arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0707.4597cs.ITmath.IT
收藏

边信息可分级信源编码

Side-information Scalable Source Coding

Chao Tian, Suhas N. Diggavi

摘要:

在这项工作中考虑边信息可缩放(SI可缩放)信源编码的问题,其中编码器构造渐进描述,使得具有高质量边信息的接收器将能够截断比特流并在率失真意义上重构,而具有低质量边信息的接收器将不得不接收另外的数据以便解码。我们提供了一般离散无记忆源的内部和外部边界。可实现的区域被示出为紧的情况下,任何一个解码器需要一个无损重建,以及与降级的确定性失真措施的情况下。此外,我们表明,可实现的区域和外部边界之间的差距可以有界的常数时,平方误差失真措施。完美的可伸缩编码的概念被引入作为两个阶段的Wyner-Ziv界上操作,并给出了必要和充分条件的源满足一个温和的支持条件。使用SI可伸缩编码和连续细化Wyner-Ziv编码作为基本构建块,为具有多个联合高斯边信息的重要二次高斯源提供了完整的表征,其中边信息质量不必沿着可伸缩编码顺序单调。当坏边信息为常数时,给出了具有汉明失真的双对称二进制信源的部分结果,其中一个外界严格紧于另一个外界.

英文摘要:

The problem of side-information scalable (SI-scalable) source coding is considered in this work, where the encoder constructs a progressive description, such that the receiver with high quality side information will be able to truncate the bitstream and reconstruct in the rate distortion sense, while the receiver with low quality side information will have to receive further data in order to decode. We provide inner and outer bounds for general discrete memoryless sources. The achievable region is shown to be tight for the case that either of the decoders requires a lossless reconstruction, as well as the case with degraded deterministic distortion measures. Furthermore we show that the gap between the achievable region and the outer bounds can be bounded by a constant when square error distortion measure is used. The notion of perfectly scalable coding is introduced as both the stages operate on the Wyner-Ziv bound, and necessary and sufficient conditions are given for sources satisfying a mild support condition. Using SI-scalable coding and successive refinement Wyner-Ziv coding as basic building blocks, a complete characterization is provided for the important quadratic Gaussian source with multiple jointly Gaussian side-informations, where the side information quality does not have to be monotonic along the scalable coding order. Partial result is provided for the doubly symmetric binary source with Hamming distortion when the worse side information is a constant, for which one of the outer bound is strictly tighter than the other one.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑