Study of accessible performances of a spectro imager using a wedge filter

Loesel, Jacques; Laubier, D.

doi:10.1117/12.796966

Cited by 5 publications

(5 citation statements)

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“…We have previously enabled fast, compact and cost-effective spectral cameras by monolithically integrating optical interference filters on top of standard CMOS image sensors for high resolution pushbroom hyperspectral cameras [19] and for non-scanning snapshot multispectral cameras with optical duplication [20] and per-pixel filter mosaics [21]. Through the monolithic integration of the filter on the sensor, the stray light in the system is heavily reduced 5.5kg and the sensitivity and the speed of the sensor are increased [22]. The use of CMOS process technology heavily reduces the cost and improves the compactness of the hyperspectral camera, and is further described in Section 3.…”

Section: State Of the Artmentioning

confidence: 98%

A tiny VIS-NIR snapshot multispectral camera

et al. 2015

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Spectral imaging can reveal a lot of hidden details about the world around us, but is currently confined to laboratory environments due to the need for complex, costly and bulky cameras. Imec has developed a unique spectral sensor concept in which the spectral unit is monolithically integrated on top of a standard CMOS image sensor at wafer level, hence enabling the design of compact, low cost and high acquisition speed spectral cameras with a high design flexibility. This flexibility has previously been demonstrated by imec in the form of three spectral camera architectures: firstly a high spatial and spectral resolution scanning camera, secondly a multichannel snapshot multispectral camera and thirdly a per-pixel mosaic snapshot spectral camera. These snapshot spectral cameras sense an entire multispectral data cube at one discrete point in time, extending the domain of spectral imaging towards dynamic, video-rate applications. This paper describes the integration of our per-pixel mosaic snapshot spectral sensors inside a tiny, portable and extremely user-friendly camera. Our prototype demonstrator cameras can acquire multispectral image cubes, either of 272x512 pixels over 16 bands in the VIS (470-620nm) or of 217x409 pixels over 25 bands in the VNIR (600-900nm) at 170 cubes per second for normal machine vision illumination levels. The cameras themselves are extremely compact based on Ximea xiQ cameras, measuring only 26x26x30mm, and can be operated from a laptop-based USB3 connection, making them easily deployable in very diverse environments.

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Section: State Of the Artmentioning

confidence: 98%

A tiny VIS-NIR snapshot multispectral camera

et al. 2015

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“…17 The effective filter transmission and spectral profile also depend on the distance between the FPA and the filter, filter bandwidth, and f-number of the lens. This efficiency variation has, therefore, been studied more closely and is modeled below.…”

Section: Hyperspectral Camera Designmentioning

confidence: 99%

“…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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“…We have prev CMOS image the filter on th increased [4] hyperspectral problems wit operator com This paper in top of a stand snapshot acq acquisition re Whereas in s snapshot spec on the senso spectral imag categories an multispectral important inc domains.…”

Section: Introductionmentioning

confidence: 99%

A snapshot multispectral imager with integrated tiled filters and optical duplication

2013

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Although the potential of spectral imaging has been demonstrated in research environments, its adoption by industry has so far been limited due to the lack of high speed, low cost and compact spectral cameras. We have previously presented work to overcome this limitation by monolithically integrating optical interference filters on top of standard CMOS image sensors for high resolution pushbroom hyperspectral cameras. These cameras require a scanning of the scene and therefore introduce operator complexity due to the need for synchronization and alignment of the scanning to the camera. This typically leads to problems with motion blur, reduced SNR in high speed applications and detection latency and overall restricts the types of applications that can use this system. This paper introduces a novel snapshot multispectral imager concept based on optical filters monolithically integrated on top of a standard CMOS image sensor. By using monolithic integration for the dedicated, high quality spectral filters at its core, it enables the use of mass-produced fore-optics, reducing the total system cost. It overcomes the problems mentioned for scanning applications by snapshot acquisition, where an entire multispectral data cube is sensed at one discrete point in time. This is achieved by applying a novel, tiled filter layout and an optical sub-system which simultaneously duplicates the scene onto each filter tile. Through the use of monolithically integrated optical filters it retains the qualities of compactness, low cost and high acquisition speed, differentiating it from other snapshot spectral cameras based on heterogeneously integrated custom optics. Moreover, thanks to a simple cube assembly process, it enables real-time, low-latency operation. Our prototype camera can acquire multispectral image cubes of 256x256 pixels over 32 bands in the spectral range of 600-1000nm at a speed of about 30 cubes per second at daylight conditions up to 340 cubes per second at higher illumination levels as typically used in machine vision applications.

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Study of accessible performances of a spectro imager using a wedge filter

Cited by 5 publications

References 0 publications

A tiny VIS-NIR snapshot multispectral camera

A tiny VIS-NIR snapshot multispectral camera

High spatial resolution hyperspectral camera based on a linear variable filter

A snapshot multispectral imager with integrated tiled filters and optical duplication

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