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Data Compression Conference (DCC'06)
Encoding the \ell_p Ball from Limited Measurements
Snowbird, Utah
March 28-March 30
ISBN: 0-7695-2545-8
Emmanuel Candes, Caltech
, Justin Romberg
We address the problem of encoding signals which are sparse, i.e. signals that are concentrated on a set of small support. Mathematically, such signals are modeled as elements in the \ell_p ball for some p 1. We describe a strategy for encoding elements of the \ell_p ball which is universal in that 1) the encoding procedure is completely generic, and does not depend on p (the sparsity of the signal), and 2) it achieves near-optimal minimax performance simultaneously for all p \le 1. What makes our coding procedure unique is that it requires only a limited number of nonadaptive measurements of the underlying sparse signal; we show that near-optimal performance can be obtained with a number of measurements that is roughly proportional to the number of bits used by the encoder. We end by briefly discussing these results in the context of image compression.
Citation:
Emmanuel Candes, , "Encoding the \ell_p Ball from Limited Measurements," dcc, pp.33-42, Data Compression Conference (DCC'06), 2006
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