Volumetric video, which offers immersive viewing experiences, is gaining increasing prominence. With its six degrees of freedom, it provides viewers with greater immersion and interactivity compared to traditional videos. Despite their potential, volumetric video services poses significant challenges. This survey conducts a comprehensive review of the existing literature on volumetric video. We firstly provide a general framework of volumetric video services, followed by a discussion on prerequisites for volumetric video, encompassing representations, open datasets, and quality assessment metrics. Then we delve into the current methodologies for each stage of the volumetric video service pipeline, detailing capturing, compression, transmission, rendering, and display techniques. Lastly, we explore various applications enabled by this pioneering technology and we present an array of research challenges and opportunities in the domain of volumetric video services. This survey aspires to provide a holistic understanding of this burgeoning field and shed light on potential future research trajectories, aiming to bring the vision of volumetric video to fruition.

翻译：体积视频能够提供沉浸式的观看体验，正日益受到重视。凭借其六自由度特性，与传统视频相比，它能赋予观看者更强的沉浸感和交互性。尽管潜力巨大，但体积视频服务也带来了显著的技术挑战。本综述对现有体积视频文献进行了全面回顾。我们首先提出了体积视频服务的通用框架，随后讨论了体积视频的先决条件，涵盖表示方法、公开数据集及质量评估指标。接着，我们深入探讨了体积视频服务流程各阶段的当前方法论，详细阐述了捕获、压缩、传输、渲染与显示技术。最后，我们探索了这项前沿技术所支持的各种应用，并呈现了体积视频服务领域的一系列研究挑战与机遇。本综述旨在全面理解这一新兴领域，并阐明未来潜在的研究方向，以推动实现体积视频的愿景。