Learning to do multiframe wavefront sensing unsupervisedly: applications to blind deconvolution

TL;DR

This paper introduces an unsupervised deep learning approach for multiframe wavefront sensing and blind deconvolution, enabling faster, observation-only training applicable to astronomical imaging without complex simulations.

Contribution

It proposes a physically-motivated unsupervised training scheme for deep neural networks in multiframe blind deconvolution, eliminating the need for supervised datasets or simulations.

Findings

Successfully trained neural networks using only observational data.

Achieved near real-time image correction with significant speedup over traditional methods.

Demonstrated effectiveness on both stellar and solar telescope data.

Abstract

Observations from ground based telescopes are affected by the presence of the Earth atmosphere, which severely perturbs them. The use of adaptive optics techniques has allowed us to partly beat this limitation. However, image selection or post-facto image reconstruction methods applied to bursts of short-exposure images are routinely needed to reach the diffraction limit. Deep learning has been recently proposed as an efficient way to accelerate these image reconstructions. Currently, these deep neural networks are trained with supervision, so that either standard deconvolution algorithms need to be applied a-priori or complex simulations of the solar magneto-convection need to be carried out to generate the training sets. Our aim here is to propose a general unsupervised training scheme that allows multiframe blind deconvolution deep learning systems to be trained simply with observations. The approach can be applied for the correction of point-like as well as extended objects. Leveraging the linear image formation theory and a probabilistic approach to the blind deconvolution problem produces a physically-motivated loss function. The optimization of this loss function allows an end-to-end training of a machine learning model composed of three neural networks. As examples, we apply this procedure to the deconvolution of stellar data from the FastCam instrument and to solar extended data from the Swedish Solar Telescope. The analysis demonstrates that the proposed neural model can be successfully trained without supervision using observations only. It provides estimations of the instantaneous wavefronts, from which a corrected image can be found using standard deconvolution technniques. The network model is roughly three orders of magnitude faster than applying standard deconvolution based on optimization and shows potential to be used on real-time at the telescope.