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  • 1
    Electronic Resource
    Electronic Resource
    A Multi-Resolution Content-Based Retrieval Approach for Geographic Images (1999)
    Springer
    Geoinformatica 3 (1999), S. 109-139 
    Details
    ISSN: 1573-7624
    Keywords: geographical image retrieval ; multi-resolution wavelet transform ; texture features ; hierarchical clustering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
    Notes: Abstract Current retrieval methods in geographic image databases use only pixel-by-pixel spectral information. Texture is an important property of geographical images that can improve retrieval effectiveness and efficiency. In this paper, we present a content-based retrieval approach that utilizes the texture features of geographical images. Various texture features are extracted using wavelet transforms. Based on the texture features, we design a hierarchical approach to cluster geographical images for effective and efficient retrieval, measuring distances between feature vectors in the feature space. Using wavelet-based multi-resolution decomposition, two different sets of texture features are formulated for clustering. For each feature set, different distance measurement techniques are designed and experimented for clustering images in a database. The experimental results demonstrate that the retrieval efficiency and effectiveness improve when our clustering approach is used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009859912970
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    QoS Management in Educational Digital Library Environments (2000)
    Springer
    Multimedia tools and applications 10 (2000), S. 133-156 
    Details
    ISSN: 1573-7721
    Keywords: quality of service (QoS) ; multimedia ; synchronization ; digital libraries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Advances in multimedia computing technologies offer new approaches to the support of computer-assisted education and training within many application domains. Novel interactive presentation tools can be built to enhance traditional teaching methods with more active learning. Since a variety of user expectations are possible in such an environment, research must address the incorporation of these factors into presentation tools. During an interactive learning/training process, presentation tools must be able to handle various types of delays. A flexibly adjustable quality of service (QoS) should thus be supported. In this paper, we investigate a framework and systematic strategies for supporting the continuous and synchronized retrieval and presentation of multimedia data streams in a client/server distributed multimedia environment for educational digital libraries. Specifically, we establish a practical framework for specifying multimedia objects, tasks, schedules, and synchronization constraints between media streams. We identify the QoS parameters critical to the support of multimedia presentations for learning and training activities. Based on the proposed framework and QoS specifications, we develop presentation scheduling and buffer management strategies which can enforce the specified QoS requirements in an educational digital library environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009658617338
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    Paper (German National Licenses)
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