Virtual reality (VR) has huge potential to enable radically new applications, behind which spherical panoramic video processing is one of the backbone techniques. However, current VR systems reuse the techniques designed for processing conventional planar videos, resulting in significant energy inefficiencies. Our characterizations show that operations that are unique to processing 360° VR content constitute 40% of the total processing energy consumption. We present EVR, an end-to-end system for energy-efficient VR video processing. EVR recognizes that the major contributor to the VR tax is the projective transformation (PT) operations. EVR mitigates the overhead of PT through two key techniques: semantic-aware streaming on the server and hardware-accelerated rendering on the client device. Real system measurements show that EVR reduces the energy of VR rendering by up to 58%, which translates to up to 42% energy saving for VR devices.

中文翻译：

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虚拟现实的节能视频处理

虚拟现实 (VR) 具有实现全新应用的巨大潜力，其背后的球面全景视频处理是骨干技术之一。然而，当前的 VR 系统重复使用为处理传统平面视频而设计的技术，从而导致显着的能源效率低下。我们的特征表明，处理 360° VR 内容所特有的操作占总处理能耗的 40%。我们展示了 EVR，这是一种用于节能 VR 视频处理的端到端系统。EVR 认识到 VR 税的主要贡献者是投影转换 (PT) 操作。EVR 通过两项关键技术减轻 PT 的开销：服务器上的语义感知流媒体和客户端设备上的硬件加速渲染。