基于ARM的远程视频监控系统设计

着眼视频监控网络化发展需求,开发了一种基于ARM的远程视频监控系统;系统的硬件以ARM S3C2440嵌入式芯片为核心,设计了硬件系统的电源、以太网接口、JTAG接口、数据存储等主要模块的电路结构;系统的软件以Linux为操作系统,利用Vide-o4Linux完成视频图像的采集,采用JPEG图像压缩技术实现视频的压缩处理,并用实时传输协议RTP实现对视频图像的封装和网络传输、控制;测试结果表明,该视频监控系统硬件结构小、功耗低、占用资源少,启动时间仅需20ms,网络实时视频图像传输速率达到25～30fps,实现了远程视频图像的实时网络化传输,具有一定的实用价值。     

基于StrongARM的视频采集与处理系统

介绍一个基于StrongARM的视频数据采集处理系统。该系统将采集到的连续视频图像数据以MJPEG的方式进行压缩处理,然后由StrongARM进行打包处理,生成UDP包,向网络发送。视频服务器可以通过网络(局域网或广域网)获取视频采集器发送的图像数据,并对图像数据进行显示、存储、回放等管理,同时视频服务器也可以通过网络控制视频采集器上的摄像机及云台。该系统为实现远程实时监控系统,对监控数据的数字化管理以及视频网络传输等提供了解决方案,它以最新的MJPEG压缩方式使视频数据的管理更加方便可靠,并且使用Intel公司的StrongARMSA-1110高性能微处理器芯片作为处理平台,使得该系统具有安装方便、配置灵活、便于携带等突出优点,具有很大的市场应用前景。     

Cortex-A8和H.264的无线视频监控系统设计

设计了一种基于Cortex-A8和H.264编码的无线视频监控系统.系统包含视频监控PC客户端、无线传输网络和视频采集端.视频采集端采用基于ARM Cortex-A8内核的SP5V210芯片作为中央处理器,并构建Linux系统对视频图像进行采集、H.264编码和无线传输,已编码压缩的图像数据通过实时传输协议RTP传输到视频监控PC客户端进行解码和显示.该系统具有组建快捷、灵活性强等特点,能够稳定地运行且满足设计要求,在安防系统和紧急救援系统中有着很好的应用前景.     

基于ADV202的实时窄信道视频压缩及解压缩系统设计

为了满足视频传输的高实时性和无线信道的窄信道要求,设计了一种基于JPEG2000的视频压缩及解压缩系统。通过专用芯片ADV202实现JPEG2000压缩方式,其优点是在窄信道下具有高实时性。使用FPGA实现跳像素并通过配置ADV202寄存器实现跳场减少数据,满足了窄信道下实现较低压缩率压缩视频图像的要求,提高了视频图像还原质量。     

基于FPGA的视频监控系统

设计并实现了一个基于FPGA的视频监控系统。在FPGA中设计I2C总线配置模块对视频芯片ADV7181进行合理的配置,介绍了视频信号的处理过程,包括ITUR656视频解码、视频插值、解交织和色度空间变换。处理后的视频一路通过VGA接口在本地显示器上显示,另外一路经过压缩后通过网络传输到网络终端,从而实现网络远程监控。     

一种采用小波变换的实时视频压缩系统

为了对视频图像进行实时有效的压缩,提出了一种基于小波变换的视频实时压缩编码系统。该系统以小波变换技术为核心,首先采用ADV612实时压缩编码芯片对视频图像进行硬件压缩编码处理;然后结合高速数字信号处理器—TMS320VC5509对分辨率为760×420和帧速为25 fps的视频信号进行了实时压缩编码。实验结果表明,该系统的性能指标达到512 kbps~15 Mbps的设计要求,并具有实时性高、结构简单和扩展性好等优点。     

Hi3507与流媒体服务器的视频监控系统设计

网络视频监控系统不仅要求采集的图像清晰度要高,而且对视频图像的压缩和传输都有很高的要求。本设计选取海思SoC Hi3507为主芯片,结合CMOS高清图像传感器OV2643、H.264编码技术和基于live555的流媒体服务器搭建了一个高清网络视频监控系统。实践表明,该系统不仅采集到的图像清晰流畅、实时性好,而且具有较高的性价比。     

基于ARM+DSP的网络视频服务器的设计

网络视频服务器可对音视频数据进行编码处理并完成网络传输,实现远程监控。为了达到对高尺寸的图像进行全屏的视频压缩或无失真的压缩,并且实现图像数据在网络的高效传输,可采用一种ARM+DSP的网络视频服务器,采用TI公司高性能的DSP芯片TMS320C6415-500进行图像数据处理,用Intel公司的Strong ARM SA1110芯片掌控系统管理与网络传输。用ARM+DSP设计的网络视频服务器,采用H.264视音频压缩编码算法,图像分辨率为352×288象素,可同时访问4个网络摄像机,并输出4路视频信号,内置Webserver实现网上浏览。用ARM+DSP设计网络视频服务器是一种先进且高效的方案。     

双DSP的多路视频监控系统设计

采用两片TI公司的专用视频处理芯片TMS320DM642设计了一种多路视频监控系统.其中,DSPI与视频采集芯片SAA7113共同完成多路视频的采集,并拼接成一路视频图像输出;DSP2完成对DSP1输出图像的采集、压缩和视频传输.该方案结构灵活、拓展性强,可以实现4路视频的实时采集与传送.     

基于MPEG-2的图像压缩系统设计

针对未压缩的视频图像信号的高传输码率,占用存储空间大进行了研究,提出了一种基于MPEG—2的图像压缩编码系统,实现数字图像的无线传输,并输出传输流。通过视频解码芯片SAA7114H和编码芯片SAA6752H构成压缩模块,分析原始视频图像,经D1格式采集压缩后,分别以不同的速率传输时,视频图像质量变化,表明压缩倍数越高,图像质量越差;由SAA6752芯片引脚采集数据,将采集到的视频流数据转换为十六进制,分析数据结构及排列规律符合传输流特性。该设计方法不仅能保证良好的图像质量,提高视频图像压缩率,且能正确提取传输流。     

VCMF: A Framework for Video Content Modeling

Current approaches to modeling the structure and semantics of video recordings restrict its reuse. This is because these approaches are either too rigidly structured or too generally structured and so do not represent the structural and semantic regularities of classes of video recordings. This paper proposes a framework which tackles the problem of reuse by supporting the definition of a wide range of models of video recordings and supporting reuse between them. Examples of the framework's use are presented and examined with respect to different kinds of reuse of video, current research, and the development of a toolset to support the framework.     

The Application of Video Semantics and Theme Representation in Automated Video Editing

This paper considers the automated generation of humorous video sequences from arbitrary video material. We present a simplified model of the editing process. We then outline our approach to narrativity and visual humour, discuss the problems of context and shot-order in video and consider influences on the editing process. We describe the role of themes and semantic fields in the generation of content oriented video scenes. We then present the architecture of AUTEUR, an experimental system that embodies mechanisms to interpret, manipulate and generate video. An example of a humorous video sequence generated by AUTEUR is described.     

Model-Based Video Classification toward Hierarchical Representation,Indexing and Access

In this paper, we develop a content-based video classification approach to support semantic categorization, high-dimensional indexing and multi-level access. Our contributions are in four points: (a) We first present a hierarchical video database model that captures the structures and semantics of video contents in databases. One advantage of this hierarchical video database model is that it can provide a framework for automatic mapping from high-level concepts to low-level representative features. (b) We second propose a set of useful techniques for exploiting the basic units (e.g., shots or objects) to access the videos in database. (c) We third suggest a learning-based semantic classification technique to exploit the structures and semantics of video contents in database. (d) We further develop a cluster-based indexing structure to both speed-up query-by-example and organize databases for supporting more effective browsing. The applications of this proposed multi-level video database representation and indexing structures for MPEG-7 are also discussed.     

一种整体的视频匹配方法

给出一种视频时空配准的整体方法,提出一种视频内匹配与视频间匹配相结合的空间配准策略,改进动态时间扭曲方法以用于时间维的对齐.视频内匹配跟踪视频内各帧图像的特征点并记录其轨迹,视频间匹配配准不同视频的帧图像,使用轨迹对应提供图像配准所需的初始特征点对应,根据图像配准得到的特征点对应建立和更新轨迹对应.该匹配策略充分利用了视频的连贯性提高了匹配的稳定性和效率,同时提高了配准视频的连贯性.改进的动态时间扭曲方法通过极小化两段视频的整体距离建立视频之间的帧对应关系,保持视频内部各帧之间的时序关系并能处理非线性偏移     

Columbia's VoD and Multimedia Research Testbed with Heterogeneous Network Support

This paper reports our progress in developing an advanced video-on-demand (VoD) testbed, which will be used to accommodate various multimedia research and applications such as Electronic News on Demand, Columbia's Video Course Network, and Digital Libraries. The testbed supports delivery of MPEG-2 audio/video stored as transport streams over various types of networks, e.g., ATM, Ethernet, and wireless. Both software and hardware video encoders/decoders are used in the testbed. A real-time video pump and a distributed application control protocol (MPEG-2's DSM-CC) have been incorporated. Hardware decoders and set-tops are being used to test wide-area video interoperability. Our VoD testbed also provides an advanced platform for implementing proof-of-concept prototypes of related research. Our current research focus covers video transmission with heterogeneous quality-of-service (QoS) provision, variable bitrate (VBR) traffic modeling, VBR server scheduling, video over Internet, and video transmission over IP-ATM hybrid networks. An important aim is to enhance interoperability. Accommodation of practical multimedia applications and interoperability testing with external VoD systems has also been undertaken.     

Metadata-driven interactive web video assembly

The recent expansion of broadband Internet access led to an exponential increase of potential consumers of video on the Web. The huge success of video upload websites shows that the online world, with its virtually unlimited possibilities of active user participation, is an ideal complement to traditional consumption-only media like TV and DVD. It is evident that users are willing to interact with content-providing systems in order to get the content they desire. In parallel to these developments, innovative tools for producing interactive, non-linear audio-visual content are being created. They support the authoring process alongside management of media and metadata, enabling on-demand assembly of videos based on the consumer’s wishes. The quality of such a dynamic video remixing system mainly depends on the expressiveness of associated metadata. Eliminating the need for manual input as far as possible, we aim at designing a system which is able to automatically enrich its own media and metadata repositories continuously. Currently, video content remixing is available on the Web mostly in very basic forms. Most platforms offer upload and simple modification of content. Although several implementations exist, to the best of our knowledge no solution uses metadata to its full extent to dynamically render a video stream based on consumers’ wishes. With the research presented in this paper, we propose a novel concept to interactive video assembly on the Web. In this approach, consumers may describe the desired content using a set of domain-specific parameters. Based on the metadata the video clips are annotated with, the system chooses clips fitting the user criteria. They are aligned in an aesthetically pleasing manner while the user furthermore is able to interactively influence content selection during playback at any time. We use a practical example to clarify the concept and further outline what it takes to implement a suchlike system.

Detecting Roads in Stabilized Video with the Spatio-Temporal Structure Tensor

Video provides strong cues for automatic road extraction that are not available in static aerial images. In video from a static camera, or stabilized (or geo-referenced) aerial video data, motion patterns within a scene enable function attribution of scene regions. A “road”, for example, may be defined as a path of consistent motion — a definition which is valid in a large and diverse set of environments. The spatio-temporal structure tensor field is an ideal representation of the image derivative distribution at each pixel because it can be updated in real time as video is acquired. An eigen-decomposition of the structure tensor encodes both the local scene motion and the variability in the motion. Additionally, the structure tensor field can be factored into motion components, allowing explicit determination of traffic patterns in intersections. Example results of a real time system are shown for an urban scene with both well-traveled and infrequently traveled roads, indicating that both can be discovered simultaneously. The method is ideal in urban traffic scenes, which are the most difficult to analyze using static imagery.     

海量监控视频快速回放与检索技术

为解决海量监控视频的快速浏览和检索,介绍了一种基于目标索引的视频摘要和检索方法。该方法在光流分析的基础上,在画面的静止区域更新背景,运动的区域利用差分法分割出运动目标图像。经过优化的快速特征匹配和建立运动跟踪模型后,根据目标运动轨迹,按照时空距离进行聚类。在目标图像数据和运动参数进行XML结构化存储为索引的基础上,最后在检索时将符合条件的所有目标图像,按照其原有时间顺序逐帧贴到同一个背景图像中,形成动态的摘要视频。由于该方法剔除了背景中大量的时空冗余信息,可在较短回放时间内浏览全部有用目标,显著提高海量监控视频的查阅效率。     

VisualGREP: A Systematic Method to Compare and Retrieve Video Sequences

Multimedia Tools and Applications - In this paper, we consider the problem of similarity between video sequences. Three basic questions are raised and (partially) answered. Firstly, at what...     

基于VFW的远程视频捕获技术研究

多媒体技术在人们日常生活中的应用越来越广泛,图像、视频、音频等多媒体数据逐渐成为信息处理领域中主要的信息媒体形式。视频捕获技术是信息处理中的重要环节,研究该项技术具有重要的实用价值。文章提出一种基于VFW的远程视频捕获方法。该方法利用VFW捕获视频数据,采用H.263编码标准压缩视频数据,利用面向连接协议的流式套接字实现实时视频流的传输,结合多线程技术实现视频文件播放。然后,基于Windows操作系统设计实现了远程视频捕获系统。实验结果表明,该方法CPU占用率低、内存占用小,可靠性强,具有较好的应用价值。