Search Results for author: Ivan W. Selesnick

Found 9 papers, 1 papers with code

Multichannel sleep spindle detection using sparse low-rank optimization

1 code implementation Journal of Neuroscience Methods Volume 288 2017 Ankit Parekha, Ivan W. Selesnick, Ricardo S.Osorio, Andrew W. Vargad, David M. Rapoport, Indu Ayappa

Using a non-linear signal model, which assumes the input EEG to be the sum of a transient and an oscillatory component, we propose a multichannel transient separation algorithm.

EEG Spindle Detection

Improved Sparse Low-Rank Matrix Estimation

no code implementations29 Apr 2016 Ankit Parekh, Ivan W. Selesnick

Further, we show how to set the parameters of the non-convex penalty functions, in order to ensure that the objective function is strictly convex.

Denoising

Enhanced Low-Rank Matrix Approximation

no code implementations6 Nov 2015 Ankit Parekh, Ivan W. Selesnick

This letter proposes to estimate low-rank matrices by formulating a convex optimization problem with non-convex regularization.

Image Denoising

Sparsity-based Correction of Exponential Artifacts

no code implementations24 Sep 2015 Yin Ding, Ivan W. Selesnick

This paper describes an exponential transient excision algorithm (ETEA).

EEG Time Series +1

Convex Denoising using Non-Convex Tight Frame Regularization

no code implementations4 Apr 2015 Ankit Parekh, Ivan W. Selesnick

To more accurately estimate non-zero values, we propose the use of a non-convex regularizer, chosen so as to ensure convexity of the objective function.

Denoising

Image Restoration using Total Variation with Overlapping Group Sparsity

no code implementations13 Oct 2013 Jun Liu, Ting-Zhu Huang, Ivan W. Selesnick, Xiao-Guang Lv, Po-Yu Chen

Usually, the high-order total variation (HTV) regularizer is an good option except its over-smoothing property.

Image Restoration

Group-Sparse Signal Denoising: Non-Convex Regularization, Convex Optimization

no code implementations23 Aug 2013 Po-Yu Chen, Ivan W. Selesnick

Convex optimization with sparsity-promoting convex regularization is a standard approach for estimating sparse signals in noise.

Denoising Speech Enhancement

Translation-Invariant Shrinkage/Thresholding of Group Sparse Signals

no code implementations29 Mar 2013 Po-Yu Chen, Ivan W. Selesnick

This paper addresses signal denoising when large-amplitude coefficients form clusters (groups).

Blocking Denoising +2

Sparse Signal Estimation by Maximally Sparse Convex Optimization

no code implementations22 Feb 2013 Ivan W. Selesnick, Ilker Bayram

For this purpose, this paper describes the design and use of non-convex penalty functions (regularizers) constrained so as to ensure the convexity of the total cost function, F, to be minimized.

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