publications

2023

1. 

   Modeling Off-Axis Diffraction with the Least-Sampling Angular Spectrum Method

   Haoyu Wei, Xin Liu, Xiang Hao, and 2 more authors

   Optica, Jul 2023

   Abstract Bib Paper Code Website

   We propose the Least-Sampling ASM that minimizes and unifies the sampling requirements for all types of input fields. Ultra-fast computations at ultra-large angles (35 degrees) are demonstrated. High-frequency modulation such as diffusers is also considered.

   @article{Wei:23,
     title = {Modeling Off-Axis Diffraction with the Least-Sampling Angular Spectrum Method},
     author = {Wei, Haoyu and Liu, Xin and Hao, Xiang and Lam, Edmund Y. and Peng, Yifan},
     journal = {Optica},
     volume = {10},
     number = {7},
     pages = {959--962},
     publisher = {Optica Publishing Group},
     year = {2023},
     month = jul,
     doi = {10.1364/OPTICA.490223},
   }

2. 

   Millisecond Autofocusing Microscopy Using Neuromorphic Event Sensing

   Zhou Ge, Haoyu Wei, Feng Xu, and 4 more authors

   Optics and Lasers in Engineering, Jul 2023

   Abstract Bib

   Rapid autofocusing is essential for many microscopic imaging applications. Existing methods either require complicated hardware implementations or slow -stack image acquisition. In this work, we develop a new approach to achieve fast autofocusing using the neuromorphic event sensing technology, which detects the sparse brightness changes asynchronously and responds quickly to the specimen movement. A simple yet efficient autofocusing system is tailored for fast acquisition and processing of the non-redundant event data, allowing for autofocusing in only tens of milliseconds, which is thousands of times faster than current technologies. Experimental results show a substantial performance improvement and capability for biopsy specimen inspections. To the best of our knowledge, this is the first reported work on a neuromorphic methodology for autofocusing microscopy.

   @article{ge:2023:millisecond,
     title = {Millisecond Autofocusing Microscopy Using Neuromorphic Event Sensing},
     author = {Ge, Zhou and Wei, Haoyu and Xu, Feng and Gao, Yizhao and Chu, Zhiqin and So, Hayden K-H and Lam, Edmund Y},
     journal = {Optics and Lasers in Engineering},
     volume = {160},
     pages = {107247},
     year = {2023},
     publisher = {Elsevier},
     html = {https://www.sciencedirect.com/science/article/abs/pii/S0143816622003001}
   }

2022

1. 

   Event-Based Automatic Focusing Under Photon-Limited Conditions

   Zhou Ge, Haoyu Wei, and Edmund Y Lam

   In Computational Optical Sensing and Imaging, Jul 2022

   Bib

   @inproceedings{ge:2022:event,
     title = {Event-Based Automatic Focusing Under Photon-Limited Conditions},
     author = {Ge, Zhou and Wei, Haoyu and Lam, Edmund Y},
     booktitle = {Computational Optical Sensing and Imaging},
     pages = {CM4A--2},
     year = {2022},
     organization = {Optica Publishing Group},
   }

2020

1. 

   2-Step Sparse-View CT Reconstruction with a Domain-Specific Perceptual Network

   Haoyu Wei, Florian Schiffers, Tobias Würfl, and 4 more authors

   arXiv, Jul 2020

   Abstract arXiv Bib Code

   Reconstruction of Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) images using highly undersampled data.

   @article{wei:2020:2,
     title = {2-Step Sparse-View CT Reconstruction with a Domain-Specific Perceptual Network},
     author = {Wei, Haoyu and Schiffers, Florian and W{\"u}rfl, Tobias and Shen, Daming and Kim, Daniel and Katsaggelos, Aggelos K and Cossairt, Oliver},
     journal = {arXiv},
     year = {2020},
   }