Miniature and cooled hyperspectral camera for outdoor surveillance applications in the mid-infrared

Fossi, Armande Pola; Ferrec, Yann; Roux, Nicolas Le; D’Almeida, Oscar; Guérineau, Nicolas; Sauer, Hervé

doi:10.1364/ol.41.001901

Cited by 26 publications

(14 citation statements)

References 12 publications

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“…Step 1 factorizes the spectral response function of a RGB camera with a low-resolution HSI to reconstruct a low-resolution RGB image. An RGB image is reconstructed the equation formulated in [29]: (5) where S ch (λ) (ch = R, G, B) is the spectral response function of an camera for each channel of RGB, L(λ) is spectral power distribution of an illuminant and R x (λ) is a spectral reflectance of a point in an image. Equation (5) can also be written in a matrix form, for a discrete summation along the spectral range of a hyperspectral camera with a given bandwidth.…”

Section: Overall Algorithm and Implementationmentioning

confidence: 99%

“…Most HSI applications in scientific and engineering fields aim to identify materials in an image on the basis of the spectral characteristic of each chemical reflecting the light. HSIs have been used as a powerful tool for detecting certain materials in an object, or measuring quantitative chemical content in the fields of agriculture [1,2], environment [3,4], surveillance [5,6], biomedical imaging [7,8], and geosciences [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Hyperspectral Super-Resolution Technique Using Histogram Matching and Endmember Optimization

Kim

Cho

2019

Applied Sciences

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In most hyperspectral super-resolution (HSR) methods, which are techniques used to improve the resolution of hyperspectral images (HSIs), the HSI and the target RGB image are assumed to have identical fields of view. However, because implementing these identical fields of view is difficult in practical applications, in this paper, we propose a HSR method that is applicable when an HSI and a target RGB image have different spatial information. The proposed HSR method first creates a low-resolution RGB image from a given HSI. Next, a histogram matching is performed on a high-resolution RGB image and a low-resolution RGB image obtained from an HSI. Finally, the proposed method optimizes endmember abundance of the high-resolution HSI towards the histogram-matched high-resolution RGB image. The entire procedure is evaluated using an open HSI dataset, the Harvard dataset, by adding spatial mismatch to the dataset. The spatial mismatch is implemented by shear transformation and cutting off the upper and left sides of the target RGB image. The proposed method achieved a lower error rate across the entire dataset, confirming its capability for super-resolution using images that have different fields of view.

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Section: Overall Algorithm and Implementationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hyperspectral Super-Resolution Technique Using Histogram Matching and Endmember Optimization

Kim

Cho

2019

Applied Sciences

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“…Efficient large étendue imaging instruments usually rely on a shearing interferometer, most often a cyclic interferometer [1][2][3][4] or a roof-prism mirrors Michelson interferometer [5,6,8]. For more compact setups, birefringent shearing interferometers like Savart plates [9][10][11] a Armande Pola Fossi is now with Thales LAS France SAS, 2 avenue Gay- or Double-Wollaston prism devices [12,13] are often used, either for imaging spectrometry or for non-imaging spectrometry. Other designs with birefringent interferometers, aside from lateral shearing interferometers, have also been developed for Fourier transform spectrometry [14][15][16][17][18][19][20] or polarimetry [21,22].…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of nominal and stray waves in birefringent interferometers: application to large-field-of-view imaging Fourier transform spectrometers

et al. 2018

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Birefringent interferometers are often used for compact static Fourier transform spectrometers. In such devices, several uniaxial birefringent parallel or prismatic plates are stacked, with their optical axes set so that there is an efficient coupling from ordinary to extraordinary and extraordinary to ordinary eigenmodes of two successive plates. Such coupling, aside from few particular cases, is however not perfect, an effect that may adversely affect performance. In order to help the design and the tolerancing of these interferometers, we have developed a numerical modeling, based on the propagation of plane waves inside and through the interface of birefringent media. This tool evaluates the traveled optical path length and the amplitude of the different polarization modes, enabling to predict both the optical path differences on the interferometer outputs and the unwanted coupling strengths and related stray wave amplitudes. The tool behavior is illustrated on Savart and Double-Wollaston interferometers, and compared with experimental characterization of a calcite Double-Wollaston prism. OCIS codes: (260.1440) Birefringence; (120.6200) Spectrometers and spectroscopic instrumentation; (110.4234) Multispectral and hyperspectral imaging; (120.0280) Remote sensing and sensors; (120.4570) Optical design of instruments; (300.6300) Spectroscopy, Fourier transforms; (220.4830) Systems design.

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“…New more compact systems are being developed to meet the requirements of low size, weight, power consumption, and cost, which includes both push-broom solutions and snapshot systems. [2][3][4][5][6][7][8][9][10][11] In the design presented here, high spatial resolution is achieved by mounting a linear variable filter (LVF) on top of a large focal plane array (FPA) with 5760 × 3840 pixels (22.3 MP). The LVF covers a range of 450to 880 nm in the visible-and near-infrared spectral region.…”

Section: Introductionmentioning

confidence: 99%

High spatial resolution hyperspectral camera based on a linear variable filter

Renhorn¹,

Bergström

Hedborg

et al. 2016

Opt. Eng

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Abstract. A small, lightweight, and inexpensive hyperspectral camera based on a linear variable filter close to the focal plane array (FPA) is described. The use of a full-frame sensor allows large coverage with high spatial resolution at moderate spectral resolution. The spatial resolution has been maintained using a tilt/shift lens for chromatic focusing corrections. The trade-offs of positioning the filter relative to the FPA and varying the f -number have been studied. Calibration can correct for artifacts such as spectral filter variability. Reference spectra can be obtained using the same camera system by imaging targets over homogeneous areas. For textured surfaces, the different materials can be separated by using statistical methods. Accurate reconstruction of the sparse spectral image data is demonstrated.

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Miniature and cooled hyperspectral camera for outdoor surveillance applications in the mid-infrared

Cited by 26 publications

References 12 publications

Hyperspectral Super-Resolution Technique Using Histogram Matching and Endmember Optimization

Hyperspectral Super-Resolution Technique Using Histogram Matching and Endmember Optimization

Numerical modeling of nominal and stray waves in birefringent interferometers: application to large-field-of-view imaging Fourier transform spectrometers

High spatial resolution hyperspectral camera based on a linear variable filter

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