Near-infrared active polarimetric and multispectral laboratory demonstrator for target detection

Alouini, Mehdi; Goudail, François; Grisard, Arnaud; Bourderionnet, Jérôme; Dolfi, Daniel; Bénière, Arnaud; Baarstad, Ivar; Løke, Trond; Kaspersen, Peter; Normandin, Xavier; Berginc, Gérard

doi:10.1364/ao.48.001610

Cited by 52 publications

(23 citation statements)

References 27 publications

(32 reference statements)

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“…In this section we will show how this system enables a good OSC estimation in real conditions. In particular, we will carry out experiments in situations where systems based on sequential acquisition [3,14,27] show weakness and imprecision. The system designed in this paper can also be operated in a sequential acquisition mode to show the benefit of simultaneous acquisition: one just has to consider the parallel image X in an acquisition and the orthogonal image Y in the subsequent acquisition.…”

Section: Validation Of Concept On Some Real Situationsmentioning

confidence: 99%

Design and experimental validation of a snapshot polarization contrast imager

et al. 2009

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We present a degree of polarization imaging system based on a Wollaston prism and a single CCD camera. This architecture eliminates technical inaccuracies and noise sources that are present in experimental setups containing a polarization switching element. After the acquisition of two images corresponding to two orthogonal states of polarization, one can compute the orthogonal state contrast image (OSCI), which is an estimate of the local degree of polarization of the backscattered light when the observed materials are purely depolarizing. The instrument design coupled to an efficient calibration enables the estimation of the OSCI from a single image acquisition and significant reduction of technical noise present in other polarization imaging systems. The setup was tested in realistic conditions where it represents a real asset.

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Section: Validation Of Concept On Some Real Situationsmentioning

confidence: 99%

Design and experimental validation of a snapshot polarization contrast imager

et al. 2009

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“…The polarizers are oriented at 0° (), 45° (), 90° () from the horizontal state of polarization of the source. First, we identify the polarimetric behavior of the scene with an Orthogonal States Contrast (OSC) imaging approach which is well adapted to target detection application 1,4,5,13 but requires two acquisitions. For this reason, we have slightly modified the illumination stage of the demonstrator to perform a full field OSC imaging technique.…”

Section: Imaging Results On Artifical Scenariosmentioning

confidence: 99%

“…At the same time, it reduces drastically the ocular hazard when operating with powerful illumination source, as the first layers of the eye absorb strongly infrared light thus preserving the retina. In the literature, most of the NIR active polarimetric imagers use the OSC technique [1][2][3][4][5] since it is able to discriminate non-depolarizing man-made objects from a depolarizing natural environment with only two acquisitions using crossed polarizers at the analysis.…”

Section: Introductionmentioning

confidence: 99%

Active infrared polarimetric imaging demonstrator by orthogonality breaking sensing

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et al. 2017

Polarization Science and Remote Sensing VIII

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We report the design of a free-space active infrared polarimetric imaging demonstrator operating at 1.55 µm and based on a non-conventional approach: the orthogonality breaking sensing technique. Relying on the illumination of a scene with a specific light source, the imager offers an original tradeoff between image acquisition time (~ 1 s) and polarimetric consistency in comparison to standard polarimetric imagers such as division of time or division of amplitude systems. We will illustrate the capability of such an imager to enhance the visibility of hidden objects on homemade scenes.

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“…Thales and CNRS in France in collaboration with Norsk Elektro Optikk (Norway) report on the design and exploitation of a real-field laboratory demonstrator [4]. It was found that good detection performances rely on the joint use of intensity and polarimetric images, with these images exhibiting complementary signatures in most cases.…”

Section: Laboratory Investigations Of Active Spectral Imaging-hard Tamentioning

confidence: 99%

ACTIM: an EDA initiated study on spectral active imaging

et al. 2010

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This paper will describe ongoing work from an EDA initiated study on Active Imaging with emphasis of using multi or broadband spectral lasers and receivers. Present laser based imaging and mapping systems are mostly based on a fixed frequency lasers. On the other hand great progress has recently occurred in passive multi-and hyperspectral imaging with applications ranging from environmental monitoring and geology to mapping, military surveillance, and reconnaissance. Data bases on spectral signatures allow the possibility to discriminate between different materials in the scene. Present multi-and hyperspectral sensors mainly operate in the visible and short wavelength region (0.4-2.5 μm) and rely on the solar radiation giving shortcoming due to shadows, clouds, illumination angles and lack of night operation. Active spectral imaging however will largely overcome these difficulties by a complete control of the illumination. Active illumination enables spectral night and low-light operation beside a robust way of obtaining polarization and high resolution 2D/3D information.Recent development of broadband lasers and advanced imaging 3D focal plane arrays has led to new opportunities for advanced spectral and polarization imaging with high range resolution. Fusing the knowledge of ladar and passive spectral imaging will result in new capabilities in the field of EO-sensing to be shown in the study. We will present an overview of technology, systems and applications for active spectral imaging and propose future activities in connection with some prioritized applications.

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Near-infrared active polarimetric and multispectral laboratory demonstrator for target detection

Cited by 52 publications

References 27 publications

Design and experimental validation of a snapshot polarization contrast imager

Design and experimental validation of a snapshot polarization contrast imager

Active infrared polarimetric imaging demonstrator by orthogonality breaking sensing

ACTIM: an EDA initiated study on spectral active imaging

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