Research on Super-Resolution Scanning Imaging Method for Lensless with Dual-Line Array

被引：0
|
作者：
Tian D. [1 ]
Yu N.-M. [1 ]
Zhou G.-L. [1 ]
Li N. [1 ]
机构：
[1] School of Automation and Information Engineering, Xi’an University of Technology, Shaanxi, Xi’an
来源：
Tien Tzu Hsueh Pao/Acta Electronica Sinica | 2022年 / 50卷 / 10期
关键词：
coordinate transformation; dual-line array image sensor; image recon⁃ struction model; scanning image interpolation; scanning imaging model; super-resolution scanning imaging;
D O I：
10.12263/DZXB.20210946
中图分类号：
学科分类号：
摘要：
Aiming at the problems of the low resolution in lensless imaging systems and the reconstruction distortion in single-line array scanning imaging systems, a super-resolution scanning imaging method is proposed for lensless using a dual-line array image sensor. The cell’s velocity can be measured in real-time using the space-time displacement of the du⁃ al-line array, which provides accurate parameters for the reconstruction. Considering the system characteristics of optical wavelength, diffraction light path, cell sample flow rate, pixel size of the image sensor, tilt angle, and frame rate, the scan⁃ ning imaging model of the scanning imaging system is established. The factors affecting the imaging quality of the dual-line array are analyzed, and the image reconstruction model of the dual-line array scanning imaging system is established by co⁃ ordinate transformation and scanned image interpolation calculation. By synthesizing the two models and taking the strip pattern as the simulation object, the imaging characteristics are analyzed, and the feasibility and effectiveness of the dual-line array scanning imaging system are verified theoretically. The simulation results show that the spatial resolution of the scanning imaging system with a dual-line array is at least 2.8 times higher than that of the system with an area array, and the SSIM and PSNR are improved by 5%~15%. On this basis, a scanning imaging system for lensless with a dual-line array was built, and the microspheres, red blood cells, and white blood cells were used as test objects to test the system. The re⁃ sults show that the problems of the reconstruction distortion in single-line array scanning imaging systems can be solved with a dual-line array scanning imaging. The mean diameter error of 20 μm microsphere is 2.04% between the scanning im⁃ aging system with dual-line array and the area array imaging system, and the characteristics of red blood cells and white blood cells are more obvious under the scanning imaging system with the dual-line array. © 2022 Chinese Institute of Electronics. All rights reserved.
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页码：2503 / 2516
页数：13
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