Comparison of 3D 360-Degree Video Compression Performance Using Different Projections

Jamali, Mohammadreza; Golaghazadeh, Firouzeh; Coulombe, Stéphane; Vakili, Ahmad; Vázquez, Carlos

doi:10.1109/ccece.2019.8861868

Cited by 12 publications

(5 citation statements)

References 7 publications

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“…The compression efficiency of the 360 • images differs based on the used projection [Jam19,Yu15]. Some studies considered compression approaches by just reprojecting the images and discovered that compression performance is content dependent.…”

Section: Related Workmentioning

confidence: 99%

An Analysis on Pixel Redundancy Structure in Equirectangular Images

Vazquez¹,

Cutchin²

2021

CSRN

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360◦ photogrammetry captures the surrounding light from a central point. To process and transmit these types of images over the network to the end user, the most common approach is to project them onto a 2D image using the equirectangular projection to generate a 360◦ image. However, this projection introduces redundancy into the image, increasing storage and transmission requirements. To address this problem, the standard approach is to use compression algorithms, such as JPEG or PNG, but they do not take full advantage of the visual redundancy produced by the equirectangular projection. In this study of the 360SP dataset (a collection of Google Street View images), we analyze the redundancy in equirectangular images and show how it is structured across the image. Outcomes from our study will support the developing of spherical compression algorithms, improving the immersive experience of Virtual Reality users by reducing loading times and increasing the perceptual image quality.

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Section: Related Workmentioning

confidence: 99%

An Analysis on Pixel Redundancy Structure in Equirectangular Images

Vazquez¹,

Cutchin²

2021

CSRN

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“…Jamali et al [13] compared the execution of contrasting projections in 3D and multi-view bit rate which utilises disparity estimation that comes out dull when evaluated with simulcast coding as more time spent for inter-view prediction however it gives maximum compression but later stands comfortable not only in quality and coding efficiency but also in Complexity. Kim et.…”

Section: Related Workmentioning

confidence: 99%

Emergence and Functionality of 3D Videos

Shamalik¹,

Koli²

2020

IJEAT

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Millions of videos are created and watched every day. Quality of desired video plays a significant role in modern day applications. Deep fake videos have alarmed the established institutions while amused others. A Three-dimensional(3D) stereoscopic film or a 3D Video for that instance is a motion picture that enhances the illusion of depth perception, hence adding a third dimension. 3D videos can effortlessly validate and secure the authenticity of communication and broadcast process due to their auxiliary effect. In this research paper we attempt to observe and analyze numerous measures taken towards initiation and rise of 3D videos along with their efficacy from an end user perspective.

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“…Each camera records the corresponding part of a 360 panorama, which are then mapped into one image. Afterwards, The image is projected into one of the commonly used types of projections, such as equirectangular projection, cubic projection or other [14]. The advantages and disadvantages of different projection types and the mechanisms for efficient streaming of the projected data have been a matter of several scientific works [15,16].…”

Section: Theoretical Background 21 Omnidirectional Video Streamingmentioning

confidence: 99%

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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Comparison of 3D 360-Degree Video Compression Performance Using Different Projections

Cited by 12 publications

References 7 publications

An Analysis on Pixel Redundancy Structure in Equirectangular Images

An Analysis on Pixel Redundancy Structure in Equirectangular Images

Emergence and Functionality of 3D Videos

Analysis of User Exploration Patterns during Scene Cuts in Omnidirectional Videos

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