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Research on Column FPN and Black Level Calibration in Large Array CMOS image Sensor

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Chinese Journal of Electronics 2021年第2期30卷 268-274页

作者： GUO Zhongjie YU Ningmei WU Longsheng School of Automation and Information Engineering Xi'an University of Technology Xi'an Microelectronic Technology Institute

A technical investigation, research and implementation is presented to correct column fixed pattern noise and black level in large array Complementary metal oxide semiconductor(CMOS) image sensor. Through making a comparison among reported solution, and give large array CMOS image sensor design and considerations,according to our previous analysis on non-ideal factor and error source of piecewise Digital to analog converter(DAC) in multi-channels, an improving accurate piecewise DAC with adaptive switch technique is developed. The research theory has verified by a high dynamic range and low column Fixed pattern noise(FPN) CMOS image sensor prototype chip, which consisting of 8320×8320 pixel array was designed and fabricated in 55 nm CMOS 1P4M standard process. The chip active area is 48 mm×48 mm with a pixel size of 5.7μm×5.7μm. The measured results achieved a high intrinsic dynamic range of 75 d B, a low FPN and black level of 0.06%, a low photo response non-uniformity of 1.5% respectively, and an excellent raw sample image taken by the prototype sensor.

关键词： image detectors, convertors, and intensifiers CMOS integrated circuits image sensors CMOS image sensor Column FPN Readout chain DAC

Modified maximum likelihood registration based on information fusion

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Chinese Optics Letters 2007年第11期5卷 639-641页

作者：祁永庆敬忠良胡士强 School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200030 School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200030 Institute of Aerospace Science and TechnologyShanghai Jiao Tong UniversityShanghai 200030

The bias estimation of passive sensors is considered based on information fusion in multi-platform multisensor tracking system. The unobservable problem of bearing-only tracking in blind spot is analyzed. A modified maximum likelihood method, which uses the redundant information of multi-sensor system to calculate the target position, is investigated to estimate the biases. Monte Carlo simulation results show that the modified method eliminates the effect of unobservable problem in the blind spot and can estimate the biases more rapidly and accurately than maximum likelihood method. It is statistically efficient since the standard deviation of bias estimation errors meets the theoretical lower bounds.

关键词： Computer simulation image sensors Maximum likelihood Monte Carlo methods

Design of resolution testing facility for ultraviolet imager

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Chinese Optics Letters 2008年第7期6卷 510-512页

作者：王加朋王淑荣林冠宇 Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033 Graduate University of Chinese Academy of SciencesBeijing 100049 Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033

We present a resolution testing system of ultraviolet （UV） imager. In this system, an UV Czerny-Turner monochromator with a small f-number is designed to get more energy as an UV radiation source, and its stray light is rejected effectively by light traps. And UV diffuser is employed in order to get uniform light distribution on the resolving power test target. We also design a novel UV collimator which makes infinite UV testing targets. It can reduce the difficulty of optical design and the machining cost, and utilize UV energy at maximum extent. This facility has been applied in the imaging quality evaluation of the UV instrument, and the results accord with the theoretical analysis.

关键词： Computer networks Electric network analysis image sensors Optical design Quantum optics Ultraviolet radiation

Advantages of QWIP technology in infrared thermal cameras

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应用光学 2017年第2期38卷 298-303页

作者： Eric Belhaire Regis Pichon Thales Optronique SAS 2 avenue Gay-Lussac Elaneourt 78995 France

Standard GaAs/AlGaAs quantum well infrared photodetectors(QWIP)have been seriously considered as atechnological choice for the 3^(rd) generation of thermal imagers in the long wave infrared band(LWIR)for some *** technology like MCT(HgCdTe)was the technology choice of the 2^(nd) generation because of its high quantum *** the paper,measurements on the QWIP technology will be presented and a comparison with alternative technology will be done.

关键词： infrared detectors image sensors quantum well infrared photodetectors(QWIP)

Neuromorphic vision sensors: Principle, progress and perspectives

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Journal of Semiconductors 2021年第1期42卷 112-121页

作者： Fuyou Liao Feichi Zhou Yang Chai The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518057China Department of Applied Physics The Hong Kong Polytechnic UniversityHong KongChina

Conventional frame-based image sensors suffer greatly from high energy consumption and *** neurobiological structures and functionalities of the retina provides a promising way to build a neuromorphic vision sensor with highly efficient image *** this review article,we will start with a brief introduction to explain the working mechanism and the challenges of conventional frame-based image sensors,and introduce the structure and functions of biological *** the main section,we will overview recent developments in neuromorphic vision sensors,including the silicon retina based on conventional Si CMOS digital technologies,and the neuromorphic vision sensors with the implementation of emerging ***,we will provide a brief outline of the prospects and outlook for the development of this field.

关键词： image sensors silicon retina neuromorphic vision sensors photonic synapses

Shot Noise Adaptive Bilateral Filter

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Shot Noise Adaptive Bilateral Filter

ENHANCING ANGULAR RESOLUTION IN NON-COHERENT RADAR imageRY

2008 9th International Conference on Signal Processing(ICSP’2008)

作者： Harold Phelippeau Hugues Talbot Mohamed Akil Stefan Bara Universit Paris-Est LabinfoESIEE 93162 Noisy-le-Grand Cedex France NXP Semiconductors 2 Esplanade Anton Philips Campus EffiscienceColombelles BP 2000 14906Caen Cedex 9France

The bilateral filter（BF） [1,2,3] is an important image denoising local *** reduces noise in images while preserving edges by means of nonlinear combination of local pixel *** formulation and implementation are both ***,the BF is not *** set of the bilateral filter parameters has an important influence on its behavior and *** have to be chosen considering the end *** the case of noise removal,the parameters have to be adapted to the noise level,while the bilateral filter adapts itself to the image details *** this paper we propose a method to estimate the best bilateral filter intensity parameter set in the case of shot noise removal,the dominant form of natural noise in digital imaging.

关键词： image sensors Poisson noise model noise filtering noise reduction noise estimation photons flow gaussian weight

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ENHANCING ANGULAR RESOLUTION IN NON-COHERENT RADAR IMAGERY

A Framework for Introducing Precision Agriculture Technologies in Egypt

1996 CIE International Conference of Radar(ICR’96)

作者： Firooz Sadjadi 3400 Highcrest Road Minneapolis MN 55418

＜正＞imagery that are obtained by non-coherent radar sensors suffer from a multitude of quality degradations among which antenna induced poor angular resolution is one of the most troublesome. We present a new approach to beam sharpening that improves the apparent resolution of the radar sensor several times depending on the signal-to-noise *** technique consists of a compensating filter whose coefficients are obtained by minimizing the expected quadratic estimation *** nonlinear filter is then applied on sets of real 35 GHZ non-coherent radar imagery and its performance is *** of the implementation of the technique on real-time digital signal processing（DSP）hardware are also provided.

关键词： image resolution Radar imaging Radar antennas Signal resolution Digital signal processing image sensors Degradation Signal to noise ratio Filters Estimation error

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Management Studies 2023年第3期11卷 175-183页

作者： Mahmoud Abdelnabby Tarek Khalil Nile University Egypt

Precision Agriculture(PA)has been used in many countries and serving the agricultural *** use of PA solutions intervened with many agricultural businesses and supported decision making using data *** Agriculture depends on weather,soil,plants,and water information that are essential for *** Agriculture depends on the use of several technologies such as image sensors,vision machines,drones,robots,machine learning,and artificial *** use of Precision Agriculture Technologies(PAT)depends on integration between devices,sensors,and systems to ensure the proper implementation of *** paper is generated from research on the applicability of PA in in Egypt that ended with a proposed framework for proper implementation of *** conducted research depended on a survey,focus group discussions,and an online questionnaire that reached 271 respondents from 19 Egyptian *** framework has been developed to enhance the role of an initiative leader to promote PAT through collaboration with other stakeholders in the agricultural *** proposed framework can be used by governmental,non-governmental entities,universities and private sector institutions and could be used at countries facing issues with land fragmentation,limited access to information,limited access to agricultural extension services,and increase in agricultural input’s prices.

关键词： Precision Agriculture precision agriculture technologies image sensors robots machine learning Internet of Things