IEEE Trans Image Process - PET protection optimization for streaming scalable videos with multiple transmissions.

Tópicos

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Resumo

This paper investigates priority encoding transmission (PET) protection for streaming scalably compressed video streams over erasure channels, for the scenarios where a small number of retransmissions are allowed. In principle, the optimal protection depends not only on the importance of each stream element, but also on the expected channel behavior. By formulating a collection of hypotheses concerning its own behavior in future transmissions, limited-retransmission PET (LR-PET) effectively constructs channel codes spanning multiple transmission slots and thus offers better protection efficiency than the original PET. As the number of transmission opportunities increases, the optimization for LR-PET becomes very challenging because the number of hypothetical retransmission paths increases exponentially. As a key contribution, this paper develops a method to derive the effective recovery-probability versus redundancy-rate characteristic for the LR-PET procedure with any number of transmission opportunities. This significantly accelerates the protection assignment procedure in the original LR-PET with only two transmissions, and also makes a quick and optimal protection assignment feasible for scenarios where more transmissions are possible. This paper also gives a concrete proof to the redundancy embedding property of the channel codes formed by LR-PET, which allows for a decoupled optimization for sequentially dependent source elements with convex utility-length characteristic. This essentially justifies the source-independent construction of the protection convex hull for LR-PET.

Resumo Limpo

paper investig prioriti encod transmiss pet protect stream scalabl compress video stream erasur channel scenario small number retransmiss allow principl optim protect depend import stream element also expect channel behavior formul collect hypothes concern behavior futur transmiss limitedretransmiss pet lrpet effect construct channel code span multipl transmiss slot thus offer better protect effici origin pet number transmiss opportun increas optim lrpet becom challeng number hypothet retransmiss path increas exponenti key contribut paper develop method deriv effect recoveryprob versus redundancyr characterist lrpet procedur number transmiss opportun signific acceler protect assign procedur origin lrpet two transmiss also make quick optim protect assign feasibl scenario transmiss possibl paper also give concret proof redund embed properti channel code form lrpet allow decoupl optim sequenti depend sourc element convex utilitylength characterist essenti justifi sourceindepend construct protect convex hull lrpet

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