Iterative phase retrieval without support

J. S. Wu, Uwe Weierstall, John Spence, C. T. Koch

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


An iterative phase retrieval method for nonperiodic objects has been developed from the charge-f lipping algorithm proposed in crystallography. A combination of the hybrid input–output (HIO) algorithm and the f lipping algorithm has greatly improved performance. In this combined algorithm the f lipping algorithm serves to find the support (object boundary) dynamically, and the HIO part improves convergence and moves the algorithm out of local minima. It starts with a single intensity measurement in the Fourier domain and does not require a priori knowledge of the support in the image domain. This method is suitable for general image recovery from oversampled diffuse elastic x-ray and electron-diffraction intensities. The relationship between this algorithm and the output–output algorithm is elucidated.

Original languageEnglish (US)
Pages (from-to)2737-2739
Number of pages3
JournalOptics Letters
Issue number23
StatePublished - Dec 1 2004

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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