Publication

Edge-adaptive l2 regularization image reconstruction from non-uniform Fourier data

(Top) Reconstruction comparison of SAR vehicle data and (right) AHOTV Reconstruction. A close up of the lower right tire.

Citation

Victor Churchill, Rick Archibald, Anne Gelb, 'Edge-adaptive l2 regularization image reconstruction from non-uniform Fourier data', arXiv:1811.08487, 2018

Abstract

Total variation regularization based on the l1 norm is ubiquitous in image reconstruction. However, the resulting reconstructions are not always as sparse in the edge domain as desired. Iteratively reweighted methods provide some improvement in accuracy, but at the cost of extended runtime. In this paper we examine these methods for the case of data acquired as non-uniform Fourier samples. We then develop a non-iterative weighted regularization method that uses a pre-processing edge detection to find exactly where the sparsity should be in the edge domain. We show that its performance in terms of both accuracy and speed has the potential to outperform reweighted TV regularization methods.

Read Publication