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Continuous media playback and jitter control 连续媒体播放和抖动控制
S. Jha, M. Fry
The purpose of this paper is to examine problems associated with display (playback) of live continuous media under varying conditions for an internetwork of workstations running a general purpose operating system such as Unix. Under the assumption that the network cannot guarantee the required bounds on delay and jitter, there is a need to accommodate the delay jitter in the end systems. Various methods of jitter smoothing at the end systems and their suitability to audio as well as video transmission are discussed. An experimental testbed used to investigate these problems is described. Some initial empirical results obtained using this testbed are also presented.
本文的目的是研究运行通用操作系统(如Unix)的工作站网络在不同条件下与实时连续媒体的显示(播放)相关的问题。在网络不能保证时延和抖动的边界的前提下,需要在终端系统中适应时延抖动。讨论了终端系统的各种抖动平滑方法及其在音频和视频传输中的适用性。描述了一个用于研究这些问题的实验测试平台。文中还介绍了利用该试验台获得的一些初步经验结果。
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引用次数: 11
Content-based drama editing based on inter-media synchronization 基于跨媒体同步的基于内容的话剧编辑
Y. Yaginuma, M. Sakauchi
Automatic image recognition is usually difficult. However, drama is composed of not only image but also sound and script. Therefore, higher level recognition of drama which cannot be achieved by the image analysis will be realized by integrating image analysis, sound analysis and document analysis. In this paper, focusing on the semantic descriptions in the script, content-based drama editing based on inter-media synchronization is proposed. In the proposed method, inter-media synchronization between image, sound and script is carried out using DP matching. Then, the script is edited using an ordinary text editor. Finally, the editing of drama is carried out by selecting and aligning the image and sound based on the edited script. Therefore, the proposed method can realize effective and semantic-based video editing by handling smaller and more abstracted data. The experimental results reveal the effectiveness of the proposed method.
自动图像识别通常是困难的。然而,戏剧不仅由图像组成,还由声音和剧本组成。因此,将图像分析、声音分析和文献分析相结合,可以实现图像分析无法达到的对戏剧的更高层次的识别。本文针对剧本中的语义描述,提出了基于媒体间同步的基于内容的戏剧编辑。在该方法中,使用DP匹配实现图像、声音和脚本之间的媒体间同步。然后,使用普通文本编辑器编辑脚本。最后,根据编辑好的剧本,对画面和声音进行选择和对齐,进行戏剧的剪辑。因此,该方法可以通过处理更小、更抽象的数据来实现有效的基于语义的视频编辑。实验结果表明了该方法的有效性。
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引用次数: 10
SEP: a space efficient pipelining technique for managing disk buffers in multimedia servers SEP:在多媒体服务器中管理磁盘缓冲区的一种空间高效的流水线技术
J. Wang, K. Hua, H. Young
We present techniques for managing disks as a buffer for the tertiary storage of multimedia servers. A unified disk space is used to not only cache frequently referenced objects, but also to provide staging buffers for playing back objects. A new staging technique and three buffer replacement policies are investigated. The simulation results indicate that the staging method is very efficient, and each of the replacement policies offers significant additional improvement. Some of the performance issues are also analyzed analytically. The mathematical model provides guidelines for good multimedia systems design using the proposed techniques.
我们提出了管理磁盘作为多媒体服务器三级存储缓冲区的技术。统一的磁盘空间不仅用于缓存频繁引用的对象,而且还用于为回放对象提供暂存缓冲区。研究了一种新的分级技术和三种缓冲区替换策略。仿真结果表明,分期方法是非常有效的,并且每个替换策略都有显著的额外改进。对一些性能问题也进行了分析。数学模型为使用所提出的技术进行良好的多媒体系统设计提供了指导。
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引用次数: 12
Intelligent browsing for multimedia applications 多媒体应用的智能浏览
C. Drummond, D. Ionescu, R. Holte, N. Georganas, E. Petriu
Describes a technique which we term "intelligent browsing"; the software built upon this technique assists the users in their search through a multimedia database. Searching for an item of interest in a large multimedia database is a complex task, even for users who have knowledge about it. An active (intelligent) browser suggests to the user items it estimates to be close to the target of the search. The intelligent part of the active browser consists of a learning module, whose object of study is the profile of the users' search actions. After a target is detected, the intelligent browser brings the item or items of interest on to the screen in a dedicated window, and controls the synchronization of the audio, video or written components of the item. If confirmed by the user, the dedicated window is transformed into a series of windows allocated to the desired item. The novel aspect of intelligent browsing is that it is entirely unobtrusive: it infers its similarity measure from the user's normal browsing actions, without any special input. Use of the browser on a multimedia application is illustrated in this paper.
描述了一种我们称之为“智能浏览”的技术;基于这种技术的软件帮助用户通过多媒体数据库进行搜索。在大型多媒体数据库中搜索感兴趣的项目是一项复杂的任务,即使对具有相关知识的用户也是如此。活动(智能)浏览器向用户建议它估计接近搜索目标的项目。主动浏览器的智能部分包括一个学习模块,其研究对象是用户搜索行为的概要。在检测到目标后,智能浏览器将感兴趣的项目或项目带到专用窗口的屏幕上,并控制项目的音频,视频或书面组件的同步。如果用户确认,专用窗口将转换为分配给所需项目的一系列窗口。智能浏览的新颖之处在于它完全不引人注目:它从用户的正常浏览行为中推断出相似性度量,而无需任何特殊输入。本文阐述了浏览器在多媒体应用程序中的使用。
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引用次数: 7
On optimal batching policies for video-on-demand storage servers 视频点播存储服务器的最优批处理策略
C. Aggarwal, J. Wolf, Philip S. Yu
In a video-on-demand environment, batching of video requests is often used to reduce I/O demand and improve throughput. Since viewers may defect if they experience long waits, a good video scheduling policy needs to consider not only the batch size but also the viewer defection probabilities and wait times. Two conventional scheduling policies for batching are first-come-first-served (FCFS) and maximum queue length (MOL). Neither of these policies lead to entirely satisfactory results. MQL tends to be too aggressive in scheduling popular videos by only considering the queue length to maximize batch size, while FCFS has the opposite effect. We introduce the notion of factored queue length and propose a batching policy that schedules the video with the maximum factored queue length. We refer to this as the MFQ policy. The factored queue length is obtained by weighting each video queue length with a factor which is biased against the more popular videos. An optimization problem is formulated to solve the best weighting factors for the various videos. A simulation is developed to compare the proposed MFQ policy with FCFS and MQL. Our study shows that MFQ yields excellent empirical results in terms of standard performance measures such as average latency time, defection rates and fairness.
在视频点播环境中,视频请求的批处理通常用于减少I/O需求和提高吞吐量。由于观看者在长时间等待后可能会叛变,因此一个好的视频调度策略不仅需要考虑批量大小,还需要考虑观看者叛变概率和等待时间。两个传统的批处理调度策略是先到先服务(FCFS)和最大队列长度(MOL)。这两种政策的结果都不完全令人满意。MQL在调度热门视频时往往过于激进,只考虑队列长度以最大化批处理大小,而FCFS则具有相反的效果。我们引入了因子队列长度的概念,并提出了一种以最大因子队列长度调度视频的批处理策略。我们称之为MFQ政策。因子队列长度是通过对每个视频队列长度进行加权得到的,该因子偏向于更受欢迎的视频。提出了一个优化问题来求解各种视频的最佳加权因子。通过仿真,将所提出的MFQ策略与FCFS和MQL策略进行了比较。我们的研究表明,MFQ在标准性能指标(如平均延迟时间、失误率和公平性)方面产生了出色的实证结果。
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引用次数: 280
Video/text linkage system assisted by a concept dictionary and image recognition 视频/文本联动系统,辅以概念词典和图像识别
Mitsukazu Washisaka, T. Takada, S. Aoyagi, R. Onai
This paper describes a system for two-way linkage between video and its transcribed text that supports observational data analysis. One distinct feature of the system is that a specific area in the video image is linked to the text. The luminance (Y) signal of the video image is used to assist in linkage establishment from video to text. Another feature is that it is possible to extract concepts of the search term and to compare these with the text data on a conceptual level.
本文描述了一个支持观测数据分析的视频及其转录文本之间的双向链接系统。该系统的一个显著特点是视频图像中的特定区域链接到文本。利用视频图像的亮度(Y)信号辅助建立视频到文本的联动。另一个特性是可以提取搜索词的概念,并在概念级别上将这些概念与文本数据进行比较。
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引用次数: 2
Intra- and inter-stream synchronisation for stored multimedia streams 存储多媒体流的流内和流间同步
E. Biersack, C. Bernhardt, Werner Geyer
Multimedia streams such as audio and video impose tight temporal constraints due to their continuous nature. Often, different multimedia streams must be presented in a synchronized way. We introduce a scheme for the continuous and synchronous delivery of distributed stored multimedia streams across a communications network. We propose a protocol for the synchronized playback, compute the buffer requirement, and describe the experimental results of our implementation. The scheme is very general and does not require bounded jitter or synchronized clocks and is able to cope with clock drifts and server drop outs.
多媒体流(如音频和视频)由于其连续性而施加了严格的时间限制。通常,不同的多媒体流必须以同步的方式呈现。介绍了一种跨通信网络连续同步传输分布式存储多媒体流的方案。我们提出了一种同步回放协议,计算了缓存需求,并描述了我们实现的实验结果。该方案非常通用,不需要有界抖动或同步时钟,并且能够应对时钟漂移和服务器退出。
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引用次数: 35
Performance issues in CD-ROM-based storage systems for multimedia 多媒体用cd - rom存储系统的性能问题
Vijnan Shastri, P. Rangan, V. Rajaraman, A. Pittet, Srihari Sampath Kumar
CD-ROMs have proliferated as a distribution media for desktop machines for a large variety of multimedia applications. We look at issues related to the single-user desktop environment. Since these multimedia applications are highly interactive in nature, we take a pragmatic approach, and have made a detailed study of the multimedia application behavior in terms of the I/O request patterns generated to the CD-ROM subsystem by tracing these patterns. We discuss prefetch buffer design and seek time characteristics in the context of the analysis of these traces. We show that it is best to place multimedia streams near the center of the CD-ROM. We present the parameters of an adaptive main-memory hosted cache that receives caching hints from the application to reduce the latency when the user moves from one node of the hypergraph to another. We show that short-throw seeks of distance 100 are the most important. We look at the use of CD-ROMs in a video on demand server (VoD) and discuss the problem of scheduling multiple request streams and buffer management in this scenario. We adapt C-SCAN (Circular SCAN) algorithm to suit the CD-ROM drive characteristics and prove that it is optimal in terms of buffer size management. We provide computationally inexpensive relations by which this algorithm can be implemented. We then propose a 'constant-full-load' admission control algorithm which admits new request streams from a pool of dummy requests without disrupting the continuity of playback of the previous request streams. The algorithm also supports operations such as fast forward and replay.
cd - rom作为桌面机器的一种分发媒介,用于各种各样的多媒体应用。我们将研究与单用户桌面环境相关的问题。由于这些多媒体应用程序本质上是高度交互的,因此我们采取了一种实用的方法,并通过跟踪这些模式,从生成到CD-ROM子系统的I/O请求模式的角度详细研究了多媒体应用程序的行为。我们讨论了预取缓冲器的设计,并在分析这些轨迹的背景下寻求时间特征。我们表明最好将多媒体流放在靠近CD-ROM中心的位置。我们给出了自适应主存托管缓存的参数,该缓存接收来自应用程序的缓存提示,以减少用户从超图的一个节点移动到另一个节点时的延迟。结果表明,100米的短距离投掷是最重要的。我们将查看视频点播服务器(VoD)中cd - rom的使用情况,并讨论在此场景中调度多个请求流和缓冲区管理的问题。我们采用C-SCAN (Circular SCAN)算法来适应CD-ROM驱动器的特性,并证明了它在缓冲区大小管理方面是最优的。我们提供了计算成本低廉的关系,通过这种关系可以实现该算法。然后,我们提出了一种“恒定满负荷”接纳控制算法,该算法从虚拟请求池中接收新的请求流,而不会中断先前请求流的播放连续性。该算法还支持快进和回放等操作。
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引用次数: 3
Forming square-styled brush-written Kanji through calligraphic skill knowledge 通过书法技能知识形成方笔汉字
T. Yamasaki, T. Hattori
We propose a computer formation of brush-written Kanji characters for a brush writing training system using calligraphic knowledge. The style of brush handwriting depends mainly on the way of using a writing brush. Brush writing skills include the direction of the brush at the beginning, curvature and turning the brush, and the brush-up at the termination point in a stroke. We revise the calligraphic knowledge base according to the above mentioned brush writing skills. For simulating real brush movement, we represent the brush contact form that is the brush shape on the writing plane as a brush-touch. The system can control the size and direction of this brush-touch during the brush simulation. The system simulates the real brush writing to move the brush-touch along the skeleton letter shape in the standard database. We can get the brush written Kanji from the locus of the brush-touch movement. This system is also useful for students learning how to write Japanese letters beautifully with a brush.
我们提出了一种利用书法知识进行毛笔书写训练系统的汉字计算机生成方法。毛笔书写的风格主要取决于毛笔的使用方式。笔法写作技巧包括笔头的方向,笔头的弯曲和转动,笔画中终点的刷动。我们根据上述的毛笔写法来修改书法知识库。为了模拟真实的笔刷运动,我们将笔刷接触形式(即书写平面上的笔刷形状)表示为笔触形式。在笔刷模拟过程中,该系统可以控制笔刷触碰的大小和方向。该系统模拟真实的毛笔书写,使笔触沿着标准数据库中的骨架字母形状移动。我们可以从笔触运动的轨迹得到毛笔书写的汉字。这个系统对学生学习如何用毛笔写漂亮的日语字母也很有用。
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引用次数: 5
Multimedia synchronization system for MPEG video based on quality of pictures 基于图像质量的MPEG视频多媒体同步系统
A. Ichikawa, K. Yamaoka, Toshiyuki Yoshida, Y. Sakai
Proposes a media synchronization method for MPEG video stored in distributed databases in a computer network. The proposed method takes account not only of the video frame synchronization but also of the played-back frame sequence quality. First, we propose a quality measure for moving pictures based on the smoothness of motion, which makes use of motion vectors between frames. Then a synchronization method for MPEG video, based on such a quality measure, is proposed, and its performance is evaluated by a computer simulation, by comparing it with other media synchronization methods for MPEG video.
针对计算机网络中存储在分布式数据库中的MPEG视频,提出了一种媒体同步方法。该方法不仅考虑了视频帧的同步,而且还考虑了播放帧序列的质量。首先,我们提出了一种基于运动平滑度的运动图像质量度量方法,该方法利用帧间的运动矢量。在此基础上提出了一种MPEG视频的同步方法,并通过计算机仿真对其性能进行了评价,并与其他MPEG视频同步方法进行了比较。
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引用次数: 4
期刊
Proceedings of the Third IEEE International Conference on Multimedia Computing and Systems
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