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手机电视技术及应用探析 总被引:1,自引:0,他引:1
手机电视的业务本质是一种移动数据业务,是利用手机终端为用户提供视频资讯服务。作为多技术、多媒体融合的产物,手机电视正在成为一种独特的新媒体形态,而被广泛关注。本文介绍了手机电视实现方式,分析比较了DVB-H、MediaFLO、TIS-DMB等手机电视主要技术标准和信道、信源编码等技术要求,并结合国内政策条件,国内外手机电视应用情况等分析了手机电视的业务模式和应用环境。 相似文献
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数字电视视频编码技术的研究 总被引:1,自引:0,他引:1
数字电视作为当前电视发展的方向在学术界和工业界引起了广泛的关注,而作为数字电视信息载体中的关键技术,视频编码技术也成为发展的核心。介绍了期望于应用在数字电视领域的视频编码技术的演进,以及H.264这一当前最新标准的技术原理和特点。 相似文献
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随着科学技术的不断进步,互动电视广泛应用于人们的日常生活当中。大体上说来,互动电视技术包含了计算机技术、视频编码解码技术等多个领域,是一门综合性的科学。伴随着电视技术的不断发展,互动电视技术也必然会得到相应的提高,在生活中发挥更加重要的作用。本文将介绍融合网络宽带IP的互动电视技术设计,为今后互动电视技术的深入发展提供一定的理论依据。 相似文献
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T-DMB技术及其应用 总被引:1,自引:0,他引:1
多媒体技术和移动通信技术的飞速发展激发了人们进行视频信息交流的需求。本文针对手机电视三大标准之一的T-DMB标准,介绍了T-DMB系统的历史和基本原理,进而阐述了T-DMB系统MUSICAM 信号源编码、COFDM信道编码调制、单频同步网等关键技术及其在上海的应用。 相似文献
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本文研究了超高清电视国内外发展现状,对超高清电视系统的图像参数进行了分析介绍;在我们追求信息量大和视觉享受更美好的同时带来的问题是数据量的急剧增加,对视频的压缩编码和传输都提出了很高的要求,本文介绍了高效视频编码(HEVC)技术框架,分析了HEVC的关键技术. 相似文献
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随着虚拟现实、增强现实等沉浸式媒体技术的发展,沉浸式视频的表示、存储、传输和显示等各个环节都受到了科研及产业界的广泛关注。沉浸式视频更复杂的视频特性和庞大的数据量,对传统视频编码技术提出了挑战,新的编码技术应运而生。该文从视频自由度(DoF)出发,分别从3DoF和6DoF两个方面介绍沉浸式视频编码技术的最新成果。3DoF视频相关编码技术包括投影模型、运动估计模型和3DoF视频编码标准。6DoF视频相关编码技术包括视频表示形式、虚拟视点合成技术、6DoF视频编码技术及运动图像专家组沉浸式视频(MPEG, MIV)编码标准。最后,对沉浸式视频及其编码技术的发展进行总结和展望。 相似文献
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H.264视频压缩关键技术及其应用前景 总被引:6,自引:0,他引:6
ISO/IEC和ITU-T联合制定的H.264标准,标志着视频压缩技术的最新进展.H.264视频编码新标准采用一系列最新的压缩技术,提高了压缩率.该文重点介绍了视频编码新标准H.264的关键模块,并阐述了它在数字电视、高清晰度电视以及移动通信等方面的应用前景. 相似文献
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T. S. Rzeszewski 《International Journal of Communication Systems》1988,1(1):33-40
Video coding for Broadband Integrated Services Digital Network (BISDN) is analysed, and coding techniques that use sub-Nyquist sampling are proposed. Specifically, recommendations are given for digital video coding for EQTV distribution in the area of BISDN at a payload rate of approximately 135 Mb/s. The contribution signal that is used in video production will either be the CCIR Recommendation 601 signal or a minor modification of it to maximize horizontal resolution. Also, the scanning parameters will be the same as NTSC so that the same monitor can be used to display either EQTV or NTSC TV. A compatible vertical improvement can be added initially, or in the future, that will provide additional vertical resolution beyond the capability of the present NTSC TV, or the capabilities of Recommendation 601. Finally, several coding techniques for video distribution are configured to maximize horizontal resolution given the above constraints. Two of these video coding techniques allow extra bandwidth by using sub-Nyquist sampling techniques together with comb filtering. This EQTV system will produce a horizontal resolution that is close to values normally used for HDTV. 相似文献
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Euee S.Jang 《中兴通讯技术(英文版)》2012,(2):19-24
Recent advances in reconfigurable computing have led to new ways of implementing complex algorithms while maintaining reasonable throughput.Video codecs are becoming more complex in order to provide efficient compression for video with ever-increasing resolution.This problem is compounded by the fact that spectra of video decoding devices has become wider in the move from traditional TV to cable and satellite TV,IPTV,mobile TV,and Internet media.MPEG is tackling this problem with a reconfigurable video coding(RVC) framework and is standardizing a modular definition of tools and connections.MPEG’s work started with video coding and has recently extended to graphics data coding.RVC will be supported by non-MPEG standards such as the Chinese audio-video standard(AVS).This article gives a brief background to the reconfigurable codec framework.The key to this framework is reconfigurability and reducing granularity to find commonality between different standards. 相似文献
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《Multimedia, IEEE》2007,14(2):78-82
Sports content continues to generate a global appeal that transcends national, cultural, religious, and gender boundaries. Historically, TV technology's success has been intertwined with the development of televised sports. In the famous words of pioneering TV sports director Harry Coyle, "television got off the ground because of sports." Sports showcases offer a splendid platform to promote new media technologies. During the 2006 FIFA (Federation Internationale de Football Association) World Cup tournament in Germany, major mobile companies launched a plethora of mobile TV services with such offerings as video streaming, text-based services, ring-tone downloads, and mobile blogging proposes a new way of enhancing the commercial value of sports video Webcasts. Clearly, the amount of advertising exposures must be managed to avoid viewers' perceiving them as unnecessary clutter in the video. As with legacy video broadcasting systems staffed by human operators, this check can be easily managed manually. Automatic machine detection techniques, however, can further facilitate advertising content insertion 相似文献
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Feedback-based error control for mobile video transmission 总被引:25,自引:0,他引:25
Girod B. Farber N. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1999,87(10):1707-1723
We review feedback-based low bit-rate video coding techniques for robust transmission in mobile multimedia networks. For error control on the source coding level, each decoder has to make provisions for error detection, resynchronization, and error concealment, and we review techniques suitable for that purpose. Further, techniques are discussed for intelligent processing of acknowledgment information by the coding control to adapt the source coder to the channel. We review and compare error tracking, error confinement, and reference picture selection techniques for channel-adaptive source coding. For comparison of these techniques, a system for transmitting low bit-rate video over a wireless channel is presented and the performance is evaluated for a range of transmission conditions. We also show how feedback-based source coding can be employed in conjunction with precompressed video stored on a media server. The techniques discussed are applicable to a wide variety of interframe video schemes, including various video coding standards. Several of the techniques have been incorporated into the H.263 video compression standard, and this standard is used as an example throughout 相似文献
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中国移动多媒体广播技术分析 总被引:2,自引:0,他引:2
随着广播电视的数字化及与移动技术的相互融合,中国的手机电视业务发展迅速,以手机电视为代表的移动多媒体广播(CMMB)在奥运会期间发挥了重大作用,成为现在的热点话题。对CMMB手机电视业务的网络框架、标准、各种技术:信道传输技术、信源编码和解码、时间分片技术等方面进行了阐述,最后给出了CMMB的发展前景和优势,在不久的将来,CMMB移动多媒体技术必将成为中国主流的技术。 相似文献
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Sung-Hoon Hong Seong-Dae Kim 《Broadcasting, IEEE Transactions on》1998,44(2):153-164
In digital broadcasting services such as digital satellite TV, cable TV, and digital terrestrial TV, several video programs are compressed by MPEG-2 and then simultaneously transmitted over a conventional CBR (constant bit rate) broadcasting channel. In this environment, the picture quality of the aggregated video programs should be kept as equal as possible to provide fair video services for all the viewers. We propose a joint video coding scheme for ensuring that the picture quality of all the programs are nearly the same. This objective is achieved by simultaneously controlling the video encoders to generate the VBR (variable bit rate) compressed video streams. This paper contributes in two ways. First, we propose a rate-distortion estimation method for MPEG-2 video, which enables us to predict the amount of bits and the distortion generated from an encoded picture at a given quantization step size and vice versa. The most attractive features of the proposed estimation method are its accuracy and a computational complexity low enough to be applied to real-time video coding applications. Second, this paper presents an efficient and accurate joint video coding scheme using the rate-distortion estimation results. The experimental results show that our coding scheme gives a higher and more stable picture quality and a more efficient channel utilization than an independent coding scheme that encodes each program independently 相似文献