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Received：31 December 2020，
Revised：2021-1-12，
Accepted：19 January 2021，
Published：16 June 2021
移动端阅览
视频处理与压缩是多媒体计算与通信领域的核心主题之一，是连接视频采集传输和视觉分析理解的关键桥梁，也是诸多视频应用的基础。当前“5G+超高清+AI”正在引发多媒体计算与通信领域的新一轮重大技术革新，视频处理与压缩技术正在发生深刻变革，亟需建立视频大数据高效紧凑表示理论和方法。为此，学术研究机构和工业界对视频大数据的视觉表示机理、视觉信息紧凑表达、视频信号重建与恢复、高层与低层视觉融合处理方法及相应硬件技术等前沿领域进行了广泛深入研究。本文从数字信号处理基础理论出发，分析了当前视频处理与压缩领域的热点问题和研究内容，包括基于统计先验模型的视频数据表示模型及处理方法、融合深度网络模型的视频处理技术、视频压缩技术以及视频压缩标准进展等领域。详细描述了视频超分辨率、视频重建与恢复、视频压缩技术等领域面临的前沿动态、发展趋势、技术瓶颈和标准化进程等内容，对国际国内研究内容和发展现状进行了综合对比与分析，并展望了视频处理与压缩技术的发展与演进方向。更高质量视觉效果和高效率视觉表达之间将不再是单独研究的个体，融合类脑视觉系统及编码机理的视频处理与压缩技术将是未来研究的重要领域之一。
Video processing and compression are the most fundamental research areas in multimedia computing and communication technologies. They play a significant role in bridging video acquisition
video streaming
and video delivery together with the visual information analysis and visual understanding. Video processing and compression are also the foundations of applicational multimedia technologies and support various down-stream video applications. Digital videos are the largest big data in our contemporary modern society. The multimedia industry is the core component of the intellectual information era. The human kind steps into the intellectual information era with the continuous development of artificial intelligence and new generation of information revolution. Many emerging interdisciplinary research topics interact and fuse. Currently
the 5G plus ultra-high definition plus artificial intelligence invokes a novel trend of massive technology revolution in the context of multimedia computing and communication. The video processing and compression techniques also face challenging and intensive reform given this background. The demands for the theoretical and applicational breakthrough research on the compact video data representations
the highly efficient processing pipelines
and the high-performance algorithms are increasing. To address these issues
the academic and industrial society have already made extensive contributions and studies into several cutting-edge research areas and contents
including visual signal representation mechanism of video big data
compact visual information expression
video signal restoration and reconstruction
high-level and low-level vision fusion methods
and their hardware implementations. Based on fundamental theories in discrete signal processing
the active research topics as well as the corresponding state-of-the-art methodologies in the field of video processing and compression are systematically reviewed and analyzed. A comprehensive review of research topics
namely
statistical prior model-based video data representation learning and its processing methods
deep network-based video processing and compression solutions
video coding techniques
and video compression standardization process is provided. More importantly
the challenges of these research areas
the future developing tendency
the state-of-the-art approach as well as the standardization process are also provided from top to bottom. Specifically
the video processing algorithms
including model-based and deep learning based video super-resolution and video restoration solutions are initially reviewed. The video super-resolution contains spatial super-resolution and temporal super-resolution methods. The video restoration focuses on video deblurring and video deraining. The prior model based approaches and neural approaches are reviewed and compared. Subsequently
this paper presents the review of video compression methods from two aspects
namely
conventional coding tool development and learning-based video coding approaches. The former focuses on the modular improvements on predictive coding
transform and quantization
filtering
and entropy coding. With the development of multiple next-generation video coding standards
the scope and depth for the coding tool research in conventional hybrid coding framework are extensively broadened. The latter introduces the deep learning based video coding methods
not only for hybrid coding framework but also for end-to-end coding framework. Deep neural network based coding would definitely become the next jump of high-dimensional multimedia signal coding. For both parts
the detailed technology and standardization are described to shape the overall development of video compression. In addition
the extensive comparative study on these areas between oversea community and domestic community is conducted and analyzed
providing the evidence for the difference and similarity in the current situation. Finally
the future work on theoretical and application studies in video processing and compression is envisioned. In particular
the research between high quality visual effects and high efficiency visual representation would not be separate areas. The fusion of brain-like visual system and encoding mechanism for video processing and compression is a key direction of future research.
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