% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@INPROCEEDINGS{Bangun:1049747,
      author       = {Bangun, Arya and Baumeister, Paul F. and Clausen, Alexander
                      and Weber, Dieter},
      title        = {{N}o more shots in the dark - {H}ighly efficient
                      compression basis for live ptychography},
      reportid     = {FZJ-2025-05531},
      year         = {2025},
      abstract     = {The field of electron microscopy (EM) will soon be a
                      hundred years old.However, advances in aberration correction
                      have improved transmission EM during the last two
                      decades.Single atoms can now become visible.We can move the
                      electron beam focus over a sample to get scanning
                      transmission electron microscopy (STEM) data.Then, a
                      2D-array of scan points come in sequentially, while each
                      scan point is a 2D diffraction image, hence are called
                      4D-STEM data sets.The Wigner distribution deconvolution
                      method (WDD) allows to visualize a real-space representation
                      of the sample.However, WDD with full images is costly and
                      has so far been performed as a postprocessing step only.A
                      viable alternative is data compression on the diffraction
                      images.Various methods of dimensionality reduction have been
                      tried.Our approach is to use the circular harmonic
                      oscillator (CHO) basis for three reasons:(1) The CHO basis
                      has been found to be highly efficient in compressing typical
                      2D diffraction images while suppressing statistical
                      noise.(2) The factorizable property of the Cartesian
                      representation of a CHO basis allows for CHO basis
                      transformations using a two-step scheme of efficient
                      matrix-matrix multiplications with SGEMM.(3) The WDD
                      procedure can skip two Fourier transforms due to an
                      analytical property of the CHO basis.Combining the three
                      aspects of acceleration LiberTEM-live can visualize 4D-STEM
                      data using CHO-WDD in milliseconds on a GPU, even on
                      incomplete scans.This allows EM operators to finally see
                      what they measure while the scan is still running.},
      month         = {May},
      date          = {2025-05-27},
      organization  = {Retreat of the Institute for Advanced
                       Simulation, Jülich (Germany), 27 May
                       2025 - 27 May 2025},
      subtyp        = {After Call},
      cin          = {JSC / IAS-8 / ER-C-1 / ER-C},
      cid          = {I:(DE-Juel1)JSC-20090406 / I:(DE-Juel1)IAS-8-20210421 /
                      I:(DE-Juel1)ER-C-1-20170209 / I:(DE-Juel1)ER-C-20211020},
      pnm          = {5111 - Domain-Specific Simulation $\&$ Data Life Cycle Labs
                      (SDLs) and Research Groups (POF4-511)},
      pid          = {G:(DE-HGF)POF4-5111},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/1049747},
}