vital instrument for guiding user's attention in classical cinema, but the impact of scene transitions becomes more relevant in a 360° video environment. During the scene transition, the user loses his/her previous interest point, that may lead to a change in the exploration behavior and affect the content delivery system, diminishing the viewing experience of the user. In this work, we have studied how the user exploration behavior changes in terms of the exploration range and angular speed metrics, and we have investigated whether this change of exploration behavior is different when the scene cut is within the same semantic content compared to the semantically different scenes.We conducted an experiment with 20 test subjects. The experiment consisted of two sets of videos. The first set included eight 20 second videos that were semantically different from each other. The videos were stitched together in a temporal domain using scene cuts. The second set was comprised of three videos with 4-5 scene cuts in each of them. The shots between the cuts were semantically consistent. We collected the positional data of head-mounted displays and converted it into the defined metrics, as per above explanation. Our research showed an increase in exploratory behavior and also revealed that there was a delay between the scene transition and the start of the exploration. The results were attested using t-test procedures. We have also shown that the exploratory behavior is dominant in the inter-scene transitions compared to the intra-scene transitions.

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%