2024/07/13 by Jinchi Chen, Chen, Jinchi
Engineering · Physics and Astronomy · #Adaptive optics and wavefront sensing #Advanced Optical Sensing Technologies #FOS: Computer and information sciences #Information Theory (cs.IT) #Optical Systems and Laser Technology
paper · pdf · doi:10.48550/arxiv.2407.09900
openalex publication_date 2024/07/13 · openalex created_date 2024/07/17 · openalex updated_date 2026/07/28
We address the problem of simultaneously recovering a sequence of point source signals from observations limited to the low-frequency end of the spectrum of their summed convolution, where the point spread functions (PSFs) are unknown. By exploiting the low-dimensional structures of the signals and PSFs, we formulate this as a low-rank matrix demixing problem. To solve this, we develop a scaled gradient descent method without balancing regularization. We establish theoretical guarantees under mild conditions, demonstrating that our method, with spectral initialization, converges to the ground truth at a linear rate, independent of the condition number of the underlying data matrices. Numerical experiments indicate that our approach is competitive with existing convex methods in terms of both recovery accuracy and computational efficiency.