Preprint

PUBDB-2023-05638

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Live Iterative Ptychography with projection-based algorithms

Welker, S. (Corresponding author)CFEL* ; Peer, T. ; Chapman, H. N.CFEL*XFEL.EU*DESY* ; Gerkmann, T.

2023

This record in other databases:

Report No.: arXiv:2309.08639

Abstract: In this work, we demonstrate that the ptychographic phase problem can be solved in a live fashion during scanning, while data is still being collected. We propose a generally applicable modification of the widespread projection-based algorithms such as Error Reduction (ER) and Difference Map (DM). This novel variant of ptychographic phase retrieval enables immediate visual feedback during experiments, reconstruction of arbitrary-sized objects with a fixed amount of computational resources, and adaptive scanning. By building upon the Real-Time Iterative Spectrogram Inversion (RTISI) family of algorithms from the audio processing literature, we show that live variants of projection-based methods such as DM can be derived naturally and may even achieve higher-quality reconstructions than their classic non-live counterparts with comparable effective computational load.

Note: Submission for IEEE conference (may affect copyright)

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Contributing Institute(s):

1. FS-CFEL-1 (Group Leader: Henry Chapman) (CFEL-I)
2. CFEL-Coherent X-Ray Imaging (FS-CFEL-1)

Research Program(s):

1. 633 - Life Sciences – Building Blocks of Life: Structure and Function (POF4-633) (POF4-633)
2. DFG project 390715994 - EXC 2056: CUI: Advanced Imaging of Matter (390715994) (390715994)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2023

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