hal-00716593, version 1
Greedy-Like Algorithms for the Cosparse Analysis Model
Abstract: The cosparse analysis model has been introduced recently as an interesting alternative to the standard sparse synthesis approach. A prominent question brought up by this new construction is the analysis pursuit problem -- the need to find a signal belonging to this model, given a set of corrupted measurements of it. Several pursuit methods have already been proposed based on $\ell_1$ relaxation and a greedy approach. In this work we pursue this question further, and propose a new family of pursuit algorithms for the cosparse analysis model, mimicking the greedy-like methods -- compressive sampling matching pursuit (CoSaMP), subspace pursuit (SP), iterative hard thresholding (IHT) and hard thresholding pursuit (HTP). Assuming the availability of a near optimal projection scheme that finds the nearest cosparse subspace to any vector, we provide performance guarantees for these algorithms. Our theoretical study relies on a restricted isometry property adapted to the context of the cosparse analysis model. We explore empirically the performance of these algorithms by adopting a plain thresholding projection, demonstrating their good performance.
- a – Technion
- b – INRIA
- 1:
- University of Haifa
- 2:
- CNRS : UMR6074 – INRIA – Institut National des Sciences Appliquées (INSA) - Rennes – Université de Rennes 1
- 3:
- University of Edinburgh
- Domain : Computer Science/Signal and Image Processing
Engineering Sciences/Signal and Image processing
Mathematics/Functional Analysis - Keywords : Sparse representations – Compressed sensing – Synthesis – Analysis – CoSaMP – Subspace-pursuit – Iterative hard threshodling – Hard thresholding pursuit.
- Available versions : v1 (2012-07-10) v2 (2013-01-18)
- hal-00716593, version 1
- http://hal.inria.fr/hal-00716593
- oai:hal.inria.fr:hal-00716593
- From:
- Submitted on: Tuesday, 10 July 2012 20:31:49
- Updated on: Tuesday, 10 July 2012 21:56:55




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