将虚拟摄像机服务扩展到大量用户

V. Reddy, Ragnar Langseth, H. Stensland, C. Griwodz, P. Halvorsen, Dag Johansen
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引用次数: 3

摘要

通过处理来自相机阵列的视频片段,可以很容易地制作宽视场全景视频。从单个全景视频中,可以进一步生成多个虚拟摄像机,支持基于阵列中少数物理摄像机的大量用户的个性化视图。然而,为大量用户提供个性化服务可能会带来带宽和处理瓶颈,这取决于虚拟相机的处理位置。在本演示中,我们提出了一个系统,该系统解决了向最终用户传输整个全景视频的巨大成本,用户可以在客户端设备上创建虚拟视图。我们的方法是将全景划分为瓷砖,每个瓷砖都编码为多个品质。然后,全景视频贴片由客户端根据虚拟摄像机指向的位置以一定的质量(以及比特率)检索,也就是说,贴片的视频质量会根据用户交互动态变化。我们的初步实验表明,在不用于提取虚拟视图的全景帧区域的交易质量成本上,有很大的潜力可以节省带宽。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Scaling virtual camera services to a large number of users
By processing video footage from a camera array, one can easily make wide-field-of-view panorama videos. From the single panorama video, one can further generate multiple virtual cameras supporting personalized views to a large number of users based on only the few physical cameras in the array. However, giving personalized services to large numbers of users potentially introduces both bandwidth and processing bottlenecks, depending on where the virtual camera is processed. In this demonstration, we present a system that address the large cost of transmitting entire panorama video to the end-user where the user creates the virtual views on the client device. Our approach is to divide the panorama into tiles, each encoded in multiple qualities. Then, the panorama video tiles are retrieved by the client in a quality (and thus bit rate) depending on where the virtual camera is pointing, i.e., the video quality of the tile changes dynamically according to the user interaction. Our initial experiments indicate that there is a large potential of saving bandwidth on the cost of trading quality of in areas of the panorama frame not used for the extraction of the virtual view.
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