利用语义关系抽取生成生物医学文摘的算法

通过自动摘要技术对生物医学概念进行摘要抽取,能够提高研究人员查阅和分析相关资料的效率.利用生物医学语义关系抽取多文档摘要,旨在从语义层面比较全面地覆盖查询概念的多方面内容,帮助研究人员快速掌握查询概念的主要信息.从生物医学文本中挖掘出了概念的重要语义关系,并利用语义关系作为衡量句子重要性的特征,生成查询概念的摘要.分析...     

基于评论质量的多文档文本情感摘要

文本情感摘要任务旨在对带有情感的文本数据进行浓缩、提炼进而产生文本所表达的关于情感意见的摘要,用以帮助用户更好地阅读、理解情感文本的内容。该文主要研究多文档的文本情感摘要问题,重点针对网络上存在的同一个产品的多个评论进行摘要抽取。在情感文本中,情感相关性是一个重要的特点,该文将充分考虑情感信息对文本情感摘要的重要影响。同时,对于评论语料,质量高的评论或者说可信度高的评论可以帮助用户更好的了解评论中所评价的对象。因此,该文将充分考虑评论质量对文本情感摘要的影响。并且为了进行关于文本情感摘要的研究,该文收集并标注了一个基于产品评论的英文多文档文本情感摘要语料库。实验证明,情感信息和评论质量能够帮助多文档文本情感摘要,提高摘要效果。     

SUBTOPIC‐BASED MULTIMODALITY RANKING FOR TOPIC‐FOCUSED MULTIDOCUMENT SUMMARIZATION

Topic‐focused multidocument summarization has been a challenging task because the created summary is required to be biased to the given topic or query. Existing methods consider the given topic as a single coarse unit, and then directly incorporate the relevance between each sentence and the single topic into the sentence evaluation process. However, the given topic is usually not well defined and it consists of a few explicit or implicit subtopics. In this study, the related subtopics are discovered from the topic's narrative text or document set through topic analysis techniques. Then, the sentence relationships against each subtopic are considered as an individual modality and the multimodality manifold‐ranking method is proposed to evaluate and rank sentences by fusing the multiple modalities. Experimental results on the DUC benchmark data sets show the promising results of our proposed methods.     

AN OPTIMIZATION APPROACH TO AUTOMATIC GENERIC DOCUMENT SUMMARIZATION

In this paper, we have presented an optimization approach to document summarization. The potential of optimization based document summarization models has not been well explored to date. This is partially the difficulty to formulate the criteria used for objective assessment. We modeled document summarization as the linear and nonlinear optimization problems. These models generally attempt simultaneously to balance coverage and diversity in the summary. To solve the optimization problem we developed a novel particle swarm optimization (PSO) algorithm. Experiments showed our linear and nonlinear models produce very competitive results, which significantly outperform the NIST baselines in both years. More important, although linear and nonlinear models are comparable to the top three systems S24, S15, and S12 in the DUC2006, they are even superior to the best participating system in the DUC2005.     

VSUMM: A mechanism designed to produce static video summaries and a novel evaluation method

The fast evolution of digital video has brought many new multimedia applications and, as a consequence, has increased the amount of research into new technologies that aim at improving the effectiveness and efficiency of video acquisition, archiving, cataloging and indexing, as well as increasing the usability of stored videos. Among possible research areas, video summarization is an important topic that potentially enables faster browsing of large video collections and also more efficient content indexing and access. Essentially, this research area consists of automatically generating a short summary of a video, which can either be a static summary or a dynamic summary. In this paper, we present VSUMM, a methodology for the production of static video summaries. The method is based on color feature extraction from video frames and k-means clustering algorithm. As an additional contribution, we also develop a novel approach for the evaluation of video static summaries. In this evaluation methodology, video summaries are manually created by users. Then, several user-created summaries are compared both to our approach and also to a number of different techniques in the literature. Experimental results show - with a confidence level of 98% - that the proposed solution provided static video summaries with superior quality relative to the approaches to which it was compared.     

一种草图形式的视频摘要生成方法

视频摘要作为一种视频内容的简要表示,能够有效地增强用户浏览和组织视频的效率。提出了一种基于草图的视频摘要生成方法。与以往的静态视频摘要方法不同,该方法结合视频内容分析,利用草图在表达上的简洁性和抽象性,对视频中的主要内容进行表达。首先通过视频分析获取视频中的语义特征并提取关键帧,然后通过交互式的方法从关键帧中生成草图,最后进行摘要布局生成完整的视频摘要。实验结果表明,该方法能够有效突出视频的主要对象和主要事件,并具有较高的用户满意度。     

SSC软聚类算法在面向查询的多文档文摘中的应用

针对面向查询的多文档自动文摘,本文将查询句混入多文档集合中的各句子中间,采用高效的软聚类算法SSC对所有的句子进行聚类。采用轮转法抽取文摘句,最后生成文摘。该方法在DUC2005的语料中测试效果很好。     

一种面向查询的多文档摘要方法

面向查询的多文档摘要技术有两个难点 第一,为了保证摘要与查询密切相关,容易造成摘要内容重复,不够全面;第二,原始查询难以完整描述查询意图,需进行查询扩展,而现有查询扩展方法多依赖于外部语义资源。针对以上问题,该文提出一种面向查询的多文档摘要方法,利用主题分析技术识别出当前主题下的子主题,综合考虑句子所在的子主题与查询的相关度以及子主题的重要度两方面因素来选择摘要句,并根据词语在子主题之间的共现信息,在不使用任何外部知识的情况下,进行查询扩展。在DUC2006评测语料上的实验结果表明,与Baseline系统相比,该系统取得了更高的ROUGE评价值,基于子主题的查询扩展方法则进一步提高了摘要的质量。     

Audiovisual integration with Segment Models for tennis video parsing

Automatic video content analysis is an emerging research subject with numerous applications to large video databases and personal video recording systems. The aim of this study is to fuse multimodal information in order to automatically parse the underlying structure of tennis broadcasts. The frame-based observation distributions of Hidden Markov Models are too strict in modeling heterogeneous audiovisual data. We propose instead the use of segmental features, of the framework of Segment Models, to overcome this limitation and extend the synchronization points to the segment boundaries. Considering each segment as a video scene, auditory and visual features collected inside the scene boundaries can thus be sampled and modeled with their native sampling rates and models. Experimental results on a corpus of 15-h tennis video demonstrated a performance superiority of Segment Models with synchronous audiovisual fusion over Hidden Markov Models. Results though with asynchronous fusion are less optimistic.     

Play segmentation for the play–break based sports video using a local adaptive model

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.