System, Algorithms, and Designs of View-Optimized Zoom for 360 degree Video

摘要

The present disclosure relates to systems and methods for streaming a tiled representation of video content based on a viewing direction and desired zoom level. Example methods include receiving information indicative of a view direction and a zoom level. The view direction and the zoom level correspond to a field of view including a first portion of the video content. A second portion of the video content is outside of the field of view. The method also includes selecting, from a plurality of viewports, an active viewport corresponding to the first portion of the video content. The active viewport specifies a set of one or more active tiles of a tiled representation of the video content. The method additionally includes comparing the set of one or more active tiles with a set of one or more previous active tiles and causing streaming and rendering to stop with respect to previous active tiles that are not in the set of one or more active tiles. The method includes causing streaming and rendering to commence with respect to active tiles that are not in the set of one or more previously active tiles.