共查询到17条相似文献，搜索用时 328 毫秒
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基于内容的图像检索技术是对图像的物理内容为加工对象的检索技术之一,主要实现方式包括基于颜色、纹理、形状、空间位置和语义等。其中基于颜色的图像检索发展最为成熟,而基于语义的检索则尚处于探讨、研究阶段。基于内容检索和基于文本检索在数字图书馆中可以融合共同提供检索服务。Google为这一尝试提供了在后控阶段的有效案例,而真正的实现两者的融合是在预处理阶段。两者结合在数字图书馆中的应用是可行的,相信能够提供更好的图像检索服务。 相似文献
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随着计算机网络和多媒体信息的迅猛发展，基于内容的图像检索技术成为研究热点。本文通过介绍了基于颜色、形状、纹理和空间特征的图像检索，阐述了利用单一特征检索的不足，提出和分析了多种综合特征的图像检索技术。 相似文献
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基于内容的图像检索技术在数字档案馆、网络信息安全、预防犯罪、知识产权、医疗诊断等领域有着广泛的应用。对基于内容的检索技术的研究意义和研究现状进行了阐述,着重介绍了基于内容（颜色、纹理、形状）的图像检索技术及其对于数字档案馆建设的意义。 相似文献
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刘丹 《现代图书情报技术》2010,26(5):50-57
研究将XML文本检索方法应用于长文本环境,并以中文博硕士论文为数据集。对博硕士论文数据集的XML标引、索引、关键词检索和结构化检索分别进行设计和实现,构建一个基于XML的中文博硕士论文检索系统。 相似文献
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现阶段,以图像内容为基础的图像检索的效率还是较低的,如何通过对图像的纹理、颜色和空间特征进行提取和分析,整合得出语义特征,实现对图像数据库的检索,已经成为了图像检索研究中的热门话题。本文将对相关反馈技术在图像内容及语义检索中的应用进行阐述。 相似文献
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介绍感性工学的产生背景，主要研究内容与实现原理，并结合图像检索问题，分析感性工学与图像检索的联系以及基于感性特征检索图像的系统架构。指出感性工学和基于感性特征检索图像研究中有待解决的问题。 相似文献
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基于特征对图像进行检索是指在建立图像库、将输入图像存入图像库的同时 ,将其对应的特征向量也存入与图像库相连的特征库。检索时 ,分析查询图并提取该图的特征向量 ,然后搜索。颜色是图像的最显著特征。图 1。参考文献 2 6。 相似文献
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数字图书馆中基于内容的图像检索技术 总被引：4，自引：0，他引：4
基于内容的检索是随着多媒体技术的发展而日渐明显的多媒体数据库查询和检索方法,它根据媒体对象的语义、特征等进行检索,其主要包括图像(Image)检索、视频(Video)检索、音频(Audio)检索。本文讨论了实现数字图书馆中基于内容的图像检索的关键技术,论述了每个阶段的研究特点,对基于内容的图像检索的主要研究技术进行详细和全面的论述,介绍了典型的基于内容的图像检索原型系统与数字图书馆系统,通过综述指出了目前研究中存在的主要问题并指出了今后的研究方向。 相似文献
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基于语义的图像检索系统的构建包括以下工作:设计高层语义的描述方式;图像语义 提取,即如何从视觉特征映射到高层语义;语义检索系统的实现。基于MPEC-7图像语义的 XML描述和系统检索的实现方法,构建了基于语义的图像检索系统的框架。图4。参考文献8。 相似文献
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XML检索系统及其比较研究* 总被引：2，自引：0，他引：2
探讨XML检索与传统信息检索的区别、XML检索的目标与任务以及XML检索系统研究的核心问题,并对现有的几个XML检索系统进行介绍和比较研究。 相似文献
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Locating and Recognizing Text in WWW Images 总被引：4，自引：0，他引：4
The explosive growth of the World Wide Web has resulted in a distributed database consisting of hundreds of millions of documents. While existing search engines index a page based on the text that is readily extracted from its HTML encoding, an increasing amount of the information on the Web is embedded in images. This situation presents a new and exciting challenge for the fields of document analysis and information retrieval, as WWW image text is typically rendered in color and at very low spatial resolutions. In this paper, we survey the results of several years of our work in the area. For the problem of locating text in Web images, we describe a procedure based on clustering in color space followed by a connected-components analysis that seems promising. For character recognition, we discuss techniques using polynomial surface fitting and fuzzy n-tuple classifiers. Also presented are the results of several experiments that demonstrate where our methods perform well and where more work needs to be done. We conclude with a discussion of topics for further research. 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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一种基于Native XML的全文检索引擎 总被引：5，自引：0，他引：5
随着XML的日益流行 ,基于XML的全文检索应用需求也迅速扩大。在这些应用中 ,native XML数据库是发展方向。虽然商业化的native XML数据库已经出现 ,但其全文检索的性能还不尽人意。本文提出一种方法 :在传统的倒排索引的框架下 ,对XML的标记建立索引 ,使得一个全文数据库能够以Native的方式存储、索引、检索和输出XML文档 ,成为一个真正意义上的native XML全文数据库 ,既有传统全文数据库的优越性能 ,又能满足基于na tive XML的应用需求 相似文献
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Information Retrieval from Documents: A Survey 总被引：4，自引：0，他引：4
Given the phenomenal growth in the variety and quantity of data available to users through electronic media, there is a great demand for efficient and effective ways to organize and search through all this information. Besides speech, our principal means of communication is through visual media, and in particular, through documents. In this paper, we provide an update on Doermann's comprehensive survey (1998) of research results in the broad area of document-based information retrieval. The scope of this survey is also somewhat broader, and there is a greater emphasis on relating document image analysis methods to conventional IR methods.Documents are available in a wide variety of formats. Technical papers are often available as ASCII files of clean, correct, text. Other documents may only be available as hardcopies. These documents have to be scanned and stored as images so that they may be processed by a computer. The textual content of these documents may also be extracted and recognized using OCR methods. Our survey covers the broad spectrum of methods that are required to handle different formats like text and images. The core of the paper focuses on methods that manipulate document images directly, and perform various information processing tasks such as retrieval, categorization, and summarization, without attempting to completely recognize the textual content of the document. We start, however, with a brief overview of traditional IR techniques that operate on clean text. We also discuss research dealing with text that is generated by running OCR on document images. Finally, we also briefly touch on the related problem of content-based image retrieval. 相似文献
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在现有的裁判文书检索系统上,非专业领域的用户检索具有局限性。目前,法律领域的智能检索仅在基于裁判文书的法律条文的推荐和分类上开展了研究,缺乏对裁判文书自动推荐的相关研究,因此,本文提出了一种利用类新闻的事实性文本智能推荐裁判文书的方法,结合目前的研究工作,总结裁判文书的结构和内容特征,利用类新闻的事实性文本模拟非法律专业用户的检索查询式,构建含有结构内容特征的裁判文书语料库,并自动推荐相关裁判文书文档。结果显示,利用裁判文书的法院意见结构内容特征,对新闻语料进行特征词表示之后,LambdaMART模型在文本匹配结果上表现良好,优于传统的全文检索技术。 相似文献