| Presentation | 2021-02-18 A study on avoiding phase-retrieval stagnation for ptychography Ryo Ozawa, Yosuke Maehara, Asahi Takaoka, Hiroyuki Shioya, |
|---|---|
| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(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) |
| Keyword(in English) | Diffractive imaging / Ptychography / Complex phase retrieval |
| Paper # | ITS2020-31,IE2020-45 |
| Date of Issue | 2021-02-11 (ITS, IE) |
| Conference Information | |
| Committee | IE / ITS / ITE-MMS / ITE-ME / ITE-AIT |
|---|---|
| Conference Date | 2021/2/18(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Image Processing, etc. |
| Chair | Hideaki Kimata(NTT) / Tomotaka Wada(Kansai Univ.) / Kenji Machida(NHK) / Hiroyuki Arai(Nippon Inst. of Tech.) / Nobuhiko Mukai(Tokyo City Univ.) |
| Vice Chair | Kazuya Kodama(NII) / Keita Takahashi(Nagoya Univ.) / Yusuke Takatori(Kanagawa Inst. of Tech.) / Hiroyuki Hatano(Mie Univ.) / / Shogo Muramatsu(Niigata Univ.) / Hisaki Nate(Tokyo Polytechnic Univ.) |
| Secretary | Kazuya Kodama(KDDI Research) / Keita Takahashi(Nagoya Inst. of Tech.) / Yusuke Takatori(Univ. of Tokyo) / Hiroyuki Hatano(Akita Prefectural Univ.) / (Fukuoka Univ.) / Shogo Muramatsu(NHK) / Hisaki Nate(Hokkaido Univ.) |
| Assistant | Shunsuke Iwamura(NHK) / Shinobu Kudo(NTT) / Msataka Imao(Mitsubishi Electric) / Yanlei Gu(Ritsumeikan Univ.) / Kenshi Saho(Toyama Prefectural Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Image Engineering / Technical Committee on Intelligent Transport Systems Technology / Technical Group on Multi-media Storage / Technical Group on Media Engineering / Technical Group on Artistic Image Technology |
|---|---|
| Language | JPN |
| 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) |
| Date | 2021-02-18 |
| Paper # | ITS2020-31,IE2020-45 |
| Volume (vol) | vol.120 |
| Number (no) | ITS-363,IE-364 |
| Page | pp.pp.25-30(ITS), pp.25-30(IE), |
| #Pages | 6 |
| Date of Issue | 2021-02-11 (ITS, IE) |