基于支持向量机的交通视频人车识别研究

提出一种静止摄像机条件下车辆和行人的支持向量机(SVM)识别方法。首先根据背景差分法对监控视频中的运动目标进行检测,提取出运动目标的基本轮廓,然后利用数学形态学方法对目标进一步检测处理。用星形向量表示法对运动目标提取8个特征,以及高度、宽度和高宽比作为另外3个特征,通过构造SVM分类器,实现了基于SVM的图像分类和识别。实验结果表明,该方法能够在视频监控中快速准确地对运动的车辆和行人进行检测和分类,平均识别率达到96.97%。     

基于互信息量均方差提取关键帧的激光视频图像检索研究

为保证激光视频图像检索结果中不存在重复性冗余图像,提出了基于互信息量均方差提取关键帧的激光视频图像检索方法。基于互信息量均方差的关键帧提取方法,以激光视频图像颜色的互信息量均方差最大化,为激光视频图像关键帧的聚类中心设置标准,以此聚类提取不重复的视频图像关键帧;通过基于关键帧的激光视频图像检索方法,将所提取关键帧作为激光视频图像检索的核心判断内容,提取与所需图像关键帧相似度显著的激光视频图像,完成激光视频图像检索。实验结果显示：此方法使用后,提取的激光视频图像关键帧冗余度仅有0.01,激光视频图像检索结果的MAP指标测试值高达0.98,检索结果中不存在重复性冗余图像。     

基于Map/Reduce的海量视频图像检索系统设计

【】针对齐齐哈尔市公安视频监控系统中每天所产生的大量视频数据,这对视频图像的检索、管理及安全产生了迫切的需求,视频图像的检索存在两个急需解决的问题,一个是视频检索的准确度的问题,另一个是检索效率的问题。面对海量的视频数据库,本文提出了基于Map/Reduce分布式计算模型与关键帧算法的结合。既提高检索效率,又提高了检索的准确率。     

远程视频监控图像自动标注优化方法

对远程视频监控图像进行自动标注,实现视频监控中关键帧识别,提高视频信息的分析鉴别能力。提出一种基于远程视频监控图像多尺度关键帧提取的自动标注优化方法,首先构建视频图像的采集模型,然后对采集的图像进行小波降噪处理,对输出的降噪图像通过多尺度关键帧提取进行自动标注,实现图像特征提取和信息识别。仿真结果表明,采用该方法进行远程视频监控图像自动标注,提高了对图像信息的检测识别能力,图像的输出峰值信噪比较高,准确识别概率提高。     

一种基于聚类的关键帧提取算法

关键帧的提取是视频数据结构化的一部分,在获得关键帧之后就可以进入基于内容的图像检索阶段,实现基于内容的视频检索。本文提出了一种在镜头边界检测之后再进行视频帧聚类的方法来提取关键帧。聚类形成了数据更小的子镜头,最后从子镜头中选择与聚类中心距离最小的一帧作为关键帧。最后,通过仿真实验表明该方法能够快速有效地提取出视频关键帧。     

基于灰度与关键帧光流检测的视频异常判断

视频监控系统在日常生活中日益普及，为了实现监控视频的智能分析，利用背景差分法检测并提取关注的前景目标，再结合光流算法分析目标的运动方向和强度，为了提升视频分析效率，先利用帧差欧几里得距离法计算帧与帧之间的相似度，提取视频序列的关键帧，并提出了一种运算量小检测效果较好的基于图像灰度化的背景差分法进一步提取关键帧的前景目标,最后用光流法计算得到目标的光流矢量和强度信息，为监控视频的异常判断提供依据。     

基于运动轨迹分析的监控视频关键帧提取

当前,从海量监控视频中高效、准确地提取关键帧是一项极具挑战性的课题,为此提出了一种基于运动轨迹分析的监控视频关键帧提取方法.给出了该方法的实现过程,并进行了实验与分析.结果表明,所提出的方法在关键帧提取准确性上优于当前的主流方法.     

基于综合特征分析的视频关键帧检索

综合利用了图像的颜色、形状和纹理特征,实现了对视频关键帧进行基于内容的检索。首先研究关键帧的选取、特征匹配等问题,再从视频处理的层次化结构的底层分析入手,构建了视频的连续帧图像序列,运用时间自适应检测法对镜头的关键帧进行了选取,建立了关键帧图像数据库。实验结果证明该方法性能良好。     

DDN前景提取结合映射模型学习的行人再识别

随着视频监控设备的广泛应用,行人再识别成为智能视频监控中的关键任务,具有广阔的应用前景。该文提出一种基于深度分解网络前景提取和映射模型学习的行人再识别算法。首先利用DDN模型对行人图像进行前景分割,然后提取前景图像的颜色直方图特征和原图像的Gabor纹理特征,利用提取的行人特征,学习不同摄像机之间的交叉映射模型,最后通过学习的映射模型将查寻集和候选集中的行人特征变换到一个特征分布较为一致的空间中,进行距离度量和排序。实验证明该算法能够提取较为鲁棒的行人特征,可克服背景干扰问题,行人再识别匹配率得到有效的提高。      

基于多特征融合的视频检索算法

随着视频等多媒体数据呈指数式迅猛增长,高效快速的视频检索算法引起越来越多的重视。传统的图像特征如颜色直方图以及尺度不变特征变换等对视频拷贝检测中检索速度以及检测精度等问题无法达到很好的效果,因此文中提出一种多特征融合的视频检索方法。该方法利用前后两帧的时空特征进行基于滑动窗口的时间对齐算法,以达到减少检索的范围和提高检索速度的目的。该算法对关键帧进行灰度序列特征、颜色相关图特征以及SIFT局部特征提取,然后融合全局特征和局部特征两者的优势,从而提高检测精度。实验结果表明,该方法可达到较好的视频检索精度。     

Efficient visual attention based framework for extracting key frames from videos

The huge amount of video data on the internet requires efficient video browsing and retrieval strategies. One of the viable solutions is to provide summaries of the videos in the form of key frames. The video summarization using visual attention modeling has been used of late. In such schemes, the visually salient frames are extracted as key frames on the basis of theories of human attention modeling. The visual attention modeling schemes have proved to be effective in video summarization. However, the high computational costs incurred by these techniques limit their applicability in practical scenarios. In this context, this paper proposes an efficient visual attention model based key frame extraction method. The computational cost is reduced by using the temporal gradient based dynamic visual saliency detection instead of the traditional optical flow methods. Moreover, for static visual saliency, an effective method employing discrete cosine transform has been used. The static and dynamic visual attention measures are fused by using a non-linear weighted fusion method. The experimental results indicate that the proposed method is not only efficient, but also yields high quality video summaries.     

Intelligent Mobile Video Surveillance System with Multilevel Distillation

This paper proposes a mobile video surveillance system consisting of intelligent video analysis and mobile communication networking. This multilevel distillation approach helps mobile users monitor tremendous surveillance videos on demand through video streaming over mobile communication networks. The intelligent video analysis includes moving object detection/tracking and key frame selection which can browse useful video clips. The communication networking services, comprising video transcoding, multimedia messaging, and mobile video streaming, transmit surveillance information into mobile appliances. Moving object detection is achieved by background subtraction and particle filter tracking. Key frame selection, which aims to deliver an alarm to a mobile client using multimedia messaging service accompanied with an extracted clear frame, is reached by devising a weighted importance criterion considering object clarity and face appearance. Besides, a spatial-domain cascaded transcoder is developed to convert the filtered image sequence of detected objects into the mobile video streaming format. Experimental results show that the system can successfully detect all events of moving objects for a complex surveillance scene, choose very appropriate key frames for users, and transcode the images with a high power signal-to-noise ratio (PSNR).     

基于运动统计和关键帧的视频检索方法

文章先对压缩视频直接进行镜头分割,然后选取熵值最大的镜头进行检索,通过对视频运动进行统计,把镜头运动量化到二维概率分布空间,选择距离与样本最较近的目标,大幅缩小检测范围,然后再进行关键帧比对,实现对视频的快速准确检索。     

基于视频去抖的室内开关柜状态识别

随着电力系统的发展,电力设备之间的关系变得越来越复杂,通过自动化设备来控制和保护电力系统的方法已经广泛应用于电气行业中,对设备自动化的要求也越来越高.该类要求不仅体现在设备控制方面的自动化,监控设备也要具备自动识别状态变化和自动预警的功能.监控相机在拍摄时往往由于机械原因产生抖动和摇摆,提出了一种基于视频去抖动的电气开关柜状态自动识别方法,在视频中识别开关柜面板,并将其作为感兴趣区域,对开关柜上不同子部件进行划分和检测.为了减小因相机在拍摄时由于机械原因产生的抖动和摇摆,本文利用了检测前后两帧图像中特征点的运动变化,平滑相机抖动,减小软件误检的概率,并对开关柜上子部件实施针对性的检测算法,提高准确率.实验结果表明,提出的电气开关柜监控算法具有不受相机晃动干扰,实时性强、检测准确以及抗干扰能力强的优点.     

SHIP: Cross-layer mobility management scheme based on Session Initiation Protocol and Host Identity Protocol

In law enforcement applications such as surveillance and forensics, video is often presented as evidence. It is therefore of paramount importance to establish the authenticity and reliability of the video data. This paper presents an intelligent video authentication algorithm which integrates learning based Support Vector Machine classification with Singular Value Decomposition watermarking. During video capture and storage, intrinsic local correlation information is extracted from the frames and embedded in the frames at local levels. Tamper detection and classification is performed using the inherent video information and embedded correlation information. The proposed algorithm is independent of the choice of watermark and does not require any key to store. Further, it is robust to global tampering such as frame addition and removal, local attacks such as object alteration and can differentiate between acceptable operations and malicious tampering. Experiments are performed on an extensive database which contains non-tampered videos and videos with several types of tampering. The results show that the proposed algorithm outperforms existing video authentication algorithms.     

Moving object detection in wavelet compressed video

In many surveillance systems the video is stored in wavelet compressed form. In this paper, an algorithm for moving object and region detection in video which is compressed using a wavelet transform (WT) is developed. The algorithm estimates the WT of the background scene from the WTs of the past image frames of the video. The WT of the current image is compared with the WT of the background and the moving objects are determined from the difference. The algorithm does not perform inverse WT to obtain the actual pixels of the current image nor the estimated background. This leads to a computationally efficient method and a system compared to the existing motion estimation methods.     

面向多区域视频监控的运动目标检测系统

为了实现视频监控现场多区域运动目标检测,分析了传统运动检测算法的不足,结合帧间差分法和背景差分法,提出背景动态更新的运动检测算法。该算法能自适应背景的变化,减少由背景变化造成的误检测。构建基于FPGA的视频监控系统,在FPGA上用该算法实现了640pixel×480pixel,30帧/s视频信号流的运动目标实时检测。系统提供了分区域运动目标检测的功能。检测区域的大小、位置和个数可通过简单的按键操作进行设定。测试结果表明,系统可以实时地对进入划定区域的运动目标进行检测和闪烁告警,且资源占用较少,适合在小规模的FPGA上进行实现。     

Video anomaly detection using CycleGan based on skeleton features

Anomaly detection is a challenging task in the field of intelligent video surveillance. It aims to identify anomalous events by monitoring the video captured by visual sensors. The main difficulty of this task is that the definition of anomalies is ambiguous. In recent years, most anomaly detection methods use a two-stage learning strategy, i.e., feature extraction and model building. In this paper, with the idea of refactoring, we propose an end-to-end anomaly detection framework using cyclic consistent adversarial networks (CycleGAN). Dynamic skeleton features are used as network constraints to alleviate the inaccuracy of feature extraction algorithms of a single generative adversarial network. In the training phase, only normal video frames and the corresponding skeleton features are used to train the generator and discriminator. In the testing phase, anomalous behaviors with high reconstruction errors can be filtered out by manually set thresholds. To the best of our knowledge, this is the first time CycleGAN has been used for video anomaly detection. Experimental results on challenging datasets show that our method can accurately detect anomalous behaviors in videos collected by video surveillance systems and is comparable to the current state-of-the-art methods.