Yashang Li; Guozhong Zhao
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11179/111790X/Image-denoising-and-enhancement-of-terahertz-passive-imaging/10.1117/12.2539884.short
The wavelength of the terahertz is between the infrared and the
microwave, and the photon energy is low, so it has great application prospects
in security inspection. In order to further improve the target resolution of
terahertz passive imaging system, A terahertz image enhancement method based on
a block matching and three-dimensional and weighted Schatten-p norm
minimization is proposed to improve the image resolution of terahertz passive
imaging system. It uses three-dimensional matched filtering to remove image
noise on the basis of mean filtering, and then adopts Lucy Richardson algorithm
and weighted Schatten-p norm minimization for image restoration. Finally, the
convolution filter is used to enhance image details and the background of the
image is subtracted by the edge detection. The method of paper significantly
enhances the image contrast and increases system resolution from 2cm to 1.5cm,
effectively improving system performance
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Guozhong Zhao, Jiayi Yu, Yashang Li, Jia Wang,
http://www.sciencepublishinggroup.com/journal/paperinfo?journalid=302&doi=10.11648/j.ijass.20170505.12
The progress on terahertz imaging at Capital Normal University in Beijing is presented. Our works on Terahertz Imaging include the active and passive imaging. For the active terahertz imaging, the pulse and continue wave terahertz imaging are studied, respectively. The active terahertz pulse imaging is based on the terahertz time-domain spectroscopy (THz-TDS). A practical focus-plane imaging system is built up based on the THz-TDS with the probe-beam-expanded electro-optical sampling and an infrared CCD imaging. The active terahertz continuous wave imaging is based on a CO2-laser-pumped terahertz coherent source and an uncooled bolometer array of terahertz camera. The active terahertz polarization imaging and wave front imaging is developed. For the passive terahertz imaging, the low frequency of radiometers are used to detect the point-to-point beam-scanned terahertz signal by the optical focusing and scanning system so that the passive THz imaging is realized for the security inspection of human body. The related components and image processing methods are studied and used for the improvement of imaging speed and resolution. The research on THz imaging technology at Capital Normal University is opening up a potential application in the field of non-destructive testing and security inspection for the terahertz technology.
Copyright © 2017 Authors retain the copyright of this article.This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
