Fast digital lossy compression for X-ray ptychographic data

Panpan Huang, Ming Du, Mike Hammer, Antonino Miceli, Chris Jacobsenb*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)292-300
Number of pages9
JournalJournal of Synchrotron Radiation
StatePublished - Jan 1 2021


  • X-ray ptychography
  • lossy compression
  • pixel array detectors

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation
  • Radiation


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