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设计了一种节能型视频监控终端.该终端以TMS320DM642芯片为核心,在摄像头、图像解码芯片TVP5150、红外传感器等外围芯片的协助下,能有效监控区域人员出入情况,并仅在有人员进入监控区域时才开始视频图像的采集、处理、传输等,既达到了监控目的,又节约了部分电能. 相似文献
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李敏 《单片机与嵌入式系统应用》2016,(2):48-50
对目前可视对讲系统的视频采集技术进行了研究,探讨视频解码芯片应用于可视对讲系统的视频采集的可行性.以TVP5150为视频解码芯片,i.MX27为系统控制核心,利用Linux2.6内核,通过I2 C总线初始化TVP5150,使用Linux系统中视频设备的内核驱动构架 V4 L2,实现了视频采集功能. 相似文献
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针对现有煤矿井下视频传输系统存在视频清晰度低、传输速率不稳定、兼容性差等问题,设计了一种矿用实时视频传输系统。该系统采用960 nm红外激光作为辅助光源,利用MCCD图像传感器采集视频信号,提高了低光照强度或黑暗环境下视频清晰度;通过视频解码模块TVP5150将采集的PAL制式模拟视频信号转换为YUV数字信号,数字信号经多格式编码器进行H.264压缩编码,并在此基础上添加UDP报文头进行RTP封装,提高了视频数据传输的时效性;通过Live555流媒体服务器进行数据流化,使用ONVIF标准封装RTSP视频流,通过Socket网络编程实现实时视频流数据网络传输,提高了系统兼容性和传输速率稳定性。测试结果表明,该系统视频传输速率为2.190 Mbit/s,丢包率约为1.256%,达到实时视频传输要求。 相似文献
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基于达芬奇技术的视频监控系统设计 总被引:1,自引:0,他引:1
结合实际应用及多媒体技术的发展趋势,设计了一套以TMS320DM6467为核心的硬件平台,并借助嵌入式Linux为软件核心的多通道视频监控系统。系统采用TVP5158实现对4通道模拟视频信号采集,通过达芬奇技术实现基于H.264的4通道实时视频压缩,利用UDP协议将采集端的视频数据通过局域网发送至监控中心,用户可通过监控中心控制软件对相应区域进行实时监控。系统在单芯片上实现多通道视频监控系统,具有低成本、高性能的特点,可应用于交通、厂区防盗、智能家居监控、视频会议等领域。 相似文献
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安防监控是未来智慧城市的重要发展方向之一,基于Android的视频监控使安防应用更为便捷、智能。本系统采用高性能的ARM Cortex-A8处理器,在Android系统之上构建了一个安防视频监控系统。采用Android底层的Linux内核驱动实现视频数据的采集,并通过移植x264和JRTPLIB库实现了视频数据的H.264编码和RTP协议传输,保证了视频监控具有较好的实时性和可靠性。 相似文献
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Video in digital format is now commonplace and widespread in both professional use, and in domestic consumer products from camcorders to mobile phones. Video content is growing in volume and while we can capture, compress, store, transmit and display video with great facility, editing videos and manipulating them based on their content is still a non-trivial activity. In this paper, we give a brief review of the state of the art of video analysis, indexing and retrieval and we point to research directions which we think are promising and could make searching and browsing of video archives based on video content, as easy as searching and browsing (text) web pages. We conclude the paper with a list of grand challenges for researchers working in the area. 相似文献
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吴勇 《计算机应用与软件》2015,32(1)
视频数据具有获取便捷、表达直观、信息丰富的特性,使其成为GIS领域一种重要的数据源。同时,视频数据与GIS系统的集成应用已逐渐成为当前国际上的一个研究热点和新兴产业生长点。从数据采集、数据解析与数据组织检索的角度对视频空间化方法进行系统归纳与总结,详细介绍视频数据与空间信息采用字符叠加、音频调制、外部关联以及嵌入视频容器四种集成方式、原理以及特点;并阐述单张、双(多)张视频三维建模、量测原理与方法,尤其对其核心问题相机标定进行深入剖析;同时总结提炼视频/照片的基于位置检索的组织策略。最后,介绍视频GIS在相关领域的典型应用,并对其发展做了展望。 相似文献
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计算机与通讯技术的发展与融合,为人们带来了一种全新的通讯方式-可视通讯。这种全新的通讯方式将会极大地改变人们未来的生活与工作方式。本文将结合作者研究H.324可视电话的实际工作,探讨其中的一些关键技术。并在文章的最后,从系统优化的角度,给出作者关于H.324视频会议系统在设计、实现与验证阶段对这些关键处理的一些看法与经验。 相似文献
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滕秀荣 《数字社区&智能家居》2006,(9):167-168
文章通过对多媒体影视制作中所涉及到的技术的探讨,结合实际制作经验,简要阐述了在多媒体视频处理中,所涉及到的基础知识、硬件设备及各种连接方式,为视频的处理提供一个良好的操作平台,确保作品质量,再配备合适的软件加以处理将带给观赏者更完美、更赏心悦目的画面. 相似文献
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Jinguk Jeong 《Multimedia Tools and Applications》2008,39(2):149-167
This paper proposes a new play segmentation algorithm using a local adaptive model for each sports game, in which the play start shots (PSS) that represent the start of each play segment are detected by comparing all of keyframes with the PSS model. The PSS model is calculated on the fly using generic clustering algorithm and a repetitive characteristic of the PSS. The end of each play segment (the play end shot (PES)) is determined by detecting close up shots using the field color extracted from the play start shots since the camera will focus on the players or the audience with close up view. Experimental results with 28 baseball videos
show that good performance can be obtained with the proposed algorithm compared to other algorithms.
相似文献
Jinguk JeongEmail: |
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Automatic parsing and indexing of news video 总被引:9,自引:0,他引:9
Automatic construction of content-based indices for video source material requires general semantic interpretation of both images and their accompanying sounds; but such a broadly-based semantic analysis is beyond the capabilities of the current technologies of machine vision and audio signal analysis. However, if one can assume a limited and well-demarcated body of domain knowledge for describing the content of a body of video, then it becomes easier to interpret a video source in terms of that domain knowledge. This paper presents our work on using domain knowledge to parse news video programs and to index them on the basis of their visual content. Models based on both the spatial structure of image frames and the temporal structure of the entire program have been developed for news videos, along with algorithms that apply these models by locating and identifying instances of their elements. Experimental results are also discussed in detail to evaluate both the models and the algorithms that use them. Finally, proposals for future work are summarized. 相似文献
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刘岸杰 《自动化与仪器仪表》2012,(5):86-88
视频信号在处理之前为改善信号质量需要必要的预处理过程,主要包括视频嵌位、视频滤波、视频放大及驱动等.本文首先介绍视频预处理的原理及必要性;其次介绍一款专门为改善视频信号的质量设计的芯片MAX7450,该器件包括内建视频输入嵌位器、自动增益控制器、同步丢失检测器、带外噪声滤波器及可供用户选择增益的缓冲器等;最后介绍该芯片在视频预处理中的应用. 相似文献
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W. A. C. Fernando 《Multimedia Tools and Applications》2006,28(3):301-320
This paper addresses an important area in video processing, namely compressed domain processing. For video indexing, video
scene transition detection is an essential step to segment the video. Current techniques for scene change detection tend to
suffer from a major limitation as most of them cannot identify scene transitions in the compressed domain. Since most video
is expected to be stored in the compressed domain, scene transition detection in this domain is highly desirable. In this
paper an algorithm for video scene change detection is proposed to overcome this limitation. In this scheme, properties of
the B-frames are used as it is capable of measuring the correlation between two adjacent reference frames. The results show
that this scheme performs better than schemes based on P-frames. Proposed scheme can be directly applied with compressed data
with minimum decompression and hence it is computationally efficient and makes real time implementations possible. Results
show that video scene transitions can be identified satisfactorily with the proposed scheme. 相似文献