Sparse recovery with coherent tight frames via analysis Dantzig selector and analysis LASSO

作者：Lin, Junhong; Li, Song^*

来源：Applied and Computational Harmonic Analysis, 2014, 37(1): 126-139.

DOI：10.1016/j.acha.2013.10.003

• l(1)-Analysis
• Restricted isometry property
• Sparse recovery
• Dantzig selector
• LASSO
• Gaussian noise
• Sparse noise

This article considers recovery of signals that are spaise or approximately sparse in terms of a (possibly) highly overcomplete and coherent tight frame from undersampled data corrupted with additive noise. We show that the properly constrained l(1)-analysis optimization problem, called analysis Dantzig selector, stably recovers a signal which is nearly sparse in terms of a tight frame provided that the measurement matrix satisfies a restricted isometry property adapted to the tight frame. As a special case, we consider the Gaussian noise. Further, under a sparsity scenario, with high probability, the recovery error from noisy data is within a log-like factor of the minimax risk over the class of vectors which are at most s sparse in terms of the tight frame. Similar results for the analysis LASSO are shown. The above two algorithms provide guarantees only for noise that is bounded or bounded with high probability (for example, Gaussian noise). However, when the underlying measurements are corrupted by sparse noise, these algorithms perform suboptimally. We propose new algorithms for reconstructing signals that are nearly sparse in terms of a tight frame in the presence of bounded noise combined with sparse noise, and present corresponding recovery guarantees. The analysis in this paper is based on the restricted isometry property adapted to a tight frame, which is a, natural extension to the standard restricted isometry property.

• 出版日期2014-7
• 单位浙江大学