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提出一种根据PCA重构图像与原目标相关等级进行的目标识别方法,解决伪目标参与识别影响识别准确度的问题。首先建立目标模板库特征空间,将定位到的目标对象映入特征空间,利用PCA变换进行图像重构,定义降维重构图像与原目标之间的相关度函数,根据该函数判别图像等级;若原目标与其重构图像相似度很低,认定原目标为伪目标,将其剔除,不进入识别过程;若认定为真实目标后,根据相似性程度,分别选用降维重构图像或原图像作为识别对象,利用Hu不变矩距离分类器进行识别。该方法可有效剔除伪目标,并根据图像质量选用识别目标,提高了目标识别准确度,交通卡口获取的实测车辆图像车标识别试验验证了该方法的鲁棒性和有效性。 相似文献
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雷达距离高分辨特性,即目标的一维高分辨距离像特性,能够体现目标的形状及结构信息,且易获取,有利于对目标进行准确识别,这已成为目前雷达目标识别领域的一个重要研究方向。开展目标一维高分辨特性研究的一个重要基础是测量,因而通过测量目标的一维高分辨距离像并分析目标特性,对目标识别具有重大理论意义与实际应用价值。基于此,文章利用实验室现有全相参新体制雷达导引头目标测量平台,对海面舰船目标的距离高分辨特性进行了初步实测,获取了海面舰船的米级高分辨距离像,为今后深入开展海面舰船目标识别研究奠定了坚实基础。 相似文献
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在研究了单极化条件下高分辨率距离像的目标识别后,给出一种利用目标全极化信息的投票识别方法。实验结果表明,该方法具有较高的识别率。 相似文献
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形状特征是目标识别的重要参数,小波变换的低频部分代表物体的总体形状特征,而图像中的噪声主要分布于高频部分。根据这一特征,利用小波变换消除噪声提取目标形状,进而利用特征不变矩距离进行分类,实现目标识别,将该方法应用在实测车标图像的识别中,结果表明识别效果较好。 相似文献
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对雷达数字信息进行识别,识别率高达98.7%.对于摄取的图像通过选取阈值进行二值化,在第一次分割中从背景中提取数字图像信息,第二次分割采用统计投影直方图方法,把单个数字字符图像分割开,将图像大小规范化,提取轮廓,采用方向线素特征提取,通过欧式距离分类器方法进行识别.引入信度函数,对识别结果进行分析,提高了字符识别率. 相似文献
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论证了结构自由振动的有限离散频谱可以作为结构频响函数而直接用频域法识别结构模态参数,实现了时域和频域识别技术的有机结合。仿真和实际结构的识别试验证明了这一论证的正确性。 相似文献
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本文介绍了机载雷达目标识别技术的现状,以及现有机载雷达所采取的目标识别技术,并用试验验证了机载雷达对岛屿与小型船只的分类能力。说明应用步进频体制可实现对目标与背景的高分辨距离成像,通过该体制可提取出目标的距离维尺度特征。该技术可用于区分海域中的岛礁、小型舰艇、大型舰船等尺度差异较大的目标与背景。 相似文献
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分析了飞机各管路系统中导管标带识别、涂色识别和印章识别传统方法的不足,提出了采用激光刻制导管图号标记的新方法,阐明其基本原理和方法,并与传统方法作了比较分析。激光刻制方法使设计人员不用再在图样上注明导管的标志和辅助标志,减轻了设计的工作量,提高了工作效率,缩短了导管制造周期;同时减轻了飞机的重量,改善飞机性能;标记清晰、美观易认,有利于飞机的检查和维修。 相似文献
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Superresolution HRR ATR with high definition vector imaging 总被引:1,自引:0,他引:1
Nguyen D. Benitz G. Kay J. Orchard B. Whiting R. 《IEEE transactions on aerospace and electronic systems》2001,37(4):1267-1286
A new 1-D template-based automatic target recognition (ATR) algorithm is developed and tested on high range resolution (HRR) profiles formed from synthetic aperture radar (SAR) images of targets taken from the Moving and Stationary Target Acquisition and Recognition (MSTAR) data set. In this work, a superresolution technique known as High Definition Vector Imaging (HDVI) is applied to the HRR profiles before the profiles are passed through ATR classification. The new I-D ATR system using HDVI demonstrates significantly improved target recognition compared with previous I-D ATR systems that use conventional image processing techniques. This improvement in target recognition is quantified by improvement in probability of correct classification (PCC). More importantly, the application of HDVI to HRR profiles helps to maintain the same ATR performance with reduced radar resource requirements 相似文献
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The fundamental problems of automatic target recognition (ATR) are discussed. A new approach to ATR is suggested that includes: a new method of scoring ATR performance, a new concept of artificial images, a new method called probing for extracting target signature knowledge from image experts, and suggestions for coping with the problem of insufficient test data and algorithm obsolescence 相似文献
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《IEEE transactions on aerospace and electronic systems》2002,38(2):632-648
A framework which allows for the direct comparison of alternate approaches to automatic target recognition (ATR) from synthetic aperture radar (SAR) images is described and applied to variants of several ATR algorithms. This framework allows comparisons to be made on an even footing while minimizing the impact of implementation details and accounts for variation in image sizes, in angular resolution, and in the sizes of orientation windows used for training. Alternate approaches to ATR are characterized in terms of the best achievable performance as a function of the complexity of the model parameter database. Several approaches to ATR from SAR images are described and the performance achievable by each for a range of database complexities is studied and compared. These approaches are based on a likelihood test under a conditionally Gaussian model, log-magnitude least squared error, and quarter power least squared error. All approaches are evaluated for a wide range of parameterizations and the dependence on these parameters of both the resulting performance and the resulting database complexity is explored. Databases for all of the approaches are trained using identical sets of images and their performance is assessed under identical testing scenarios in terms of probability of correct classification, confusion matrices, and orientation estimation error. The results indicate that the conditionally Gaussian approach outperforms the other two approaches on average for both target recognition and orientation estimation, that accounting for radar power fluctuation improves performance for all three methods, and that the conditionally Gaussian approach normalized for power delivers average performance that is equal or superior to all other considered approaches 相似文献
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在ISAR距离对准频域法的基础上,提出了一种新的ISAR运动补偿法。它将距离对准和相位补偿同时进行,因而能够简化运动补偿环节,减少运动补偿计算量。从理论上证明了所采用的相位补偿法与多普勒中心跟踪法是等效的。最后利用ISAR外场实测数据和微波暗室数据进行了验证,并且考察了所述方法的噪声性能。 相似文献
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Williams R. Westerkamp J. Gross D. Palomino A. 《Aerospace and Electronic Systems Magazine, IEEE》2000,15(4):37-43
Synthetic Aperture Radar (SAR) imaging and Automatic Target Recognition (ATR) of moving targets pose a significant challenge due to the inherent difficulty of focusing moving targets. As a result, ATR of moving targets has recently received increased interest. High Range Resolution (HRR) radar mode offers an approach for recognizing moving targets by forming focused HRR profiles with significantly enhanced target-to-(clutter+noise) (T/(C+N)) via Doppler filtering and/or clutter cancellation. A goal of HRR ATR transition is the implementation and evaluation of algorithms exhibiting robustness under extended operating conditions (EOC). The public domain Moving and Stationary Target Acquisition and Recognition (MSTAR) data set was used to study 1D template-based ATR development and performance. Due to the unavailability of a statistically significant moving ground target data set, this approach was taken as an interim step in assessing the separability of ground targets when using range only discriminants. This report summarizes the data and algorithm methodology, simulated performance results, and recommendations 相似文献
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飞行器红外隐身效能工程评价方法 总被引:3,自引:1,他引:2
针对飞行器的红外隐身问题,推导出红外辐射对比度与作用距离的理论关系,采用指数拟合获得大气透过率与作用距离的近似关系表达式,简化了对作用距离的计算,并通过实际算例考察了目标表面温度、目标发射率和飞行速度对红外辐射对比度及作用距离的影响。结果表明:对比度和作用距离随目标表面温度、发射率及飞行速度的下降趋势基本一致;在一定条件下,对比度可代替作用距离作为评价目标红外隐身效果的简单、快速的参数,对比度越小目标的红外隐身效果越好。对比度的计算快速、准确、灵活性强和适用范围广,为今后进一步对飞行器的红外隐身研究提供一定的理论参考。 相似文献