Convex Optimization
Successive coding of correlated sources
IEEE Transactions on Information Theory
Failure of successive refinement for symmetric Gaussian mixtures
IEEE Transactions on Information Theory
Distortion-rate bounds for fixed- and variable-rate multiresolution source codes
IEEE Transactions on Information Theory
Sequential coding of correlated sources
IEEE Transactions on Information Theory
All sources are nearly successively refinable
IEEE Transactions on Information Theory
Universal multiresolution source codes
IEEE Transactions on Information Theory
Error exponents in scalable source coding
IEEE Transactions on Information Theory
Computation and analysis of the N-Layer scalable rate-distortion function
IEEE Transactions on Information Theory
Additive successive refinement
IEEE Transactions on Information Theory
Vector Gaussian Multiple Description With Individual and Central Receivers
IEEE Transactions on Information Theory
Hi-index | 754.84 |
The successive refinement problem is extended to vector sources where individual distortion constraints are posed on each vector component. For vector Gaussian sources with squared-error distortion, a single-letter rate-distortion characterization is inherited from the previously studied Gaussian multiple descriptions problem with covariance distortion constraints. Though this characterization is amenable to well-known numerical convex optimization techniques, an analytical solution is difficult to obtain in full generality even for 2-D sources. In this work, the special case of successive refinability is addressed analytically. Specifically, vector Gaussian sources are shown to be not successively refinable everywhere unlike scalar Gaussian sources. It is also shown that, for 2-D Gaussian sources, the rate loss at the second stage can be as high as 0.5 b/sample in a "degenerate" scenario corresponding to what is known as sequential coding of correlated sources. Finally, analysis of 2-D binary symmetric sources with Hamming distortion reveals that the behavior of these sources with respect to successive refinability exhibits remarkable similarity to their 2-D Gaussian counterparts.