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MPEG-4 based interactive video coding on parallel and distributed systems.

机译：在并行和分布式系统上基于MPEG-4的交互式视频编码。

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摘要

With the rapid convergence in telecommunications, computer, and TV/film industries, rigorous efforts are in progress for designing the emerging multimedia standard known as MPEG-4. The main features of MPEG-4 are its content-based interactivity, efficient coding, and universal access. Due to its content-based representation nature and flexible configuration structure, not only does an implementation of MPEG-4 have to support a large number of algorithms; it also needs to support flexibility to allow different usage of these algorithms as well as user interactions. Hardware-based approach seems to be very much application specific, and software-based implementation is a natural and viable option.; In this thesis, we proposed a software-based MPEG-4 video encoder which is implemented using an efficient parallel processing scheme on a cluster of workstations collectively working as a virtual machine. First, a hierarchical Petri nets based modeling methodology is proposed to capture the spatio-temporal relationships among multiple objects at different levels of an MPEG-4 video sequence as well as the user interactions. Second, we proposed a number of scheduling algorithms that allocate MPEG-4 objects to multiple workstations ensuring that the synchronization requirements among them are enforced, and presentation deadlines are met. Third, a dynamic partitioning scheme is proposed which divides an object among multiple workstations to extract additional parallelism. The scheme achieves load balancing among the workstations with a low overhead. The striking feature of our encoder is that it adjusts the allocation and partitioning of objects automatically according to the dynamic variations in the video object behavior. Various additional software optimization have been made to further speed up the computation.; The performance of the encoder can scale according to the number of workstations used. With 20 workstations, the encoder yields an real-time encoding rate on QCIF format video objects which demonstrates its potential to be used in a real system.
机译：随着电信，计算机和电视/电影行业的快速融合，正在努力设计新兴的MPEG-4多媒体标准。 MPEG-4的主要功能是基于内容的交互性，有效的编码和通用访问。由于其基于内容的表示性质和灵活的配置结构，MPEG-4的实现不仅必须支持大量算法，而且还必须支持多种算法。它还需要支持灵活性，以允许这些算法的不同用法以及用户交互。基于硬件的方法似乎是非常特定于应用程序的，而基于软件的实现是一种自然而可行的选择。在本文中，我们提出了一种基于软件的MPEG-4视频编码器，该编码器使用高效的并行处理方案在集体充当虚拟机的工作站集群上实现。首先，提出了一种基于层次Petri网的建模方法，以捕获MPEG-4视频序列不同级别上多个对象之间的时空关系以及用户交互。其次，我们提出了许多调度算法，这些算法将MPEG-4对象分配给多个工作站，以确保它们之间的同步要求得到满足，并且满足显示期限。第三，提出了一种动态分区方案，该方案在多个工作站之间划分对象以提取额外的并行性。该方案以较低的开销实现了工作站之间的负载平衡。我们的编码器的显着特点是，它根据视频对象行为的动态变化自动调整对象的分配和分区。已经进行了各种附加的软件优化，以进一步加快计算速度。编码器的性能可以根据所用工作站的数量来扩展。该编码器有20个工作站，可在QCIF格式的视频对象上产生实时编码率，从而证明了其在实际系统中使用的潜力。

著录项

  • 作者

    He, Yong.;

  • 作者单位

    Hong Kong University of Science and Technology (People's Republic of China).;

  • 授予单位 Hong Kong University of Science and Technology (People's Republic of China).;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 138 p.
  • 总页数 138
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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