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7 April 2017 Processing and fusion of passively acquired, millimeter and terahertz images of the human body
Tian Li, Yanchun Shen, Weiqi Jin, Guozhong Zhao, Yi Cai
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Optical Engineering, Vol. 56, Issue 4, 043102 (April 2017). https://doi.org/10.1117/1.OE.56.4.043102
Abstract
A passive, millimeter wave (MMW) and terahertz (THz) dual-band imaging system composed of 94 and 250 GHz single-element detectors was used to investigate preprocessing and fusion algorithms for dual-band images. Subsequently, an MMW and THz image preprocessing and fusion integrated algorithm (MMW-THz IPFIA) was developed. In the algorithm, a block-matching and three-dimensional filtering denoising algorithm is employed to filter noise, an adaptive histogram equalization algorithm to enhance images, an intensity-based registration algorithm to register images, and a wavelet-based image fusion algorithm to fuse the preprocessed images. The performance of the algorithm was analyzed by calculating the SNR and information entropy of the actual images. This algorithm effectively reduces the image noise and improves the level of detail in the images. Since the algorithm improves the performance of the investigated imaging system, it should support practical technological applications. Because the system responds to blackbody radiation, its improvement is quantified herein using the static performance parameter commonly employed for thermal imaging systems, namely, the minimum detectable temperature difference (MDTD). An experiment was conducted in which the system’s MDTD was measured before and after applying the MMW-THz IPFIA, verifying the improved performance that can be realized through its application.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Tian Li, Yanchun Shen, Weiqi Jin, Guozhong Zhao, and Yi Cai "Processing and fusion of passively acquired, millimeter and terahertz images of the human body," Optical Engineering 56(4), 043102 (7 April 2017). https://doi.org/10.1117/1.OE.56.4.043102
Received: 30 December 2016; Accepted: 15 March 2017; Published: 7 April 2017
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Cited by 3 scholarly publications.
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KEYWORDS
Image fusion
Imaging systems
Terahertz radiation
Extremely high frequency
Detection and tracking algorithms
Signal to noise ratio
Sensors
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