SPIE Defense + Security最新文献_第3页

Building robust neighborhoods for manifold learning-based image classification and anomaly detection 基于流形学习的图像分类和异常检测的鲁棒邻域构建

SPIE Defense + Security Pub Date : 2016-05-25 DOI: 10.1117/12.2227224

T. Doster, C. Olson

引用次数: 8

A parametric study of unsupervised anomaly detection performance in maritime imagery using manifold learning techniques 基于流形学习技术的海事图像无监督异常检测性能参数化研究

SPIE Defense + Security Pub Date : 2016-05-25 DOI: 10.1117/12.2227226

C. Olson, T. Doster

引用次数: 12

Performance prediction of multinomial pattern matching under ideal point response variations 理想点响应变化下多项模式匹配的性能预测

SPIE Defense + Security Pub Date : 2016-05-24 DOI: 10.1117/12.2223226

Matthew S. Horvath, B. Rigling

{"title":"Performance prediction of multinomial pattern matching under ideal point response variations","authors":"Matthew S. Horvath, B. Rigling","doi":"10.1117/12.2223226","DOIUrl":"https://doi.org/10.1117/12.2223226","url":null,"abstract":"Typical ATR performance metrics are based on the results of empirical studies on truthed datasets where it is difficult to fully sample the space of expected variation yielding potentially false generalizations of empirical performance results to a rigorous performance assessment. This is especially difficult when many sources of variation can exist in the data, typically referred to as operating conditions. Here, we propose a general method to analytically predict the classification performance of the MPM algorithm when samples are assumed realizations of two separate MPM template parametrizations differing as a function of a single, conditionally independent operation condition. This performance prediction approach is then used to investigate the role the ideal point response has in the classification performance of synthetic aperture radar targets. The exact trade-off we study is coherently processing an aperture to yield a single higher resolution image versus non-coherently processing the aperture to yield multiple lower resolution looks of a scene. Experiments are conducted using SAR imagery from the Air Force Research Laboratories Civilian Vehicle dataset. An additional performance analysis presents an analytic approach to predict algorithm performance under additive white Gaussian noise for a general Nq allowing the performance loss under IPR variations to be mapped to an equivalent loss in signal-to-noise ratio.","PeriodicalId":222501,"journal":{"name":"SPIE Defense + Security","volume":"9843 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129592411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Head-up, eyes-out in day and at night: Striker HMD, evolution or revolution? 白天和晚上的抬头，眼睛:前锋HMD，进化还是革命?

SPIE Defense + Security Pub Date : 2016-05-24 DOI: 10.1117/12.2229036

A. Cameron, R. Hobson

引用次数: 0

Detecting red blotch disease in grape leaves using hyperspectral imaging 利用高光谱成像技术检测葡萄叶片红斑病

SPIE Defense + Security Pub Date : 2016-05-23 DOI: 10.1117/12.2223814

M. Mehrubeoglu, Keith Orlebeck, Michael Zemlan, Wesley Autran

{"title":"Detecting red blotch disease in grape leaves using hyperspectral imaging","authors":"M. Mehrubeoglu, Keith Orlebeck, Michael Zemlan, Wesley Autran","doi":"10.1117/12.2223814","DOIUrl":"https://doi.org/10.1117/12.2223814","url":null,"abstract":"Red blotch disease is a viral disease that affects grapevines. Symptoms appear as irregular blotches on grape leaves with pink and red veins on the underside of the leaves. Red blotch disease causes a reduction in the accumulation of sugar in grapevines affecting the quality of grapes and resulting in delayed harvest. Detecting and monitoring this disease early is important for grapevine management. This work focuses on the use of hyperspectral imaging for detection and mapping red blotch disease in grape leaves. Grape leaves with known red blotch disease have been imaged with a portable hyperspectral imaging system both on and off the vine to investigate the spectral signature of red blotch disease as well as to identify the diseased areas on the leaves. Modified reflectance calculated at spectral bands corresponding to 566 nm (green) and 628 nm (red), and modified reflectance ratios computed at two sets of bands (566 nm / 628 nm, 680 nm / 738 nm) were selected as effective features to differentiate red blotch from healthy-looking and dry leaf. These two modified reflectance and two ratios of modified reflectance values were then used to train the support vector machine classifier in a supervised learning scheme. Once the SVM classifier was defined, two-class classification was achieved for grape leaf hyperspectral images. Identification of the red blotch disease on grape leaves as well as mapping different stages of the disease using hyperspectral imaging are presented in this paper.","PeriodicalId":222501,"journal":{"name":"SPIE Defense + Security","volume":"235 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120967700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Influences of thicknesses and structures of barrier cap layers on As ion profiles and implant damages in HgCdTe epilayers 阻挡帽层厚度和结构对HgCdTe涂层中As离子分布和植入损伤的影响

SPIE Defense + Security Pub Date : 2016-05-20 DOI: 10.1117/12.2224943

Changzhi Shi, Chun Lin, Yanfeng Wei, Lu Chen, Z. Ye

{"title":"Influences of thicknesses and structures of barrier cap layers on As ion profiles and implant damages in HgCdTe epilayers","authors":"Changzhi Shi, Chun Lin, Yanfeng Wei, Lu Chen, Z. Ye","doi":"10.1117/12.2224943","DOIUrl":"https://doi.org/10.1117/12.2224943","url":null,"abstract":"The barrier cap layer (BCL) is considered to be able to absorb partially implant induced damages during ion implantation, thus its structure and property could impact the result of ion implantation. In this paper, for As ion implantation in HgCdTe, the different BCLs were deposited on the CdZnTe-based (LPE) and GaAs-based (MBE) HgCdTe epilayers, respectively. Then, the influences of thicknesses and structures of these BCLs on dopant profiles and implant damages were investigated. The as-grown BCLs include thermally evaporated (TE) ZnS, TE CdTe, electron beam evaporated (EBE) CdTe and in-situ CdTe/ZnTe grown by MBE. The SIMS profiles and TEM characterization indicate: For TE ZnS BCLs, there exists an optimized thickness to obtain the deepest As indiffusion after high temperature annealing, and the end-of-range (EOR) depth is linearly proportional to the thickness ratio of a-MCT layer/damage layer. For TE CdTe BCLs, the barrier layer induced channeling effect (BLICE) occurs to the thin BCL samples, while this effect is suppressed in the thick BCL samples. The phenomenon might be due to that the blocking effect of the layered structure inside each crystal column becomes dominate in the thick BCL samples. Additionally, the EBE CdTe BCL with layered structure can suppress effectively the BLICE effect; in the in-situ CdTe/ZnTe BCL, the short defect layer generated in the CdTe buffer layer and the amorphization of the ZnTe layer during ion implantation also play a significant role in suppressing the BLICE effect.","PeriodicalId":222501,"journal":{"name":"SPIE Defense + Security","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121023530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Study on reflow process of SWIR FPA during flip-chip bonding technology 倒装键合工艺中SWIR FPA回流过程的研究

SPIE Defense + Security Pub Date : 2016-05-20 DOI: 10.1117/12.2223021

Cui Fan, Xue Li, X. Shao, Zhiheng Zeng, Hengjing Tang, Tao Li, H. Gong

引用次数: 1

A 400 KHz line rate 2048-pixel stitched SWIR linear array 一个400khz线率2048像素拼接SWIR线性阵列

SPIE Defense + Security Pub Date : 2016-05-20 DOI: 10.1117/12.2223696

A. Anchlia, R. Vinella, Daphne Gielen, K. Wouters, Vincent Vervenne, Peter Hooylaerts, P. Deroo, W. Ruythooren, D. De Gaspari, J. Das, P. Merken

{"title":"A 400 KHz line rate 2048-pixel stitched SWIR linear array","authors":"A. Anchlia, R. Vinella, Daphne Gielen, K. Wouters, Vincent Vervenne, Peter Hooylaerts, P. Deroo, W. Ruythooren, D. De Gaspari, J. Das, P. Merken","doi":"10.1117/12.2223696","DOIUrl":"https://doi.org/10.1117/12.2223696","url":null,"abstract":"Xenics has developed a family of stitched SWIR long linear arrays that operate up to 400 KHz of line rate. These arrays serve medical and industrial applications that require high line rates as well as space applications that require long linear arrays. The arrays are based on a modular ROIC design concept: modules of 512 pixels are stitched during fabrication to achieve 512, 1024 and 2048 pixel arrays. Each 512-pixel module has its own on-chip digital sequencer, analog readout chain and 4 output buffers. This modular concept enables a long array to run at a high line rates irrespective of the array length, which limits the line rate in a traditional linear array. The ROIC is flip-chipped with InGaAs detector arrays. The FPA has a pixel pitch of 12.5μm and has two pixel flavors: square (12.5μm) and rectangular (250μm). The frontend circuit is based on Capacitive Trans-impedance Amplifier (CTIA) to attain stable detector bias, and good linearity and signal integrity, especially at high speeds. The CTIA has an input auto-zero mechanism that allows to have low detector bias (<20mV). An on-chip Correlated Double Sample (CDS) facilitates removal of CTIA KTC and 1/f noise, and other offsets, achieving low noise performance. There are five gain modes in the FPA giving the full well range from 85Ke- to 40Me-. The measured input referred noise is 35e-rms in the highest gain mode. The FPA operates in Integrate While Read mode and, at a master clock rate of 60MHz and a minimum integration time of 1.4μs, achieves the highest line rate of 400 KHz. In this paper, design details and measurements results are presented in order to demonstrate the array performance.","PeriodicalId":222501,"journal":{"name":"SPIE Defense + Security","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125925573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Pyxis handheld polarimetric imager Pyxis手持式偏振成像仪

SPIE Defense + Security Pub Date : 2016-05-20 DOI: 10.1117/12.2226031

D. Chenault, J. Pezzaniti, Justin P. Vaden

{"title":"Pyxis handheld polarimetric imager","authors":"D. Chenault, J. Pezzaniti, Justin P. Vaden","doi":"10.1117/12.2226031","DOIUrl":"https://doi.org/10.1117/12.2226031","url":null,"abstract":"The instrumentation for measuring infrared polarization signatures has seen significant advancement over the last decade. Previous work has shown the value of polarimetric imagery for a variety of target detection scenarios including detection of manmade targets in clutter and detection of ground and maritime targets while recent work has shown improvements in contrast for aircraft detection and biometric markers. These data collection activities have generally used laboratory or prototype systems with limitations on the allowable amount of target motion or the sensor platform and usually require an attached computer for data acquisition and processing. Still, performance and sensitivity have been steadily getting better while size, weight, and power requirements have been getting smaller enabling polarimetric imaging for a greater or real world applications. In this paper, we describe Pyxis®, a microbolometer based imaging polarimeter that produces live polarimetric video of conventional, polarimetric, and fused image products. A polarization microgrid array integrated in the optical system captures all polarization states simultaneously and makes the system immune to motion artifacts of either the sensor or the scene. The system is battery operated, rugged, and weighs about a quarter pound, and can be helmet mounted or handheld. On board processing of polarization and fused image products enable the operator to see polarimetric signatures in real time. Both analog and digital outputs are possible with sensor control available through a tablet interface. A top level description of Pyxis® is given followed by performance characteristics and representative data.","PeriodicalId":222501,"journal":{"name":"SPIE Defense + Security","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121753857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

High definition 10μm pitch InGaAs detector with asynchronous laser pulse detection mode 具有异步激光脉冲检测模式的高清晰度10μm间距InGaAs探测器

SPIE Defense + Security Pub Date : 2016-05-20 DOI: 10.1117/12.2222762

R. Fraenkel, E. Berkowicz, L. Bykov, R. Dobromislin, R. Elishkov, A. Giladi, I. Grimberg, I. Hirsh, E. Ilan, C. Jacobson, I. Kogan, P. Kondrashov, I. Nevo, I. Pivnik, S. Vasserman

{"title":"High definition 10μm pitch InGaAs detector with asynchronous laser pulse detection mode","authors":"R. Fraenkel, E. Berkowicz, L. Bykov, R. Dobromislin, R. Elishkov, A. Giladi, I. Grimberg, I. Hirsh, E. Ilan, C. Jacobson, I. Kogan, P. Kondrashov, I. Nevo, I. Pivnik, S. Vasserman","doi":"10.1117/12.2222762","DOIUrl":"https://doi.org/10.1117/12.2222762","url":null,"abstract":"In recent years SCD has developed InGaAs/InP technology for Short-Wave Infrared (SWIR) imaging. The first product, Cardinal 640, has a 640x512 (VGA) format at 15μm pitch, and more than a thousand units have already been delivered. We now present Cardinal 1280, having the smallest pitch available today (10μm), with a 1280x1024 (SXGA) format. Cardinal 1280 addresses both long-range daylight imaging, and passive or active imaging in Low Light Level (LLL) conditions. The Readout Integrated Circuit supports snapshot imaging at 13 bit resolution with a frame rate of 160Hz at full format, or a frame rate of 640Hz with 2x2 binning. It also has a Low Noise Imaging (LNIM) mode with 35ereadout noise with internal Correlated Double Sampling (CDS). An asynchronous Laser Pulse Detection (ALPD) mode is implemented with 2x2 binning in parallel to SWIR imaging (with 10 μm resolution). The new 10 μm pixel is sensitive down to the visible (VIS) spectrum, with a typical dark current of ~ 0.5fA at 280K, and a quantum efficiency >80% at 1550nm. The Focal Plane Array is integrated into a ruggedized, high vacuum integrity, metallic package, with a Thermo- Electric Cooler (TEC) for optimized performance, and a high grade Sapphire window. In this paper we will present the architecture and preliminary measurement results.","PeriodicalId":222501,"journal":{"name":"SPIE Defense + Security","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115845881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9