Open-Source Phase Retrieval

• Suite of phase retrieval algorithms, including iterative DPC, ptychograpy, and parallax (tc-BF)
• User-friendly, object-oriented code
  • Check out our tutorial notebooks and recent preprint arXiv:2309.05250!

Differential Phase Contrast

  dpc = py4DSTEM.process.phase.DPCReconstruction(
     datacube=dataset,
     energy = 300e3, # eV
  ).preprocess(
  ).reconstruct(
  ).visualize(
  )

Parallax (tc-BF)

parallax = py4DSTEM.process.phase.ParallaxReconstruction(
      datacube=dataset,
      energy = 300e3, # eV
  ).preprocess(
      edge_blend=8, # pixels
  ).reconstruct(
      regularize_shifts=True,
      running_average=True,
  ).visualize(
  )

Ptychography

  ptycho = SingleslicePtychographicReconstruction(
      datacube=dataset,
      energy = 300e3, # eV
      semiangle_cutoff = 21.4, # mrad
  ).preprocess(
      fit_function = "plane", # de-scan correction
  ).reconstruct(
      max_iter = 8,
      step_size = 0.5,
      gaussian_filter_sigma = 0.3, # A
  ).visualize(
  )