基于Multi-Agent的多媒体个性化检索框架的设计

针对目前Internet多媒体信息检索的不足,分析了Multi-Agent技术在网络多媒体信息检索方面的应用现状。充分考虑到信息检索过程中用户的个性化特点,提出了一个基于Multi-Agent的智能化、个性化、高效协同的多媒体检索系统框架模型。     

支持基于内容检索的多媒体特征模型

信息系统的多媒体化给检索带来了新的挑战。本文从分析基于内容的多媒体信息检索的特点出发,研究并提出了一个多媒体信息特征模型。最后,结合基于特征模型的多媒体信息检索系统总体框架,讨论特征获取、特征管理以及特征学习等相关问题。     

基于WWW的多媒体信息检索

WWW的资源作为Internet网上的资源主体，对它进行基于内容的信息检索已是必须的。但目前的信息组织和管理方式，对它进行基于内容的检索还存在一定困难。本文提出了基于WWW的多媒体信息检索的基本框架，研究了通过该框架进行多媒体信息查询和检索的方法。     

多媒体数据的聚簇开采

Internet的普及使多媒体信息的信息量急剧增大,因而,多媒体数据开采逐渐引起人们的关注。文章基于多媒体数据的特点,结合多媒体信息检索技术和数据开采方法,提出了多媒体数据开采系统的基本框架,并给出多媒体数据上的一种聚簇开采算法MDC。     

基于SQL Server 2008的小型信息检索系统框架的设计与实现

利用SQL Server 2008设计并实现了一个信息检索系统框架,可满足小型企业信息检索的需求。     

多媒体信息检索研究与展望*

对近几年在多媒体信息检索领域的研究成果进行分析,总结了多媒体信息检索的研究现状,指出了该研究领域的发展方向,最后提出了多媒体信息检索技术研究面临的挑战.     

多媒体信息检索服务及其构成

多媒体和超媒体通信系统是目前通信界乃至计算机界研究的热点,它可分为两大类:一类是实时通信系统(人与人通信系统),另一类是存储检索系统(人与机通信系统),本专题主要针对后者。 本专题就以下几个方面:多媒体和超媒体信息检索服务的基本构成;多媒体和超媒体信息检索服务的国际标准和工业标准;多媒体和超媒体信息检索服务中的信息交换;多媒体和超媒体信息检索服务中的硬软件技术;多媒体和超媒体信息检索服务中的网络拓扑结构和体系结构等若干关键技术问题进行了较为系统的阐述,最后,还给出了一个应用实例:多媒体可视图文系统。 多媒体和超媒体通信系统的研究,目前已经取得了一些成果;然而就多媒体和超媒体信息检索系统来说,还有不少新课题有待进一步深入研究。诸如:为操作管理MHI对象而要确定的新的可编程应用接口(API)、在检索系统中MHI的实时交换、AVI应用中的Script表示等。     

分布式超媒体信息检索原型系统DHIRS的设计

超文本技术多媒体信息检索问题的解决提供了一条新的途径，此文介绍了一个面向信息检索应用的分布式超媒体原型系统ＤＨＩＲＳ的体系结构模型和数据模型的设计，并给出系统的功能构成。     

基于内容的多媒体融合分析与检索

多媒体是文本、图像、视频、音频等多模态信息的综合体,每一模态都表示了丰富的语义信息,只有多媒体的融合才能表示多媒体的完整语义信息.本文介绍了多媒体融合分析与检索方法,论述了关键技术.为了提高多媒体信息检索的性能,应结合多种信息检索技术.     

基于MPEG-7的多媒体信息检索研究

研究了MPEG-7的核心内容和多媒体信息检索的主要技术,并对应用MPEG-7进行多媒体信息检索作了一定的探讨.     

Learning similarity matching in multimedia content-based retrieval

Many multimedia content-based retrieval systems allow query formulation with the user setting the relative importance of features (e.g., color, texture, shape, etc.) to mimic the user's perception of similarity. However, the systems do not modify their similarity matching functions, which are defined during the system development. We present a neural network-based learning algorithm for adapting the similarity matching function toward the user's query preference based on his/her relevance feedback. The relevance feedback is given as ranking errors (misranks) between the retrieved and desired lists of multimedia objects. The algorithm is demonstrated for facial image retrieval using the NIST Mugshot Identification Database with encouraging results     

基于内容的视频检索方法的研究

随着计算机技术、多媒体技术的发展和信息需求的不断增长,计算机所能处理的信息媒体范围迅速扩大,基于内容的视频检索(CBVRContent-basedVideoRetrieval)是一个重要的研究领域。针对传统的关键帧检测算法,提出了优化的关键帧检测方法,通过实验数据的比较证明优化方法取得了较好的检索效果。     

A survey on content-based retrieval for multimedia databases

Conventional database systems are designed for managing textual and numerical data, and retrieving such data is often based on simple comparisons of text/numerical values. However, this simple method of retrieval is no longer adequate for multimedia data, since the digitized representation of images, video, or data itself does not convey the reality of these media items. In addition, composite data consisting of heterogeneous types of data also associates with the semantic content acquired by a user's recognition. Therefore, content-based retrieval for multimedia data is realized taking such intrinsic features of multimedia data into account. Implementation of the content-based retrieval facility is not based on a single fundamental, but is closely related to an underlying data model, a priori knowledge of the area of interest, and the scheme for representing queries. This paper surveys recent studies on content-based retrieval for multimedia databases from the point of view of three fundamental issues. Throughout the discussion, we assume databases that manage only nontextual/numerical data, such as image or video, are also in the category of multimedia databases     

Information retrieval and hypertext: competing technologies or complementary access methods

Abstract. Information retrieval typically involves accessing textual information from a database in response to a user's vague information need. Hypertext or hypermedia, on the other hand, involves a user browsing through a database of textual or multimedia information in response to a variety of types of information need. Thus information retrieval can be said to have a searching metaphor while hypertext has a browsing analogy. Initially, these two technologies for information access appear to be very different, almost competitive in nature. In this paper information retrieval systems are briefly reviewed and hypertext systems are also examined. These two techniques for accessing information have been integrated into a prototype system which is described. The system dynamically generates guided tours in response to a user's query and the tour guides the user through the hypertext. Some experiments reporting on the effectiveness of this as an information access strategy are given.     

Fuzzy logic techniques in multimedia database querying: apreliminary investigation of the potentials

Fuzzy logic is known for providing a convenient tool for interfacing linguistic categories with numerical data and for expressing user's preference in a gradual and qualitative way. Fuzzy set methods have been already applied to the representation of flexible queries and to the modeling of uncertain pieces of information in databases systems, as well as in information retrieval. This methodology seems to be even more promising in multimedia databases which have a complex structure and from which documents have to be retrieved and selected not only from their contents, but also from “the idea” the user has of their appearance, through queries specified in terms of user's criteria. This paper provides a preliminary investigation of the potential applications of fuzzy logic in multimedia databases. The problem of comparing semistructured documents is first discussed. Querying issues are then more particularly emphasized. We distinguish two types of request, namely, those which can be handled within some extended version of an SQL-like language and those for which one has to elicit user's preference through examples     

VoD系统的数据预取及缓冲区动态分配策略

给出了一种基于用户数据消费率的动态数据预取和缓冲区分配策略，并通过构建数据读取函数Ｄａｔａｒｅｎｄ（），实现数据的读取和标准ＶＣＲ控制功能。     

A structure-based approach for multimedia information filtering

While multimedia documents are sequentially presented to users, an information filtering (IF) system is useful to achieve a good retrieval performance in terms of both quality and efficiency. Conventional approaches for designing an IF system are based on the user's evaluation on information relevance degree (IRD), but ignore other attributes in system design such as relative importance of the data in a collection of multimedia documents. In this paper, we aim at developing a framework of designing structure-based multimedia IF systems, which incorporates the characteristics of the importance and relevance of multimedia documents. A method of calculating the values of relative importance degree of multimedia documents is proposed. Furthermore, these values are combined into the IRD of multimedia documents to improve the representation of user profiles. An illustrative example is given to demonstrate the proposed techniques.     

一个基于对象的图像检索系统:Basestar

图像检索是近年为适应国际互连网以及图像数据库高速发展而出现的一门新技术。该文建立了一个基于对象的图像检索系统-Basestar。该系统针对传统图像检索方法偏重图像整体特征,忽略用户对图像感知等缺点,采用用户参与方式,自动准确分割对象,并在此基础上利用对象颜色和形状特征对图像实现检索。实验结果表明该系统取得了良好的检索效果。     

压缩域中叠化镜头的快速检测算法

随着网络和多媒体技术的不断发展，基于内容的多媒体信息检索技术变得越来越重要．同成熟的文本检索技术相比，视频检索还处在研究和探索阶段．视频检索的一个有效方法是将无结构的视频节目进行镜头分割，根据每个镜头的关键帧对视频建立索引．因此，镜头分割是基于内容的视频检索的基本步骤，在各种类型的镜头检测算法中，叠化镜头是很难检测的．根据叠化(dissolve)镜头内部预测帧预测误差能量和运动矢量分布特点，提出一种在压缩域中分割叠化镜头的新算法．与公开发表的同类算法相比，它具有以下优点：工作在压缩域上、速度快、鲁棒性好、精度更高．     

移动设备上基于内容的多媒体检索技术研究

随着互联网上多媒体资源的急剧增加以及移动设备功能的不断完善,如何在海量多媒体资源中快速检索出所需要的资料显得至关重要。传统的基于关键词描述的多媒体检索技术因其描述能力有限等原因已不能满足用户对于多媒体语义内容的检索要求,而且这些技术直接应用到性能相当有限的移动设备上也是不可行的。移动设备用户对精确而快速地检索多媒体资源的需求越来越强烈。本文详细介绍了在移动设备上进行基于内容的多媒体检索技术的研究成果。相比现有技术,这些研究成果无论准确度还是速度都有很大提升。