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检索条件"机构=MIRACL: Multimedia Information systems and Advanced Computing Laboratory"

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Experimentation and evaluation of a generator of adaptable web applications

Experimentation and evaluation of a generator of adaptable w...

引用

XXVIIIeme Congres INFORSID 2010 - 28th Conference INFORSID 2010

作者： Djemaa, Raoudha Ben Abdallah, Fatma Ben Amous, Ikram Hamadou, Abdelmajid Ben MIRACL Multimedia InfoRmation systems and Advanced Computing Laboratory Route de Tunis Km 10 BP 242 Cité El Ons Sfax 3021 Tunisia

The Web evolves to contents integrating increasingly rich and varied media reached using very diverse accessAA,A device. This environment very heterogeneous requires that multimedia information sent by the server is adapted to the precise conditions of their use. To answer this adaptation, a set of methods, languages and architectures were developed. This article is a contribution in this direction. In this work, we present a generator of the adaptable Web applications (AWA). An experimental study of the generator was undertaken on various devices of access (PC, PDA, mobile telephone.). The results obtained were evaluated by a study of the performances carried out to test the effectiveness of generator (rate of satisfaction of the users, profit in memory capacity, execution time, etc).

关键词： Adaptable web application Adaptation of the media objects Experimentation and evaluation Generator Sensitivity to the context

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Towards a modeling of video grammar based on a priori knowledge for the optimization of the audiovisual documents structuring

Towards a modeling of video grammar based on a priori knowle...

引用

International Conference on Computer Technology and Development (ICCTD)

作者： Tarek Zlitni Walid Mahdi Hanene Ben-Abdallah Multimedia Information Systems and Advanced Computing Laboratory Sfax MIR CI Tunisia

The emergence of the TV channels number and the appearance of the Internet led to an exponential growth of the audiovisual documents. Several works were proposed in the literature for automatic video segmentation. However, the effectiveness of these works depends on video type. So, for a better quality of the segmentation, it is necessary to consider a priori knowledge concerning video types. Besides, TV channels use a set of rules during the production and the streaming of their programs such as the respect of the graphic charter, the recurring of studios... The exploitation of these rules, as a priori knowledge for the temporal and/or semantic structuring of the video documents, would be then advantageous for the quality of the indexing and the performance of the multimedia systems. In this context, we propose a method for the extraction and the formalization of descriptors based on a priori knowledge in order to conceive a video grammar model. This model will be used thereafter for a multitude of interesting applications like automatic structuring of TV streams or TV news segmentation. Video grammar; video grammar modeling; multimedia descriptors; video indexing.

关键词： Biological system modeling Nonvolatile memory Random access memory multimedia communication Ferroelectric films TV

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A spatiotemporal text localization and identification approach for content-based video browsing 09

A spatiotemporal text localization and identification approa...

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7th International Conference on Advances in Mobile computing and multimedia, MoMM2009

作者： Bouaziz, Bassem Mahdi, Walid Zlitni, Tarek Benhamadou, Abdelmajid MIRACL: Multimedia Information Systems and Advanced Computing Laboratory CP 1030 Sfax Tunisia

ISBN: (纸本)9781605586595

Text in videos contains much semantic information that can be used for video indexing and browsing. In this paper, we propose a spatiotemporal video-text localization and identification approach which proceeds in two main steps: text region localization and text region identification. In the first step we detect the significant appearance of the new objects in a frame by a split and merge processes applied on binarized edge frame pair differences. Detected objects are, a priori, considered as text. They are then filtered according to both local contrast and texture criteria in order to get the effective ones. The resulted text regions are identified based on a visual grammar descriptor containing a set of semantic text class regions characterized by visual features. A visual table of content is generated based on extracted text regions occurring within video sequence enriched by a semantic identification. The experimentation performed on a variety of video sequences shows the efficiency of our. Copyright 2009 ACM.

关键词： Semantics

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Hand localization and fingers features extraction: Application to digit recognition in sign language

引用

10th International Conference on Intelligent Data Engineering and Automated Learning, IDEAL 2009

作者： Jmaa, A. Ben Mahdi, W. Jemaa, Y. Ben Hamadou, A. Ben Multimedia InfoRmation Systems and Advanced Computing Laboratory Tunisia Signal and System Research Unit Tunisia

ISBN: (纸本)3642043933

We present in this paper an approach of hand gesture analysis that aims at recognizing a digit. The analysis is based on extracting a set of features from a hand image and then combining them by using an induction graph. The most important features we extract from each image are the fingers locations, their heights and the distance between each pair of fingers. Our approach consists of three steps: (i) Hand localization, (ii) fingers extraction and (iii) features identification and combination to digit recognition. Each input image is assumed to contain only one hand with black background, thus we apply a classifier based on one skin color to identify the skin pixels. In the finger extraction step, we attempt to remove all the hand components except the fingers, this process is based on the hand anatomy properties. The final step is based on histogram representation of the detected fingers which results in the features identification, which results in the digit recognition. The approach is invariant to scale, rotation and translation of the hand. Some experiments have been undertaken to show the effectivness of the proposed approach. © 2009 Springer Berlin Heidelberg.

关键词： Feature extraction

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Structural relevance feedback in XML retrieval

Structural relevance feedback in XML retrieval

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8th International Conference on Flexible Query Answering systems, FQAS 2009

作者： Kamoun Fourati, Inès Tmar, Mohamed Hamadou, Abdelmajid Ben Multimedia Information Systems and Advanced Computing Laboratory High Institute of Computer Science and Multimedia University of Sfax Sfax Tunisia

ISBN: (纸本)3642049567

Contrarily to classical information retrieval systems, the systems that treat structured documents include the structural dimension through the document and query comparison. Thus, the retrieval of relevant results means the retrieval of document fragments that match the user need rather than the whole document. So, the structure notion should be taken into account during the retrieval process as well as during the reformulation. In this paper we propose an approach of query reformulation based on structural relevance feedback. We start from the original query on one hand and the fragments judged as relevant by the user on the other. Structure hints analysis allows us to identify nodes that match the user query and to rebuild it during the relevance feedback step. The main goal of this paper is to show the impact of structural hints in XML query optimization. Some experiments have been undertaken into a dataset provided by INEX to show the effectiveness of our proposals. © 2009 Springer-Verlag Berlin Heidelberg.

关键词： XML

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Query reformulation based on relevance feedback

Query reformulation based on relevance feedback

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8th International Conference on Flexible Query Answering systems, FQAS 2009

作者： Taktak, Imen Tmar, Mohamed Hamadou, Abdelmajid Ben Multimedia Information Systems and Advanced Computing Laboratory High Institute of Computer Science and Multimedia University of Sfax Sfax Tunisia

ISBN: (纸本)3642049567

In a Relevance Feedback process, the query can be reformulated basing on a matrix product of the RSV (Retrieval Status Value) vector and the documents-terms matrix. In such case, the challenge is to determine the most appropriate query that fulfils the retrieval process. In this paper, we present an automatic query reformulation approach based on a dual form of this product matrix which systematically generate as solution the reformulated query. This approach was spread to assure a learning strategy in order to rank the results of an information retrieval system. Some experiments have been undertaken into a dataset provided by TREC and the results show the effectiveness of our approach. © 2009 Springer-Verlag Berlin Heidelberg.

关键词： Search engines

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A new approach for TV program identification based on video grammar 09

A new approach for TV program identification based on video ...

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7th International Conference on Advances in Mobile computing and multimedia, MoMM2009

作者： Zlitni, Tarek Mahdi, Walid Ben Abdallah, Hanène Mir at cl Multimedia Information Systems and Advanced Computing Laboratory Higher Institute of Computer Science and Multimedia BP 3021 Sfax 69042 Tunisia

ISBN: (纸本)9781605586595

In this paper, we propose a new approach to identify programs in TV streams. In the first step of our approach, we construct a reference catalogue for video grammars of visual jingles. In the second step, we identify programs in TV streams by examining the similarity of the video signal to the visual grammars in the catalogue. After presenting our approach, we report the results of its experimental evaluation on several streams extracted from different channels and composed of several programs. Copyright 2009 ACM.

关键词： Indexing (of information)

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Extending fuzzy semantic model by advanced decision rules

Extending fuzzy semantic model by advanced decision rules

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Conference of the North American Fuzzy information Processing Society - NAFIPS

作者： Lassaad Ellouze Rafik Bouaziz Salem Chakhar MIRACL Multimedia Information systems and Advanced Computing Laboratory FSEGS Sfax Tunisia LAMSADE University of Paris Dauphine Paris France

This paper extends FSM, a recently proposed semantic data model that supports fuzziness, imprecision and uncertainty of real-world. More precisely, the paper proposes four new concepts, decisional grouping, inhibition, multiplicity and selection, which allows enhancing the modeling of real-world applications. It integrates these concepts in FSM by the definition of new decision rules.

关键词： Object oriented modeling Uncertainty Multiple sclerosis Fuzzy systems information systems Data models Proposals Diseases information processing multimedia systems

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An Artificial Vision-Based Lane Detection Algorithm

An Artificial Vision-Based Lane Detection Algorithm

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International Symposium on Computer Science and its Applications, CSA

作者： Nadra Ben Romdhane Mohamed Hammami Hanene Ben-Abdallah Department of Computer Science Multimedia Information Systems and Advanced Computing Laboratory Sfax Tunisia

ISBN: (纸本)9781424449453;9781424449460

In this paper, we present a lane detection algorithm based on hough transform and linear parabolic fitting. The candidate pixels are collected after image contrast enhancement while using morphological filters. The algorithm was tested on image sequences we filmed on the roads of Tunisia and on images from the PETS2001 dataset provided by Essex University (England). These images present different environment conditions such as shadow, partial coverage of the markings by obstacles, different lane markings that can be blurred or well contrasted, and different weather conditions.

关键词： Detection algorithms Road safety Road accidents Filters Surface morphology Road transportation Computer science multimedia systems multimedia computing information systems

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AViTExt: Automatic video text extraction

AViTExt: Automatic video text extraction

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2008 3rd International Conference on information and Communication Technologies: From Theory to Applications, ICTTA

作者： Bouaziz, Baseem Zlitni, Tarek Mahdi, Walid MIRACL: Multimedia Information systems and Advanced Computing Laboratory Sfax Tunisia

ISBN: (纸本)1424417511

In this paper, we propose a spatial temporal video-text detection technique which proceed in two principal steps: potential text region detection and a filtering process. In the first step we divide dynamically each pair of consecutive video frames into sub block in order to detect change. A significant difference between homologous blocks implies the appearance of an important object which may be a text region. The temporal redundancy is then used to filter these regions and forms an effective text region. The experimentation driven on a variety of video sequences shows the effectiveness of our approach by obtaining a 89,39% as precision rate and 90,19 as recall.

关键词： Indexing (of information)

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