Journal ArticleDOI
Multiple description vector quantization with a coarse lattice
TLDR
This work alters the encoding of multiple description lattice vector quantization technique to improve performance without a significant increase in complexity by replacing the fine lattice codebook with a nonlattice code book that respects many of the symmetries of the coarse lattice.Abstract:
A multiple description (MD) lattice vector quantization technique for two descriptions was previously introduced in which fine and coarse codebooks are both lattices. The encoding begins with quantization to the nearest point in the fine lattice. This encoding is an inherent optimization for the decoder that receives both descriptions; performance can be improved with little increase in complexity by considering all decoders in the initial encoding step. The altered encoding relies only on the symmetries of the coarse lattice. This allows us to further improve performance without a significant increase in complexity by replacing the fine lattice codebook with a nonlattice codebook that respects many of the symmetries of the coarse lattice. Examples constructed with the two-dimensional (2-D) hexagonal lattice demonstrate large improvement over time sharing between previously known quantizers.read more
Citations
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Journal ArticleDOI
Multiple description coding: compression meets the network
TL;DR: By allowing image reconstruction to continue even after a packet is lost, this type of representation can prevent a Web browser from becoming dormant, and the source can be approximated from any subset of the chunks.
Journal ArticleDOI
Coding Algorithms for 3DTV—A Survey
Aljosa Smolic,Karsten Mueller,Nikolce Stefanoski,J. Ostermann,Atanas Gotchev,Gozde Bozdagi Akar,G. Triantafyllidis,Alper Koz +7 more
TL;DR: 3DTV coding technology is maturating, however, the research area is relatively young compared to coding of other types of media, and there is still a lot of room for improvement and new development of algorithms.
Journal ArticleDOI
Lattices for Distributed Source Coding: Jointly Gaussian Sources and Reconstruction of a Linear Function
TL;DR: An inner bound to the optimal rate-distortion region is obtained by a scheme that reconstructs the linear function directly rather than reconstructing the individual components X 1 and X 2 first, which results in a better rate region for certain parameter values.
Journal ArticleDOI
Vector Gaussian Multiple Description With Individual and Central Receivers
Hua Wang,Pramod Viswanath +1 more
TL;DR: J jointly Gaussian descriptions are optimal in achieving the limiting rates and the robustness of this description scheme is shown: the distortions achieved are no larger when used to describe any non-Gaussian source with the same covariance matrix.
Journal ArticleDOI
Multiple Description Quantization Via Gram–Schmidt Orthogonalization
TL;DR: A systematic treatment of the El Gamal-Cover (EGC) achievable MD rate-distortion region is provided, and it can be decomposed into a simplified-EGC (SEGC) region and a superimposed refinement operation.
References
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Journal ArticleDOI
Quantization
Robert M. Gray,David L. Neuhoff +1 more
TL;DR: The key to a successful quantization is the selection of an error criterion – such as entropy and signal-to-noise ratio – and the development of optimal quantizers for this criterion.
Journal ArticleDOI
Multiple description coding: compression meets the network
TL;DR: By allowing image reconstruction to continue even after a packet is lost, this type of representation can prevent a Web browser from becoming dormant, and the source can be approximated from any subset of the chunks.
Journal ArticleDOI
Design of multiple description scalar quantizers
TL;DR: The design of scalar quantizers for communication systems that use diversity to overcome channel impairments is considered and a design algorithm, a generalization of S.P. Lloyd's (1962) algorithm, is developed.
Journal ArticleDOI
Asymptotically optimal block quantization
TL;DR: A heuristic argument generalizing Bennett's formula to block quantization where a vector of random variables is quantized is given, leading to a rigorous method for obtaining upper bounds on the minimum distortion for block quantizers.
Journal ArticleDOI
Achievable rates for multiple descriptions
Abbas El Gamal,Thomas M. Cover +1 more
TL;DR: These rates are shown to be optimal for deterministic distortion measures for random variables and Shannon mutual information.