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4 February 2019 Equatorial part segmentation model for 360-deg video projection
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The 360-deg or virtual reality video can capture all sides around the observer at the same time and provides the freedom to select any part of the surroundings for display using a head mounted display in the case of a single user or smart TV, curved screen, and even with video projectors placed in a 360-deg projection room in the case of multiusers. In order to encode these spherical videos with standard codecs, a projection step is necessary to transform the original 3-D space scene into a regular 2-D video sequence. Thus different geometric shapes can be used as equirectangular projection (ERP), cubemap projection (CMP), segmented sphere projection (SSP), etc. The proposed model presents the 360-deg video on eight square faces, six faces for the equatorial part, and two faces for the top and bottom views. This shape can ensure a better projection of the video thanks to the size ratio of the lateral faces, which is very close to the size ratio of televisions and video projectors used in 360-deg rooms. Quality metrics comparison shows average gains when compared with ERP and SSP models and the encoding time is hugely reduced when compared with CMP model.
© 2019 SPIE and IS&T 1017-9909/2019/$25.00 © 2019 SPIE and IS&T
Anas Jallouli, Fahmi Kammoun, and Nouri Masmoudi "Equatorial part segmentation model for 360-deg video projection," Journal of Electronic Imaging 28(1), 013019 (4 February 2019).
Received: 30 September 2018; Accepted: 3 January 2019; Published: 4 February 2019

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