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Paper Abstract and Keywords
Presentation 2021-02-18 15:15
A study on avoiding phase-retrieval stagnation for ptychography
Ryo Ozawa (Muroran IT), Yosuke Maehara (DOWELL), Asahi Takaoka, Hiroyuki Shioya (Muroran IT)
Abstract (in Japanese) (See Japanese page) 
(in English) Diffractive imaging is a method of reconstructing an image from an observed diffraction pattern, in which a computer substitutes the function of lenses. By irradiating an object with radiation or electron beam, the Fourier intensity of the object is observed, but not the Fourier phase. Therefore, GS algorithm has been used to retrieve the Fourier phase. The algorithm repeats imposition of real / inverse constraints and Fourier transform. Ptychography enables imaging of objects which are larger than the beam diameter and complex objects. This method retrieves Fourier phases in multiple regions of an object with each observed Fourier intensity if the overlap ratio is sufficient. However, when the overlap ratio is insufficient, retrieving Fourier phase is stagnant. In this paper, we propose a local search method on ptychography to avoid the stagnation.
Keyword (in Japanese) (See Japanese page) 
(in English) Diffractive imaging / Ptychography / Complex phase retrieval / / / / /  
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Conference Information
Conference Date 2021-02-18 - 2021-02-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Image Processing, etc. 
Paper Information
Registration To IEICE-IE 
Conference Code 2021-02-IE-ITS-MMS-ME-AIT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A study on avoiding phase-retrieval stagnation for ptychography 
Sub Title (in English)  
Keyword(1) Diffractive imaging  
Keyword(2) Ptychography  
Keyword(3) Complex phase retrieval  
1st Author's Name Ryo Ozawa  
1st Author's Affiliation Muroran Institute of Technology (Muroran IT)
2nd Author's Name Yosuke Maehara  
2nd Author's Affiliation DOWELL Corporation (DOWELL)
3rd Author's Name Asahi Takaoka  
3rd Author's Affiliation Muroran Institute of Technology (Muroran IT)
4th Author's Name Hiroyuki Shioya  
4th Author's Affiliation Muroran Institute of Technology (Muroran IT)
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Speaker Author-1 
Date Time 2021-02-18 15:15:00 
Presentation Time 25 minutes 
Registration for IEICE-IE 
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Volume (vol) vol.45 
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