Now showing items 1-7 of 7

    • A generic framework for median graph computation based on a recursive embedding approach 

      Ferrer Sumsi, Miquel; Karatzas, D; Valveny, Ernest; Bardaji Goikoetxea, Itziar; Bunke, Horst (2011)
      Article
      Open Access
      The median graph has been shown to be a good choice to obtain a representative of a set of graphs. However, its computation is a complex problem. Recently, graph embedding into vector spaces has been proposed to obtain ...
    • A recursive embedding approach to median graph computation 

      Ferrer Sumsi, Miquel; Valveny, Ernest; Bunke, Horst (Springer Verlag, 2009-06-12)
      Part of book or chapter of book
      Open Access
      The median graph has been shown to be a good choice to infer a representative of a set of graphs. It has been successfully applied to graph-based classification and clustering. Nevertheless, its computation is extremely ...
    • An approximate algorithm for median graph computation using graph embedding 

      Ferrer Sumsi, Miquel; Valveny, Ernest; Serratosa Casanelles, Francesc; Riesen, Kaspar; Bunke, Horst (Institute of Electrical and Electronics Engineers (IEEE), 2008)
      Conference report
      Restricted access - publisher's policy
      Graphs are powerful data structures that have many attractive properties for object representation. However, some basic operations are difficult to define and implement, for instance, how to obtain a representative of a ...
    • An iterative algorithm for approximate median graph computation 

      Ferrer Sumsi, Miquel; Bunke, Horst (Institute of Electrical and Electronics Engineers (IEEE), 2010)
      Conference report
      Restricted access - publisher's policy
      Recently, the median graph has been shown to be a good choice to obtain a representative of a given set of graphs. It has been successfully applied to graph-based classification and clustering. In this paper we exploit a ...
    • Generalized median graph computation by means of graph embedding in vector spaces 

      Ferrer Sumsi, Miquel; Valveny, Ernest; Serratosa Casanelles, Francesc; Riesen, Kaspar; Bunke, Horst (2010)
      Article
      Restricted access - publisher's policy
      The median graph has been presented as a useful tool to represent a set of graphs. Nevertheless its computation is very complex and the existing algorithms are restricted to use limited amount of data. In this paper we ...
    • Graph-based k-means clustering: A comparison of the set versus the generalized median graph 

      Ferrer Sumsi, Miquel; Valveny, Ernest; Serratosa Casanelles, Francesc; Bardaji Goikoetxea, Itziar; Bunke, Horst (Springer Berlin / Heidelberg, 2009)
      Part of book or chapter of book
      Restricted access - publisher's policy
      In this paper we propose the application of the generalized median graph in a graph-based k-means clustering algorithm. In the graph-based k-means algorithm, the centers of the clusters have been traditionally represented ...
    • Rule-based fuzzy object similarity 

      Bunke, Horst; Fàbregas, Xavier; Kandel, Abraham (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2001)
      Article
      Open Access
      A new similarity measure for objects that are represented by feature vectors of fixed dimension is introduced. It can simultaneously deal with numeric and symbolic features. Also, it can tolerate missing feature values. ...