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Miquel Ferrer, Ernest Valveny, F. Serratosa, K. Riesen and Horst Bunke. 2008. An Approximate Algorith for Median Graph Computation using Graph Embedding. 19th International Conference on Pattern Recognition..
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Dimosthenis Karatzas, Marçal Rusiñol, Coen Antens and Miquel Ferrer. 2008. Segmentation Robust to the Vignette Effect for Machine Vision Systems. 19th International Conference on Pattern Recognition.
Abstract: The vignette effect (radial fall-off) is commonly encountered in images obtained through certain image acquisition setups and can seriously hinder automatic analysis processes. In this paper we present a fast and efficient method for dealing with vignetting in the context of object segmentation in an existing industrial inspection setup. The vignette effect is modelled here as a circular, non-linear gradient. The method estimates the gradient parameters and employs them to perform segmentation. Segmentation results on a variety of images indicate that the presented method is able to successfully tackle the vignette effect.
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Partha Pratim Roy, Umapada Pal, Josep Llados and F. Kimura. 2008. Convex Hull based Approach for Multi-oriented Character Recognition form Graphical Documents. 19th International Conference on Pattern Recognition.
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Miquel Ferrer, Ernest Valveny, F. Serratosa and Horst Bunke. 2008. Exact Median Graph Computation via Graph Embedding. 12th International Workshop on Structural and Syntactic Pattern Recognition.15–24. (LNCS.)
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Jose Antonio Rodriguez, Florent Perronnin, Gemma Sanchez and Josep Llados. 2008. Unsupervised writer style adaptation for handwritten word spotting. Pattern Recognition. 19th International Conference on, IBM Best Student Paper Award..
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Alicia Fornes, Josep Llados, Gemma Sanchez and Horst Bunke. 2008. Writer Identification in Old Handwritten Music Scores. Proceedings of the 8th International Workshop on Document Analysis Systems,.347–353.
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Partha Pratim Roy, Umapada Pal and Josep Llados. 2008. Recognition of Multi-oriented Touching Characters in Graphical Documents. Computer Vision, Graphics & Image Processing, 2008. Sixth Indian Conference on,.297–304.
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Muhammad Muzzamil Luqman, Thierry Brouard, Jean-Yves Ramel and Josep Llados. 2012. Recherche de sous-graphes par encapsulation floue des cliques d'ordre 2: Application à la localisation de contenu dans les images de documents graphiques. Colloque International Francophone sur l'Écrit et le Document.149–162.
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Jose Antonio Rodriguez, Gemma Sanchez and Josep Llados. 2008. Categorization of Digital Ink Elements using Spectral Features. In W. Liu, J.L., J.M. Ogier, ed. Graphics Recognition: Recent Advances and New Opportunities. Springer–Verlag, 188–198. (LNCS.)
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Miquel Ferrer, Ernest Valveny and F. Serratosa. 2009. Median graph: A new exact algorithm using a distance based on the maximum common subgraph. PRL, 30(5), 579–588.
Abstract: Median graphs have been presented as a useful tool for capturing the essential information of a set of graphs. Nevertheless, computation of optimal solutions is a very hard problem. In this work we present a new and more efficient optimal algorithm for the median graph computation. With the use of a particular cost function that permits the definition of the graph edit distance in terms of the maximum common subgraph, and a prediction function in the backtracking algorithm, we reduce the size of the search space, avoiding the evaluation of a great amount of states and still obtaining the exact median. We present a set of experiments comparing our new algorithm against the previous existing exact algorithm using synthetic data. In addition, we present the first application of the exact median graph computation to real data and we compare the results against an approximate algorithm based on genetic search. These experimental results show that our algorithm outperforms the previous existing exact algorithm and in addition show the potential applicability of the exact solutions to real problems.
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