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On the Role of the Refinement Layer in Multiple Description Coding and Scalable Coding

机译:细化层在多描述编码和可伸缩编码中的作用

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摘要

We clarify the relationship among several existing achievable multiple description rate-distortion regions by investigating the role of refinement layer in multiple description coding. Specifically, we show that the refinement layer in the El Gamal-Cover (EGC) scheme and the Venkataramani–Kramer–Goyal (VKG) scheme can be removed; as a consequence, the EGC region is equivalent to the EGC* region (an antecedent version of the EGC region) while the VKG region (when specialized to the 2-description case) is equivalent to the Zhang–Berger (ZB) region. Moreover, we prove that for multiple description coding with individual and hierarchical distortion constraints, the number of layers in the VKG scheme can be significantly reduced when only certain weighted sum rates are concerned. The role of refinement layer in scalable coding (a special case of multiple description coding) is also studied.
机译:通过研究细化层在多描述编码中的作用,我们阐明了几个现有的可实现的多描述率失真区域之间的关系。具体来说,我们表明可以删除El Gamal-Cover(EGC)方案和Venkataramani-Kramer-Goyal(VKG)方案中的细化层;结果,EGC区域等同于EGC *区域(EGC区域的前身版本),而VKG区域(专门针对2描述情况)等同于Zhang-Berger(ZB)区域。此外,我们证明了对于具有单个和分级失真约束的多描述编码,当仅考虑某些加权求和率时,可以显着减少VKG方案中的层数。还研究了细化层在可伸缩编码(多描述编码的特殊情况)中的作用。

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