Journal of University of Science and Technology of China ›› 2020, Vol. 50 ›› Issue (4): 418-427.DOI: 10.3969/j.issn.0253-2778.2020.04.005

• Original Paper • Previous Articles     Next Articles

A modified coherent diffraction algorithm based on the total variation algorithm for insufficient data

  

  1. JIANG Qi, LIU Jianhong, GUAN Yong, BAI Haobo, LIU Gang, TIAN Yangchao
  • Received:2019-05-21 Revised:2019-06-22 Accepted:2019-06-22 Online:2020-04-30 Published:2019-06-22
  • Contact: TIAN Yangchao
  • About author:JIANG Qi, male, born in 1994, master. Research field: Coherent diffraction imaging. E-mail: jqi1994@mail.ustc.edu.cn
  • Supported by:
    Supported by National Key Research and Development Project of China (2017YFA0402904, 2016YFA0400902), National Natural Science Foundation of China (11475175, 11405175, 11275204,11775224).

Abstract: X-ray coherent diffraction imaging (CDI) is a lensless imaging technology. Its basic principle is to illuminate an isolated sample with a highly coherent X-ray beam, then collect the information of the coherent diffraction pattern in the far field, and last restore the real structure information of the sample from the diffraction pattern by using the the CDI algorithm. Due to the limitation of experimental technology experimental data are usually defective, thus tolerance to noise and missing data is an important indicator for the CDI algorithm. Here a modified coherent diffraction algorithm by adding the total variation (TV) constraint into the CDI reconstruction algorithm was developed to improve the tolerance to noise and missing data. Then the performance of the modified coherent diffraction algorithm based on the total variation algorithm was verified using simulation data and experimental data. The results show the modified algorithm can accelerate convergence and improve the tolerance to noise and missing data.

Key words: coherent diffraction imaging, total variation, missing data, noise, constraint

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