Control structure efficiency enhancement for predictive video coding

R. Wright, E. Keenan, M. Mannucci, M. Rajan, T. Hanratty, J. Dumer
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引用次数: 1

Abstract

Summary form only given. To achieve superior video compression performance it is generally necessary to base the encoding decisions on a local scale, instead of the traditional frame-by-frame approach. Partitioning schemes for optimal frame subdivision have been proposed. Unfortunately, a full local approach that leads to inhomogeneous partitioning of the frame encounters the serious problem of dealing with an increase of side information, particularly in the area of very low bit-rate compression where a relatively large overhead can possibly erode the benefits of the local analysis. Our approach adopts a moderate position, which can still retain some of the advantages of variable block size while keeping the overhead to a bare minimum. The idea is to subdivide a frame in a fixed number of square panels that we call "megablocks." All decisions relative to intra (I) or inter (P) coding are made at the megablock level. These decisions pertain to motion block size and degree of error quantization in the P-mode as well as vector and scalar quantization of subbands in the I-mode. The key to the improved performance of the megablock partitioning scheme is the joint cost minimization of motion field and quantized error information. In very low bit rate video coding, the cost of transmitting motion vectors consumes a significant fraction of the total bit budget. The megablock structure permits the use of variable size motion blocks without incurring the cost associated with motion segmentation or a full quadtree approach.
预测视频编码控制结构效率的提高
只提供摘要形式。为了获得优异的视频压缩性能,通常需要基于局部尺度的编码决策,而不是传统的逐帧方法。提出了最优帧细分的划分方案。不幸的是,导致帧非均匀分区的全局部方法遇到了处理侧信息增加的严重问题,特别是在非常低比特率压缩的领域,相对较大的开销可能会侵蚀局部分析的好处。我们的方法采用了一个适中的位置,它仍然可以保留可变块大小的一些优点,同时将开销保持在最低限度。这个想法是将一个框架细分为固定数量的方形面板,我们称之为“兆锁”。所有与intra (I)或inter (P)编码相关的决策都是在兆锁级别上做出的。这些决定与运动块大小和p模式中的误差量化程度以及i模式中子带的矢量和标量量化有关。超大锁分区方案性能提升的关键在于运动场的代价最小化和误差信息的量化。在非常低比特率的视频编码中,传输运动矢量的成本消耗了总比特预算的很大一部分。megablock结构允许使用可变大小的运动块,而不会产生与运动分割或全四叉树方法相关的成本。
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