Publications [#264995] of Guillermo Sapiro

Papers Published

1. Mairal, J; Sapiro, G; Elad, M, Multiscale sparse image representation with learned dictionaries, Proceedings International Conference on Image Processing Icip, vol. 3 (December, 2006), pp. III105-III108, IEEE, ISSN 1522-4880 [doi]
   (last updated on 2025/12/31)

   Abstract:
   This paper introduces a new framework for learning multiscale sparse representations of natural images with overcomplete dictionaries. Our work extends the K-SVD algorithm [1], which learns sparse single-scale dictionaries for natural images. Recent work has shown that the K-SVD can lead to state-of-the-art image restoration results [2, 3]. We show that these are further improved with a multiscale approach, based on a Quadtree decomposition. Our framework provides an alternative to multiscale pre-defined dictionaries such as wavelets, curvelets, and contourlets, with dictionaries optimized for the data and application instead of pre-modelled ones. © 2007 IEEE.