Ptychography is a coherent diffraction imaging method that uses phase retrieval techniques to reconstruct complex-valued images. It achieves this by sequentially illuminating overlapping regions of a sample with a coherent beam and recording the diffraction pattern. Although this addresses traditional imaging system challenges, it is computationally intensive and highly sensitive to noise, especially with reduced illumination overlap. Data-driven regularisation techniques have been applied in phase retrieval to improve reconstruction quality. In particular, plug-and-play (PnP) offers flexibility by integrating data-driven denoisers as implicit priors. In this work, we propose a half-quadratic splitting framework for using PnP and other data-driven priors for ptychography. We evaluate our method both on natural images and real test objects to validate its effectiveness for ptychographic image reconstruction.
@article{arxiv.2412.02548,
title = {Plug-and-Play Half-Quadratic Splitting for Ptychography},
author = {Alexander Denker and Johannes Hertrich and Zeljko Kereta and Silvia Cipiccia and Ecem Erin and Simon Arridge},
journal= {arXiv preprint arXiv:2412.02548},
year = {2024}
}