Hyperspectral images exhibit strong spectral correlations, which can be exploited via a low-rankness and joint-sparsity prior when reconstructed from incomplete and noisy measurements. A state-of-the-art solution consists in using a regularization term based on both the l2,1 and the nuclear norms, which however does not scale well with large numbers of spectral channels and huge image sizes. To alleviate this issue, we propose a parallelizable faceted low-rankness and joint-sparsity prior to improve the scalability of the associated imaging algorithm while preserving its reconstruction performance and better promoting local spectral correlations. We illustrate our approach on synthetic data in the context of radio-astronomy.
|Publication status||Published - 2 Jul 2019|
|Event||Signal Processing with Adaptive Sparse Structured Representations (SPARS) workshop - Toulouse, France|
Duration: 1 Jul 2019 → 4 Jul 2019
|Workshop||Signal Processing with Adaptive Sparse Structured Representations (SPARS) workshop|
|Abbreviated title||SPARS 2019|
|Period||1/07/19 → 4/07/19|
Thouvenin, P-A., Abdulaziz, A., Jiang, M., Repetti, A., & Wiaux, Y. (2019). A faceted prior for scalable wideband computational imaging. Abstract from Signal Processing with Adaptive Sparse Structured Representations (SPARS) workshop, Toulouse, France.