共查询到20条相似文献，搜索用时 62 毫秒
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数字化网络化导致大量多媒体信息资源的出现,而目前基于关键词的检索方法对于多媒体数据检索显得有些相形见绌,于是基于内容的多媒体信息存取检索技术应运而生。NPEG一7作为一个多媒体内容描述的标准,对多媒体信息进行标准化的描述,从而实现对多媒体内容快速有效的检索。 相似文献
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基于MPEG-7的图像内容描述方案研究 总被引：5，自引：0，他引：5
多媒体内容检索是互联网应用的一种重要方面 ,如何准确地描述多媒体信息特别是图像信息是多媒体信息检索必须要解决的问题。本文提出一种基于MPEG 7标准的图像内容的描述方案 ,可以用于多媒体内容检索中的图像检索。文章首先介绍了MPEG 7标准以及MPEG 7标准中的多媒体描述方案 ,然后叙述基于MPEG 7的图像描述方案的技术与相关特征 ,最后给出一个具体的基于MPEG 7的图像描述方案的实际例子 相似文献
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Katharine Treptow Farrell Marc Truitt 《Library Collections, Acquisitions, and Technical Services》2005,28(4):473-487
Vendor records are one of the key components underpinning the acquisitions record in the integrated library system. Acquisitions and collection development practitioners increasingly need to record, access, and manipulate acquisitions vendor metadata for purposes not foreseen by the architects of current generation ILSs. The authors posit that vendor records can serve as an appropriate metaphor for the entire acquisitions record in the development of standards. The analysis of data elements and proposed grouping into fields, records, and metarecords suggests a direction for further development and enhanced functionality. The authors call on librarians, systems vendors, and materials vendors to engage in a dialog aimed at creating an accepted standard for vendor records that will meet the needs of all parties. 相似文献
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《Library Collections, Acquisitions, and Technical Services》2004,28(4):473-487
Vendor records are one of the key components underpinning the acquisitions record in the integrated library system. Acquisitions and collection development practitioners increasingly need to record, access, and manipulate acquisitions vendor metadata for purposes not foreseen by the architects of current generation ILSs. The authors posit that vendor records can serve as an appropriate metaphor for the entire acquisitions record in the development of standards. The analysis of data elements and proposed grouping into fields, records, and metarecords suggests a direction for further development and enhanced functionality. The authors call on librarians, systems vendors, and materials vendors to engage in a dialog aimed at creating an accepted standard for vendor records that will meet the needs of all parties. 相似文献
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一种新型的多媒体检索技术 --基于内容的检索 总被引：17，自引：0，他引：17
基于内容的检索是一种新型的多媒体检索技术。本文比较了传统的多媒体信息检索方法和基于内容的检索方法的异同,叙述了基于内容的图像、音频检索技术的要点,指出了在检索多媒体信息时需要解决的几个问题。 相似文献
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Finding useful information from large multimodal document collections such as the WWW without encountering numerous false positives poses a challenge to multimedia information retrieval systems (MMIR). This research addresses the problem of finding pictures. The fact that images do not appear in isolation, but rather with accompanying, collateral text is exploited. Taken independently, existing techniques for picture retrieval using (i) text-based and (ii) image-based methods have several limitations. This research presents a general model for multimodal information retrieval that addresses the following issues: (i) users' information need, (ii) expressing information need through composite, multimodal queries, and (iii) determining the most appropriate weighted combination of indexing techniques in order to best satisfy information need. A machine learning approach is proposed for the latter. The focus is on improving precision and recall in a MMIR system by optimally combining text and image similarity. Experiments are presented which demonstrate the utility of individual indexing systems in improving overall average precision. 相似文献
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As the volume and variety of information sources continues to grow, there is increasing difficulty with respect to obtaining
information that accurately matches user information needs. A number of factors affect information retrieval effectiveness
(the accuracy of matching user information needs against the retrieved information). First, users often do not present search
queries in the form that optimally represents their information need. Second, the measure of a document’s relevance is often
highly subjective between different users. Third, information sources might contain heterogeneous documents, in multiple formats
and the representation of documents is not unified. This paper discusses an approach for improvement of information retrieval
effectiveness from document databases. It is proposed that retrieval effectiveness can be improved by applying computational
intelligence techniques for modelling information needs, through interactive reinforcement learning. The method combines qualitative
(subjective) user relevance feedback with quantitative (algorithmic) measures of the relevance of retrieved documents. An
information retrieval is developed whose retrieval effectiveness is evaluated using traditional precision and recall. 相似文献
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《Cataloging & classification quarterly》2013,51(4):43-61
ABSTRACT This article illustrates the collaboration of three entities- the library, its online system and the authority service vendor-to achieve online authority control in a medium-sized academic library efficiently and cost-effectively. The authority service vendor checks and revises (as needed) the headings of the library's new bibliographic records, providing new authority records for them. Through a separate notification service, the vendor also provides revised authority records for the existing authority file, alerting the library when in-house online maintenance is needed. In this online environment, authority records and bibliographic records are maintained automatically by the vendor authority service. Thus, using various authority heading reports which can be generated by the local online system in conjunction with the notification service, the library concentrates its authority work on the elimination or correction of obsolete headings. The authority vendor services are effective and reduce the cost of maintaining the online catalog. Ultimately, accurate standardized headings enhance the ease and effectiveness of online searching and retrieval for all who consult the library's catalog. 相似文献
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论图书馆网络多媒体检索数据库设计 总被引：1，自引：0，他引：1
本文讨论如何通过传统的数据库技术与目前流行的媒体播放技术相结合 ,实现图书馆网络多媒体数据检索。文中分析了图书馆多媒体数据库结构特征及访问操作的实现 ,提出了图书馆多媒体检索数据库结构设计的两个方案 :一种是基于文件的方法 ,它将多媒体信息的一些属性和状态记在数据库中 ,这是一种准多媒体数据库技术 ;另一种是基于数据库中二进制对象 ,使用了数据库引擎中的二进制域类型 相似文献
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数字图书馆中多媒体数据库信息的检索 总被引：1，自引：0，他引：1
数字图书馆是一种新概念和新技术,数据类型包括文本、语音、图像、视频等多媒体信息.文章主要介绍了数字图书馆多媒体数据库信息中基于内容的图像、音频、视频检索技术,并阐述多媒体数据库信息检索技术的发展趋势. 相似文献
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声音与图象信息的存贮和检索研究 总被引：5，自引：0，他引：5
本文首先分析了声音与图像信息的存贮处理, 接着分类阐述了声音、图像信息检索可以采用的方法和技术; 在此基础上, 对多媒体信息检索系统的数据模型进行了比较研究, 提出在目前技术条件下, 多媒体信息检索系统的设计可采用现有成熟的关系数据库系统作为基础, 并在关系模型里增加处理复杂对象与多媒体数据的能力, 以实现对声音、图像等多媒信息的存贮与检索。 相似文献
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��ý����Ϣ�����еĹؼ����� 总被引：6，自引：0，他引：6
首先介绍多媒体信息检索的多类型、交互性、同步性、实时性、便捷性等特点,然后论述多媒体信息检索涉及的关键技术,最后列举目前研制成功的典型多媒体信息检索系统。 相似文献
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论图书馆网络多媒体检索数据库设计 总被引：3，自引：0，他引：3
讨论如何通过传统的数据库技术与目前流行的媒体播技术相结合，实现图书馆网络多媒体数据检索。分析了图书馆多媒体数据库结构特征及访问操作的实现，提出了图书馆多媒体检索数据库结构设计的两个方案：一种是基于文件的方法，它将多媒体信息的一些属性和状态记在数据库中，这是一种准多媒体数据库技术；另一种是基于数据库中二进制对象，使用了数据库引擎中二进制域类型。 相似文献