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- W2950895981 abstract "Consider a source that produces independent copies of a triplet of jointly distributed random variables, ${X_{i},Y_{i},Z_{i}}_{i=1}^{infty}$. The process ${X_{i}}$ is observed at the encoder, and is supposed to be reproduced at two decoders, where ${Y_{i}}$ and ${Z_{i}}$ are observed, in either a causal or non-causal manner. The communication between the encoder and the decoders is carried in two successive stages. In the first stage, the transmission is available to both decoders and the source is reconstructed according to the received bit-stream and the individual side information (SI). In the second stage, additional information is sent to both decoders and the source reconstructions are refined according to the transmissions at both stages and the available SI. It is desired to find the necessary and sufficient conditions on the communication rates between the encoder and decoders, so that the distortions incurred (at each stage) will not exceed given thresholds. For the case of non-degraded causal SI at the decoders, an exact single-letter characterization of the achievable region is derived for the case of pure source-coding. Then, for the case of communication carried over independent DMS's with random states known causally/non-causally at the encoder and with causal SI about the source at the decoders, a single-letter characterization of all achievable distortion in both stages is provided and it is shown that the separation theorem holds. Finally, for non-causal degraded SI, inner and outer bounds to the achievable rate-distortion region are derived. These bounds are shown to be tight for certain cases of reconstruction requirements at the decoders, thereby shading some light on the problem of successive refinement with non-degraded SI at the decoders." @default.
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- W2950895981 date "2008-12-17" @default.
- W2950895981 modified "2023-09-27" @default.
- W2950895981 title "On Successive Refinement for the Kaspi/Heegard-Berger Problem" @default.
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