Open AccessFast digital lossy compression for X‐ray ptychographic data
Author(s) -
Huang Panpan,
Du Ming,
Hammer Mike,
Miceli Antonino,
Jacobsen Chris
Publication year - 2021
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577520013326
Subject(s) - lossy compression , optics , physics , detector , lossless compression , pixel , computer science , brightness , ptychography , quantization (signal processing) , data compression , diffraction , algorithm , artificial intelligence
Increases in X‐ray brightness from synchrotron light sources lead to a requirement for higher frame rates from hybrid pixel array detectors (HPADs), while also favoring charge integration over photon counting. However, transfer of the full uncompressed data will begin to constrain detector design, as well as limit the achievable continuous frame rate. Here a data compression scheme that is easy to implement in a HPAD's application‐specific integrated circuit (ASIC) is described, and how different degrees of compression affect image quality in ptychography, a commonly employed coherent imaging method, is examined. Using adaptive encoding quantization, it is shown in simulations that one can digitize signals up to 16383 photons per pixel (corresponding to 14 bits of information) using only 8 or 9 bits for data transfer, with negligible effect on the reconstructed image.