网络视频监控系统的应用和发展

阐述目前国内外网络视频监控系统技术的发展和应用状况．对视频压缩编码和视频存储两方面关键技术进行分析和比较。     

全媒体时代广播电视台全媒体业务的探索与实践

随着全媒体技术的发展和媒体受众的改变,广播电视媒体开始拓展全媒体业务,以安庆市广播电视台门户网站及安庆手机台的建设为例,对全媒体内容汇聚管理、多格式多码流集中转码、多屏融合发布以及移动客户端等系统进行了一些探索与实践,从全媒体平台建设构想、建设目标、总体设计以及功能模块详解等几个方面,介绍了安庆市广播电视台全媒体互动平台的建设方案,为其他广播电视媒体建设全媒体平台、开展全媒体业务提供参考。     

MDVQM: A novel multidimensional no-reference video quality metric for video transcoding

In this paper, we study the impact of quantization, frame dropping and spatial down-sampling on the perceived quality of compressed video streams. Based on the analysis of quality ratings obtained from extensive subjective tests, we propose a no-reference metric (named MDVQM) for video quality estimation in the presence of both spatial and temporal quality impairments. The proposed metric is based on the per-pixel bitrate of the encoded stream and selected spatial and temporal activity measures extracted from the video content. All the values required to compute the proposed video quality metric can be obtained without using the original reference video which makes the metric for instance useful for making transcoding decisions in a wireless video transmission scenario. Different from comparable metrics in the literature, we have also considered the case when both frame rate and frame size are changed simultaneously. The validation results show that the proposed metric provides more accurate estimation of the video quality than the state of the art metrics.     

一种基于 XML的中间转码模型设计与仿真

WAP的广泛应用，使原有 HTML需要转码为WML ，以便移动无线终端浏览信息。设计了一种基于XML的中间转换模型，通过XML作为中间桥梁，实现从 HTML页面转换到WML页面。并实现模型算法设计，选择纯文本文件实例，对页面转换进行仿真测试，记录相关算法运行时间，对模型性能进行分析，仿真实验结果表明本模型转换时具有更高的准确性和效率。     

基于MPEG-21数字项改编的UMA系统

介绍了UMA系统的基本功能以及不同的视频格式和网络状况给UMA系统带来的失配问题.阐述了在UMA系统中引入MPEG-21的第7部分--数字项改编,来实现资源改编引擎以支持转换编码工具和资源改变引擎QoS的实现,从而解决失配问题.     

多样化素材在非编软件中使用的技术探析

为了增强节目的可看性,我们在节目的制作过程中会从引用大量的视音频素材,这些素材的格式是多种多样的,但是可以让大洋D3-cube EDIT非编软件可以识别并且导入的非常少,本文运用多种技术手段实现了多样化素材的综合利用,丰富了节目的制作表现形式。     

全台网环境下的云视频素材转码系统的设计

在研究和分析广电系统对于视频素材转码实际需要的基础上,结合目前分布式计算和云计算技术的发展状况,提出了一种适合于目前广电系统视频素材共享的转码解决方案.系统在全台网的环境下,采用MapReduce的编程框架,以FFmpeg实现视频素材编码格式的转换,根据实际用户提出的转码请求,以视频分段策略实现视频在各个分布式客户端的格式转换,并采用视频格式自适应机制实现视频格式在各个不同的系统中转换和应用,在全台网环境内构建一个高效的、自适应的视频素材格式转换平台,使视频素材在电视台各个部门之间实现有效的共享.     

MPEG-2到MPEG-4转换编码中场-帧编码宏块转换及运动矢量优化算法

本文针对MPEG-2到MPEG-4转换编码中存在的场、帧编码宏块的不兼容问题,提出了场-帧编码宏块的转 换方法,并重点研究了场-帧转换后的运动矢量生成和优化问题,提出了一种基于残差图像DCT交流系数权重的自适应场 -帧运动矢量优化算法,实验表明其性能良好。     

iMobile EE – An Enterprise Mobile Service Platform

iMobile is an enterprise mobile service platform that allows resource-limited mobile devices to communicate with each other and to securely access corporate contents and services. The original iMobile architecture consists of devlets that provide protocol interfaces to different mobile devices and infolets that access and transcode information based on device profiles. iMobile Enterprise Edition (iMobile EE) is a redesign of the original iMobile architecture to address the security, scalability, and availability requirements of a large enterprise such as AT&T. iMobile EE incorporates gateways that interact with corporate authentication services, replicated iMobile servers with backend connections to corporate services, a reliable message queue that connects iMobile gateways and servers, and a comprehensive service profile database that governs operations of the mobile service platform. The iMobile EE architecture was also extended to provide personalized multimedia services, allowing mobile users to remotely control, record, and request video contents. iMobile EE aims to provide a scalable, secure, and modular software platform that makes enterprise services easily accessible to a growing list of mobile devices roaming among various wireless networks.     

视频转码压缩技术的研究

介绍一种基于MPEG-2的变码率到定码率的视频转码压缩系统。采用软件实现，极大地降低了成本。