A Generalized Cubemap for Encoding 360° VR Videos using Polynomial Approximation
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Date
2019
Authors
Journal Title
Journal ISSN
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Publisher
The Eurographics Association and John Wiley & Sons Ltd.
Abstract
360° VR videos provide users with an immersive visual experience. To encode 360° VR videos, spherical pixels must be mapped onto a two-dimensional domain to take advantage of the existing video encoding and storage standards. In VR industry, standard cubemap projection is the most widely used projection method for encoding 360° VR videos. However, it exhibits pixel density variation at different regions due to projection distortion. We present a generalized algorithm to improve the efficiency of cubemap projection using polynomial approximation. In our algorithm, standard cubemap projection can be regarded as a special form with 1st-order polynomial. Our experiments show that the generalized cubemap projection can significantly reduce the projection distortion using higher order polynomials. As a result, pixel distribution can be well balanced in the resulting 360° VR videos. We use PSNR, S-PSNR and CPP-PSNR to evaluate the visual quality and the experimental results demonstrate promising performance improvement against standard cubemap projection and Google's equi-angular cubemap.
Description
@article{10.1111:cgf.13843,
journal = {Computer Graphics Forum},
title = {{A Generalized Cubemap for Encoding 360° VR Videos using Polynomial Approximation}},
author = {Xiao, Jianye and Tang, Jingtao and Zhang, Xinyu},
year = {2019},
publisher = {The Eurographics Association and John Wiley & Sons Ltd.},
ISSN = {1467-8659},
DOI = {10.1111/cgf.13843}
}