共查询到20条相似文献,搜索用时 125 毫秒
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依据数字水印技术的基本原理,选取适合Symbian OS的数字水印算法开发面向智能手机的数字水印认证技术,它将是数字水印技术的一个针对智能手机应用的发展方向。该文设计了一个基于Symbian平台的智能手机可认证拍照系统,重点说明系统在Symbian平台上实现时的关键技术:图像拍照、数字水印算法移植、活动对象机制等方面问题。经测试表明,该系统可以实现手机拍照、快速嵌入水印、提出水印,并能通过提取的水印达到认证原始图像是否被篡改的目的。 相似文献
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开发面向智能手机的输入法是汉字输入技术的一个发展方向.首先分析了Symbian下的输入法接口以及相关技术,提出了一个客户机/服务器结构的输入法设计模式.然后给出了Symbian下输入法的设计要点,包括客户机端设计、服务器端设计以及服务器和客户机交互设计等内容.最后,简单阐述了码本的设计技术和检索机制. 相似文献
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系统发挥智能手机的便于携带等特点,实现一套Android手机客户端软件和完善的后台服务功能来完成考试练习功能.该系统主要包括后台数据库服务器、WEB服务器、Android前端等部分.客户端Android系统智能手机具有前端处理与计算能力,而且可以通过网络访问服务器,向服务器上传成绩或者下载新试卷.介绍了系统架构的设计与实现,给出了部分设计代码.实践表明系统实现了随时随地的学习,受到了用户的欢迎,达到了预期目标. 相似文献
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周墨颂 《计算机光盘软件与应用》2011,(1)
Symbian OS是一个为手机而设计的搡作系统,它是全球最流行的智能手机操作系统,占有智能手机市场最多的份额,拥有数量众多的开发人员和用户.Symbian OS将Socket通信机制进行封装,提供了在TCP/IP、HTTP、WAP、IrDA、蓝牙、SMS和EMS等协议栈上用于实现智能手机所有通信功能的API.在Symbian OS智能手机平台上,以C++语言设计并实现一个基于Socket套接字的.利用SMTP协议的邮件发送程序.程序以同步的方式利用套接字,最终在实验模拟嚣和诺基亚手机平台上得到了验证,并取得了良好的效果. 相似文献
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对现有的视频监控设备进行了调查和研究,提出一种基于Android平台的嵌入式视频监控系统.该系统主要由基于S3C2440芯片的开发板和Android智能手机两部分组成.目标板用于视频的采集和压缩编码,并将生成MPEG-4视频流发送到Helix Server流媒体服务器.Android智能手机作为监控端的视频监控界面,以3G的方式进行登录,并通过Android智能手机自带的浏览器播放视频数据.通过Android智能手机浏览器观看到的视频达到正常监控的标准. 相似文献
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《计算机应用与软件》2014,(1)
基于Android的开源特性,在系统软件平台之上设计开发视频监控系统。介绍系统的功能需求和Android应用开发过程中的技术要领。利用Eclipse开发工具、Java JDK和Android SDK,设计完成基于Android平台的手机对视频监控系统服务器的访问。该系统把网络视频监控和移动终端相结合,克服了普通网络视频监控对监测客户端地点上的限制。实验结果表明,该设计可以实现基于Android平台的终端设备与远端的实时视频服务器的数据流的传输,也可以从存储服务器上下载视频文件并播放,在实际的应用测试中验证了可行性。 相似文献
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为了扩大单个摄像头的视频监控范围及灵活性, 设计了一种可远程操控的移动视频监控系统. 该系统由四个模块组成, 基于Arduino系统的智能车搭载有摄像头, 接收用户指令, 用于移动视频的采集; 嵌入式Linux系统通过V4L2接口实现对视频数据的实时采集, 一方面将数据通过网络发送至转发服务器, 另一方面将来自用户的控制指令转发至智能车; 服务器则用于转发视频至客户端以及转发用户控制指令至Linux系统; 基于Android的移动端呈现监控视频并提供用户控制界面. 与现有系统相比, 该系统可使用单摄像头实现无死角监控. 相似文献
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Recent advances in multimedia processing technologies, internet‐working technologies, and the World Wide Web phenomenon have resulted in a vast creation and use of digital videos. Due to this reason, an efficient technique to locate and retrieve a desired video from a remote video archive is needed. A trial‐and‐error approach popularly used in current Web search engines is not applicable for searching for a desired video segment since the technique incurs intolerable delays. In this paper, we present the design and implementation of a video browsing system that lets the user view a summary of a selected video and search within the video while being downloaded so that the user can determine the relevance of the video as early as possible. The system is inexpensive and scalable, making it suitable for large‐scale distributed systems such as the Internet. The browsing system consists of two major software components: a video server, and a video browser and player called VideoCenter implemented using Microsoft DirectShow multimedia development kit. The implementation of VideoCenter enables us to assess the ease of use of DirectShow as well as its drawbacks in developing multimedia applications. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
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随着多媒体技术的高速发展,视频采集有了更多的实现方式。介绍了一种基于ARM11处理器和嵌入式Linux的视频采集系统,通过搭建视频服务器,使用USB摄像头进行实时采集,通过无线网卡进行网络传输,在客户端可利用Web浏览器进行视频播放。该系统能独立完成视频的采集与传输工作,经测试表明,系统设计合理,运行稳定,并可扩展于远程监控系统、智能家居等领域。 相似文献
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A practical design of content protection for H.264/AVC compressed videos by selective encryption and fingerprinting 总被引:1,自引:0,他引:1
Digital Rights Management (DRM) of videos is an important issue nowadays. Considering that H.264/AVC videos will be widely used in various applications, we propose a practical design, which combines the methodologies of selective encryption and fingerprinting, for effective DRM of H.264/AVC streaming videos. A selective encryption scheme is first presented to scramble the video content by encrypting a small amount of data in the compressed bit-stream. The scrambled video is H.264-compliant to reduce the complexity of decoder since it can still be played without triggering errors in the decoding process. A fingerprinting scheme is then introduced to provide further protection. We extract a reasonable amount of data from the video and embed the watermark acting as the fingerprint of the video recipient. To acquire the high-quality video for viewing, the user has to decrypt the video obtained from a video server and then combine it with the watermarked data provided from a user information server. The resulting viewable video is thus fingerprinted to deter the user from illegally redistributing the content. Experimental results will demonstrate the feasibility of the proposed approach. 相似文献
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WCEEC--一个基于Web的电子会议系统 总被引:5,自引:0,他引:5
介绍了一个基于Web的电子会议系统WCEEC的设计及其实现,该系统采用了browser/server与多层client/server相结合的结构,可分为实时,异步和临时3种会议工作方式,具有完整的会议管理功能,支持多种会议工具,客户端程序以Java applet的形式实现,用户可通过Web浏览器下载运行。 相似文献
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一种智能视频监控体系结构设计方案 总被引:1,自引:0,他引:1
智能视频监控就是将自动视频分析技术应用到视频监控系统中。本文探讨了智能视频监控的功能作用,设计了一种智能视频监控系统的体系结构方案,并重点阐述了其智能监控服务器模块的内部功能和结构,指出了实现智能监控所需的关键技术。 相似文献
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This paper proposes a new video distribution service: Video-In-Network (VIN). In VIN, videos are continuously circulating
in an optical network where they can be easily retrieved by VIN Nodes. A mathematical model of the VIN system was derived
and used to explore the performance of VIN in terms of the maximum number of concurrent video streams which can be supported
by the system. We then compared VIN with Staggered Multicast. We found that VIN has a number of advantages over Staggered
Multicast. First, VIN is more scalable in terms of the number of streams/channels. Second, the startup latency of VIN is shorter
than that of Staggered Multicast. Third, Staggered Multicast is a near-VOD system and the video clients usually have no specific
channels to the server to request for video. In the VIN system, the video clients can request the VIN Node for particular
videos for multicast or unicast on demand. 相似文献
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以水箱作为实验对象,采用动态矩阵控制的截断误差校正算法来实现对液位的定值控制。将动态矩阵控制算法在MATLAB中用Simulink建立模型,通过网络远程下载到网络化控制器中执行,对水箱液位进行实时控制,同时由监控组态软件远程监控和管理,及实验室的网络视频服务器远程监控现场情况。双容实验控制效果较为理想,在工作点附近可以较快而平稳地达到设定值。 相似文献
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Recent advances in storage technology, coupled with the
dramatic increase in the bandwidth of networks,
now make it possible to provide "video-on-demand" service to
viewers. A video-on-demand server is a
computer system that stores videos in compressed digital form
and provides support for
various portions of compressed video data to
be accessed and transmitted concurrently.
We present a low-cost storage architecture
for a video-on-demand server that relies principally on disks.
The high bandwidths of disks in conjunction with a
clever strategy for striping videos
on them enables
simultaneous
access and transmission of portions of a video,
separated by fixed time intervals.
We also present schemes for implementing
VCR-like functions including fast forward, rewind, and pause,
and extend our schemes to the case in which videos have
different rate requirements. 相似文献