Resolution Enhancement in Coherent Diffraction Imaging Using High Dynamic Range Image

Yuanyuan Liu,Qingwen Liu,Shuangxiang Zhao,Zuyuan He,Wenchen Sun,Bingxin Xu

doi:10.3390/photonics8090370

Yuanyuan Liu, Qingwen Liu + Show 4 more

Open Access

https://doi.org/10.3390/photonics8090370

Copy DOI

Journal: Photonics	Publication Date: Sep 2, 2021
Citations: 4	License type: CC BY 4.0

Affiliation: Shanghai Jiao Tong University

Abstract

In a coherent diffraction imaging (CDI) system, the information of the sample is retrieved from the diffraction patterns recorded by the image sensor via multiple iterations. The limited dynamic range of the image sensor restricts the resolution of the reconstructed sample information. To alleviate this problem, the high dynamic range imaging technology is adopted to increase the signal-to-noise ratio of the diffraction patterns. A sequence of raw diffraction images with differently exposure time are recorded by the image sensor. Then, they are fused to generate a high quality diffraction pattern based on the response function of the image sensor. With the fused diffraction patterns, the resolution of the coherent diffraction imaging can be effectively improved. The experiments on USAF resolution card is carried out to verify the effectiveness of our proposed method, in which the spatial resolution is improved by 1.8 times using the high dynamic range imaging technology.

Highlights

Coherent diffraction imaging (CDI) [1,2,3,4,5,6] is a promising phase retrieval technique that uses the intensity of diffraction patterns to recover the amplitude and phase distribution of the sample by iterative phase algorithm
Many researchers have proposed various modifications to improve the performance of coherent diffraction imaging (CDI) to meet requirements in different applications, including ptychographic iterative engine (PIE) [10,11,12,13], coherent modulation imaging [14,15,16], Fourier ptychographic microscopy [17,18], etc. [19,20,21]
To alleviate the above problem, we present the coherent diffraction imaging using high dynamic-range (HDR) imaging, which can improve the quality of the reconstructed image

Summary

Introduction

Coherent diffraction imaging (CDI) [1,2,3,4,5,6] is a promising phase retrieval technique that uses the intensity of diffraction patterns to recover the amplitude and phase distribution of the sample by iterative phase algorithm. [19,20,21] In those techniques, the diffraction patterns are usually recorded by a image sensor, and they are employed to reconstruct the complex amplitude distribution of sample. Due to the limitation of the dynamic range of the image sensor, they cannot provide a high signal-to-noise ratio to record the full diffraction information of the sample with a single exposure. The insufficiency of high-frequency information due to the limited dynamic range of image sensor will degrade the quality of the reconstructed image. To alleviate the above problem, we present the coherent diffraction imaging using high dynamic-range (HDR) imaging, which can improve the quality of the reconstructed image

Methods

Results

Conclusion