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Smart CMOS mid-infrared sensor array

OPTICS LETTERS 2019年第17期44卷 4111-4114页

作者： Popa, Daniel Ali, Sped Zeeshan Hoppe, Richard Dai, Ying Udrea, Florin Univ Cambridge Dept Engn Cambridge CB30FA England Ams Sensors UK Ltd Cambridge CB4 0DL England

We present a novel single-chip thermopile sensor array for mid-infrared room temperature imaging. The array is fabricated on a single complementary metal-oxide-semiconductor (CMOS) dielectric membrane, composed of single-crystal silicon (Si) p(+) and n(+) elements, and standard CMOS tungsten metal layers for thermopile cold junction heatsinking, significantly reducing the chip size and simplifying its processing. We demonstrate a 16 x 16 pixel device with 34 V/W responsivity and enhanced optical absorption in the 8-14 mu m waveband, with a suitable performance for gesture recognition and people-counting applications. Our simple, low-cost sensor is an attractive on-chip array for a variety of applications in the mid-infrared spectral region. (C) 2019 Optical Society of America

关键词： Fourier transform infrared spectroscopy image processing image processing algorithms image sensors Infrared sensors Optical systems

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Improved texture reproduction assessment of camera-phone-based medical devices with a dead leaves target

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OSA CONTINUUM 2019年第6期2卷 1863-1879页

作者： Suresh, Nitin Pfefer, T. Joshua Su, Jiahao Chen, Yu Wang, Quanzeng US FDA Ctr Devices & Radiol Hlth 10903 New Hampshire Ave Silver Spring MD 20993 USA Univ Maryland Dept Elect & Comp Engn 2410 AV Williams Bldg College Pk MD 20742 USA Univ Maryland Fischell Dept Bioengn 4108 Clark Hall College Pk MD 20742 USA

Camera-phone-based medical devices (CPMDs) represent a major emerging platform for point-of-care diagnostic imaging of biological tissue. In order to evaluate degradation in texture reproduction due to visible light image processing performed by CPMDs, a method (MTFDL) involving the generation of a modulation transfer function (MTF) based on measurements of a 'dead leaves (DL)' target has been proposed. In this study, we have identified discrepancies in the quantification of noise based on gray patches of the DL target as compared to the textual region. To address this issue, we have proposed an approach (MTFDL-den) for accurate MTFDL calculation through the use of effectively denoised DL images. Furthermore, we demonstrate that our MTFDL-den approach provides superior robustness to simulated noise. These findings will help establish effective standardized test methods for realistic benchtop assessment of CPMD image quality. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

关键词： Digital image processing image processing image processing algorithms image quality Medical image processing Visible light

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Wavemeter based on dispersion and speckle in a tapered hollow waveguide

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OSA CONTINUUM 2019年第2期2卷 495-506页

作者： Hornig, G. J. Harrison, T. R. Bu, L. Azmayesh-Fard, S. Decorby, R. G. Univ Alberta ECE Dept 9211-116 St Edmonton AB T6G 1H9 Canada

We demonstrate a broadband wavemeter by imaging the radiation from multiple interfering modes approaching cutoff in a tapered hollow waveguide (clad by omnidirectional Bragg mirrors). Dispersion of the cutoff point was used to extract a coarse wavelength estimate, and subsequent computational analysis of the complex standing wave radiation pattern leading up to the cutoff point enabled a much finer estimate. This approach leverages the principles of speckle-based spectrometers but with added functionality provided by the spectral-spatial dispersion of the mode cutoff position. In proof-of-principle work, we verified a resolution < 10 pm over an operating range of nearly 100 nm in the near infrared using a tapered waveguide with a length < 1 mm. Significantly enhanced resolution should be possible through feasible refinements of the waveguides and peripheral components. (c) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

关键词： Hollow waveguides image processing algorithms image sensors Near infrared radiation Optical devices Speckle patterns

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Vision and Geolocation Data Combination for Precise Human Detection and Tracking in Search and Rescue Operations

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International Journal of Intelligence Science 2020年第3期10卷 41-64页

作者： Lygouras Eleftherios Department of Production and Management Engineering Democritus University of Thrace Xanthi Greece

In this paper, a study and evaluation of the combination of GPS/GNSS techniques and advanced image processing algorithms for distressed human detection, positioning and tracking, from a fully autonomous Unmanned Aerial Vehicle (UAV)-based rescue support system, are presented. In particular, the issue of human detection both on terrestrial and marine environment under several illumination and background conditions, as the human silhouette in water differs significantly from a terrestrial one, is addressed. A robust approach, including an adaptive distressed human detection algorithm running every N input image frames combined with a much faster tracking algorithm, is proposed. Real time or near-real-time distressed human detection rates achieved, using a single, low cost day/night NIR camera mounted onboard a fully autonomous UAV for Search and Rescue (SAR) operations. Moreover, the generation of our own dataset, for the image processing algorithms training is also presented. Details about both hardware and software configuration as well as the assessment of the proposed approach performance are fully discussed. Last, a comparison of the proposed approach to other human detection methods used in the literature is presented.

关键词： Distressed Human Detection Unmanned Aerial Vehicles (Uavs) Search and Rescue (SAR) Operations Aerial image processing image processing algorithms

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A Comparative Analysis of Implementation Performances for image processing Applications Used to Control Robotic Arms

A Comparative Analysis of Implementation Performances for Im...

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IEEE International Conference on Environment and Electrical Engineering (EEEIC) / IEEE Industrial and Commercial Power Systems Europe (ICPS Europe)

作者： Ricman, Radu-Stefan Szabo, Roland Gontean, Aurel Politehn Univ Timisoara Appl Elect Dept ETcTI Timisoara Romania

ISBN: (纸本)9781538651865

This paper presents an analysis of code implementation performance for image processing algorithms. The test is made for image processing algorithms for robotic arms, but it is suitable for any type of image processing software. image processing software can use quite big amount of resources, so this way it can be tested which platform, which operating system or which programming language is the most suitable for usage. The image processing task is a color detection task with some line and circle overlays for robotic arm's guidance. The implementations were tested base on code line numbers, code size on disk, binary file size on disk, used memory during execution and used CPU during execution.

关键词： code execution code size image processing algorithms performance comparison resource utilization robotic arm control software implementation

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Editorial for the Special Issue "Estimation of Crop Phenotyping Traits using Unmanned Ground Vehicle and Unmanned Aerial Vehicle imagery"

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REMOTE SENSING 2020年第6期12卷 940-940页

作者： Jin, Xiuliang Li, Zhenhai Atzberger, Clement Chinese Acad Agr Sci Inst Crop Sci Key Lab Crop Physiol & Ecol Minist Agr Beijing 100081 Peoples R China NERCITA Beijing 100097 Peoples R China Univ Nat Resources & Life Sci BOKU Inst Geomat Peter Jordan Str 82 A-1190 Vienna Austria

High-throughput crop phenotyping is harnessing the potential of genomic resources for the genetic improvement of crop production under changing climate conditions. As global food security is not yet assured, crop phenotyping has received increased attention during the past decade. This spectral issue (SI) collects 30 papers reporting research on estimation of crop phenotyping traits using unmanned ground vehicle (UGV) and unmanned aerial vehicle (UAV) imagery. Such platforms were previously not widely available. The special issue includes papers presenting recent advances in the field, with 22 UAV-based papers and 12 UGV-based articles. The special issue covers 16 RGB sensor papers, 11 papers on multi-spectral imagery, and further 4 papers on hyperspectral and 3D data acquisition systems. A total of 13 plants' phenotyping traits, including morphological, structural, and biochemical traits are covered. Twenty different data processing and machine learning methods are presented. In this way, the special issue provides a good overview regarding potential applications of the platforms and sensors, to timely provide crop phenotyping traits in a cost-efficient and objective manner. With the fast development of sensors technology and image processing algorithms, we expect that the estimation of crop phenotyping traits supporting crop breeding scientists will gain even more attention in the future.

关键词： crop phenotyping traits unmanned ground vehicle unmanned aerial vehicle image processing algorithms segmentation classification machine learning different sensors data data assimilation

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Obtaining images by Measuring Time

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Optics and Photonics News 2020年第12期31卷 50-50页

作者： Turpin, Alex Musarra, Gabriella Kapitany, Valentin Tonolini, Francesco Lyons, Ashley Starshynov, Ilya Murray-Smith, Roderick Faccio, Daniele Villa, Federica Conca, Enrico Fioranelli, Francesco University of Glasgow Glasgow United Kingdom Politecnico di Milano Milan Italy Technische Universiteit Delft Delft Netherlands

Obtaining an image of a scene is obvious and intuitive. The light refl ected from every object of the scene is collected with lenses and projected (imaged) onto an array of pixels (a sensor) that records the light int... 详细信息

关键词： image processing algorithms Light intensity Pulsed operation Sensors Single photon avalanche diodes Three dimensional imaging

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Circumventing LoS Blocking in Beam-Steered Optical-Wireless Systems with Real-Time Tracking and Handover

Circumventing LoS Blocking in Beam-Steered Optical-Wireless ...

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Optical Fiber Communication (OFC) Conference

作者： Ketema Mekonnen Quan Pham Frans Huijskens Eduward Tangdiongga Ali Mefleh Ton Koonen Institute for Photonic Integration Eindhoven University of Technology Eindhoven The Netherlands KPN CTO Technology Roadmap & Architecture The Hague The Netherlands

This paper demonstrates a real-time user tracking and handover mechanism for indoor ultrahigh-speed beam-steered optical-wireless systems implementing a low-cost camera. This allows us to tackle LoS blocking by switch... 详细信息

ISBN: (数字)9781943580712

ISBN: (纸本)9781728167626

关键词： Beam steering image processing image processing algorithms Laser materials processing Tunable diode lasers Tunable lasers

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Multi-User Localization and Upstream Signaling for Indoor OWC System using a Camera Technology

Multi-User Localization and Upstream Signaling for Indoor OW...

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Optical Fiber Communication (OFC) Conference

作者： N. Q. Pham K. A. Mekonnen E. Tangdiongga A. Mefleh A. M. J. Koonen Eindhoven University of Technology Eindhoven Netherlands Institute for Photonic Integration Eindhoven University of Technology Eindhoven The Netherlands KPN CTO Technology Roadmap & Architecture The Hague The Netherlands

We present upstream signaling and localization for an indoor beam-steered OWC system using vision-based technology. We demonstrate a 1.2kbps upstream signaling and localization system which enables to identify a large... 详细信息

ISBN: (数字)9781943580712

ISBN: (纸本)9781728167626

关键词： image processing algorithms Light beams Light intensity Optical signals Optical wireless communication Tunable lasers

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Automated image processing algorithm for infrared meibography

Automated image processing algorithm for infrared meibograph...

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Imaging Systems and Applications, ISA 2018

作者： Llorens-Quintana, Clara Syga, Piotr Robert Iskander, D. Department of Biomedical Engineering Wroclaw University of Science and Technology Wroclaw Poland Department of Computer Science Wroclaw University of Science and Technology Wroclaw Poland

Infrared meibography is a technique for imaging meibomian glands that are located in the rim of the eyelids. An automated methodology for analysing these images was proposed to assess meibomian glands structure and he... 详细信息

ISBN: (纸本)9781943580446

关键词： algorithms image processing algorithms In vivo imaging Infrared imaging Nonlinear spatial filtering Proteins

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