Multiview Imaging with Real-Time Microwave Camera from Known Positions

Laviada, Jaime; Las-Heras, Fernando; Ghasr, Mohammad Tayeb; Zoughi, R.

doi:10.1109/apusncursinrsm.2018.8608615

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…This work technically extends the preliminary work presented in [21], in which the positioning system was not included but the microwave camera was placed at known positions and the imaging data was then processed offline. Here, we first summarize the hardware components, such as the microwave and the depth cameras, as pertinent to the objectives of this work, including the positioning system based on the latter.…”

Section: Introductionmentioning

confidence: 85%

Real-Time Multiview SAR Imaging Using a Portable Microwave Camera With Arbitrary Movement

Laviada

Ghasr

López-Portugués

et al. 2018

IEEE Trans. Antennas Propagat.

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This paper presents the first demonstrator of a portable, multi-view, high-resolution, three-dimensional (3D) and real-time microwave imaging system. The system is based on a recently-developed real-time 3D microwave camera, which performs quasi-monostatic acquisitions, equipped with an optical depth camera providing target surface profile information. Additionally, the entire system can be arbitrarily moved along the target performing microwave and depth camera synchronized acquisitions from different views with a twofold purpose, namely; a) enabling a coverage area much larger than that possible with a static imaging system, and b) allowing for incorporation of several tilt angles (or views) to enhance capturing specular reflection imaging data to improve the overall image quality. At each scanning position, the imaging data from the microwave camera are processed to build a local 3D microwave image. The information is then merged, using recently-proposed techniques for multi-view synthetic aperture imaging, to compose the global image. The synchronized optical camera depth acquisitions enable tracking the entire imager movements so that the position and attitude are known. Moreover, the data acquired by the depth camera are also use to build a complementary 3D outer surface profile model of the target, producing a combined and realistic image of the internal and external geometries of the target. Finally, the performance of the combined system is evaluated using several examples related to hidden contraband covered by clothing (i.e., people screening).

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Section: Introductionmentioning

confidence: 85%

Real-Time Multiview SAR Imaging Using a Portable Microwave Camera With Arbitrary Movement

Laviada

Ghasr

López-Portugués

et al. 2018

IEEE Trans. Antennas Propagat.

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“…In this regard, a microwave camera of reduced size operating between 20 and 30 GHz, offering a tradeoff between size and resolution, has been presented [10]. Moreover, it has been shown that multiview approaches can be used to increase both the image quality and volume under test [11], [12], [13], [14]. A different microwave camera of reduced size based on chaotic excitation SAR, which has low resolution but can be used in applications where high-fidelity images are not necessary, has been presented in [15].…”

Section: Introductionmentioning

confidence: 99%

Freehand mm-Wave Imaging With a Compact MIMO Radar

Álvarez-Narciandi

Laviada

Las-Heras

2021

IEEE Trans. Antennas Propagat.

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This paper presents a freehand imaging system, which takes full-advantage of a compact multiple-input multipleoutput (MIMO) radar to provide real-time results by means of freehand movements. The system is based on a commercial radar-on-chip, equipped with four receivers and two transmitters, and an optical tracking system (i.e., motion capture system) for retrieving its position and attitude. The reduced size of the radar enables its handheld operation, making possible to create a synthetic aperture by moving the scanner over the area of interest. Due to the new degrees of freedom with respect to previous implementations based on quasi-monostatic topologies, a novel calibration strategy for the system is required in order to mitigate positioning errors. After calibration, simulations and measurements are accomplished revealing that the novel freehand multistatic setup significantly outperforms the monostatic setup in terms of scanning speed and image quality. Multimedia material is provided to illustrate this performance.

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“…A balance between system size and resolution has been recently presented in [15] implementing a portable microwave camera operating from 20 to 30 GHz. Furthermore, this kind of system can take advantage of multiview approaches to increase the imaged area and the image quality [16]- [19].…”

Section: Introductionmentioning

confidence: 99%

Freehand, Agile, and High-Resolution Imaging With Compact mm-Wave Radar

et al. 2019

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The aim of this paper is to present a freehand scanning system with a compact mm-wave radar. In order to achieve high-resolution images, the system exploits the free movements of the radar to create a synthetic aperture. However, in contrast to conventional synthetic aperture radar (SAR), in which canonical acquisition surfaces (e.g., planes or cylinders) are used, the system allows for a given tolerance compatible with real handmade trajectories. Moreover, different techniques are studied to compensate for the impact of irregular sampling to reduce the artifacts in the image. As a result, real-time scanning can be readily performed even by inexperienced users. The scanning system, comprising a commercial motion capture system and an mm-wave module, can be easily deployed and calibrated. Several results involving different objects are shown to illustrate the performance of the system. INDEX TERMS SAR imaging, mm-wave imaging, FMCW radar, real-time imaging, freehand scanner.

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Multiview Imaging with Real-Time Microwave Camera from Known Positions

Cited by 3 publications

References 7 publications

Real-Time Multiview SAR Imaging Using a Portable Microwave Camera With Arbitrary Movement

Real-Time Multiview SAR Imaging Using a Portable Microwave Camera With Arbitrary Movement

Freehand mm-Wave Imaging With a Compact MIMO Radar

Freehand, Agile, and High-Resolution Imaging With Compact mm-Wave Radar

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