基于智能监控系统的视频图像质量检测的研究与实现

VideoImageQualityDetectionResearchandImplementationBasedonIntelligentMonitoringThesisSubmittedtoNanjingUniversityofPostsandTelecommunicationsfortheDegreeofMasterofEngineeringByFangfangSupervisor:Prof.GongJianrongApril2013I摘要在倡导平安生活的当今社会，视频监控系统已经应用在我们身边的各种领域了。随着监控系统使用数量的增多，以及人们对监控准确度要求的提高，势必会大幅增加监控人员的工作量。在视频监控设备对图像采集、压缩、传输和存储的过程中，图像会出现失真和降质的现象，严重的甚至会造成监控失效。所以对视频图像的质量进行把关，对监控设备进行维护是当下的监控工作人员的首要工作之一。视频质量检测系统就是为了提高监控效率减少监控者工作时间而研发的。本文探讨了一些常见的图像失真类型的特征，其中包括：图像模糊、偏色、亮度异常、噪声、信号缺失等，实现了相应的检测算法。另外，对于图像的异物遮挡和前端被动挪移等人为破坏的现象，也制定了相关算法进行检测。文章着重对图像模糊和异物遮挡这两种现象进行详细的分析，比较当前对此类异常已有的检测方法，将其简化改进之后用代码实现，然后通过实验验证算法的效果。实验结果表明，本文提出的算法检测结果较准确，且实用性高，适合在实时的监控系统中应用。安防工作人员通过本系统可随时监控摄像头的工作状态，当监控的视频图像出现异常时，系统发出警报，并将出现的异常类型显示在图像上，提醒工作人员进行相应的处理。如此便有利于工作人员及时对监控设备进行有效的维护，提高工作的效率。关键词:智能监控视频质量检测图像模糊异物遮挡IIAbstractInnowadayssocietywhichisadvocatedpeacelife,videomonitoringsystemhasbeenusedinkindsoffieldswidelyallaroundus.Asthenumberoftheuseofmonitoringsystemincreasedandpeople’ssafemonitoraccuracyrequirementsimproved,monitorsworkloadhasbeensignificantlygrowed.Duringtheimageacquisition,compression,transmissionandstorageofvideomonitoringequipment,theimagedistortionandquailtydegradationwillappear.Oneofmonitors’highestprioritiesismaintenancemonitoringequipmenttocontroltheimagequality.Thispaperputforwardthecorrespondingdetectionalgorithmforsomecommonimagedistortiontypes,including:imagefuzzy,partialcolor,brightnessanomaly,imagenoise,signallossandsoon.Inaddition,someman-madesabotagesituationslikecamerabeshadedbyforeignobjects,orcamerabemoved,alsohasdetectionalgorithmtotest.Thispaperfocusesonimagefuzzyandshaded.Existingalgorithmissimplifiedandimproved,andthecorrectnessofthisalgorithmisconfirmedbyaseriesofexperiment.Theresultsshowthatthisalgorithmusedinreal-timemonitoringsystemishighlyappropriate.Monitoringstaffscansurveilancecamerasworkingconditionatanytimethroughthissystem.Ifabnormalphenomenonappears,thesystemwillalarmtoremindstaffstohandleit.Itishelpfultomaintenanceworkersrepairtheequipmenttimelytoimprovetheworkefficiency.Keywords:IntelligentMonitoring,VideoQualityTesting,ImageFuzzy,ShadedbyForeignObjects.III目录第一章绪论.............................................................................................................................................................11.1课题研究的背景和意义............................................................................................................................11.2相关领域的研究现状................................................................................................................................21.2.1视频图像质量评价方法.................................................................................................................21.2.2无参考评价方法发展现状.............................................................................................................31.3本论文的研究内容及结构安排................................................................................................................41.3.1论文的研究内容.............................................................................................................................41.3.2论文的结构安排.............................................................................................................................4第二章视频质量检测系统的结构和功能.............................................................................................................62.1视频质量检测系统的整体结构................................................................................................................62.2各检测模块的具体功能............................................................................................................................72.2.1模糊检测.........................................................................................................................................72.2.2偏色检测.........................................................................................................................................72.2.3噪声检测.........................................................................................................................................92.2.4亮度检测.......................................................................................................................................102.2.5信号缺失检测...............................................................................................................................102.2.6异物遮挡检测................................................................................................................................112.2.7前端移动检测................................................................................................................................11第三章视频模糊度的评价和检测.......................................................................................................................133.1图像模糊度的评价方法..........................................................................................................................133.1.1图像的边缘分类及检测............................................................................................................