Multispectral concealed weapon detection in visible, infrared, and terahertz

Kowalski, Marcin; Kastek, M.; Polakowski, H.; Pałka, Norbert; Piszczek, Marek; Szustakowski, Mieczysław

doi:10.1117/12.2049692

Cited by 9 publications

(10 citation statements)

References 3 publications

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“…The company ThruVision introduced a system for imaging at 250 GHz with a bandwidth of 40 GHz [393][394][395] (using an 8-element receiver array; image frame rate: 3 frames/s [396]). Such a system was used in comparative passive security imaging tests in the VIS, IR and THz frequency regimes [394,397]. A heterodyne system operating at 640 GHz with a 20-GHz bandwidth was reported in Ref.…”

Section: Passive Thz Imagingmentioning

confidence: 99%

Roadmap of Terahertz Imaging 2021

Valušis

Lisauskas

Yuan

et al. 2021

Sensors

191

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In this roadmap article, we have focused on the most recent advances in terahertz (THz) imaging with particular attention paid to the optimization and miniaturization of the THz imaging systems. Such systems entail enhanced functionality, reduced power consumption, and increased convenience, thus being geared toward the implementation of THz imaging systems in real operational conditions. The article will touch upon the advanced solid-state-based THz imaging systems, including room temperature THz sensors and arrays, as well as their on-chip integration with diffractive THz optical components. We will cover the current-state of compact room temperature THz emission sources, both optolectronic and electrically driven; particular emphasis is attributed to the beam-forming role in THz imaging, THz holography and spatial filtering, THz nano-imaging, and computational imaging. A number of advanced THz techniques, such as light-field THz imaging, homodyne spectroscopy, and phase sensitive spectrometry, THz modulated continuous wave imaging, room temperature THz frequency combs, and passive THz imaging, as well as the use of artificial intelligence in THz data processing and optics development, will be reviewed. This roadmap presents a structured snapshot of current advances in THz imaging as of 2021 and provides an opinion on contemporary scientific and technological challenges in this field, as well as extrapolations of possible further evolution in THz imaging.

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Section: Passive Thz Imagingmentioning

confidence: 99%

Roadmap of Terahertz Imaging 2021

Valušis

Lisauskas

Yuan

et al. 2021

Sensors

191

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“…where  is the provided angular size of an object, Bs is scenery brightness,  is the brightness contrast of an object against the background, 2 is the provided angular diameter of the field where an object is found, t is location time, and a is the proportionality factor characterizing the location capacity of an observer [12][13][14][15][16].…”

Section: Methodsmentioning

confidence: 99%

Choice of Spectral Range for Devices for Remote Sensing of Power Lines

Shpenst¹

2019

Proceedings of the VIII Science and Technology Conference “Contemporary Issues of Geology, Geophysics and Geo-Ecology of the No

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This article describes the basic methodological aspects of designing multispectral optoelectronic devices for the remote inspection of overhead power lines. A method for selecting operating spectral areas for these devices was suggested on the basis of the proposed detection criteria. The proposed method considers physical phenomena that occur during the visual inspection and detection of objects. It allows the rational selection of operating areas of a multispectral device, including the number, width, and location of these areas in the optical spectrum. The author determines that effect of the spectral area width on object detection probability can be estimated by the correlation between spectral and integral contrasts.The optimal operating areas for multispectral devices with direct image visualization are selected according to the developed method. The solution of the optimization problems suggests that the detection of the standard overhead power lines requires images to be formed in the following spectral areas: when power lines are located against the background of the green vegetation -725…775 nm, 825…875 nm, 475…575 nm, 375…425 nm; and against a softwood forest -625…675 nm, 375…425 nm, 875…925 nm. In addition, the study describes methods for estimating their efficiency and provided the simulation results of the operation process.

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“…Considering the fact that even THz images with low pixel resolution still provide valuable information, it is justified to combine them with the high-resolution images from a visible camera [11,12]. Image fusion is a process of combining two or more images, or it can be defined as the process by which several images or parts of images (features) are combined into a single image.…”

Section: Methodology Of Imagingmentioning

confidence: 99%

“…Because of the relatively small pixel and spatial resolutions of modern terahertz cameras, it was not possible to recognize the object for detection based on the terahertz image [11]. The investigation into new non-destructive methods for the recognition of detected objects led to the concept of the methodology of multispectral detection [11,12]. The methodology is presented in Fig.…”

Section: Methodology Of Imagingmentioning

confidence: 99%

Harmless screening of humans for the detection of concealed objects

Kowalski

Kastek

Piszczek

et al. 2015

WIT Transactions on the Built Environment

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Multispectral screening systems are becoming more popular because of a wide range of applications. Terahertz and infrared radiation have unique properties applicable to the field of surveillance and security systems. One of the most significant applications of multispectral screening systems is the prevention of terrorist attacks. Visual detection of objects hidden under clothing of a person is one of the most challenging problems of threat detection. There are many solutions to the problem; however, the most effective utilize multispectral surveillance imagers. We investigate the possibility of harmlessly detecting objects covered by various types of clothing in three spectrums-visible, infrared and terahertz. The terahertz range of electromagnetic radiation has considerable potential to detect hidden objects because it penetrates clothes. The infrared imagers are also very useful in searching for concealed objects because infrared cameras can detect small temperature differences on the surface of clothing. Radiation from these three ranges is harmless to humans. We present the detection methodology using infrared and terahertz imagers as complementary sensors to provide image data for a multispectral threat detection system. Possible ways of using the results are also presented.

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Multispectral concealed weapon detection in visible, infrared, and terahertz

Cited by 9 publications

References 3 publications

Roadmap of Terahertz Imaging 2021

Roadmap of Terahertz Imaging 2021

Choice of Spectral Range for Devices for Remote Sensing of Power Lines

Harmless screening of humans for the detection of concealed objects

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