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Marçal Rusiñol and Josep Llados. 2010. Efficient Logo Retrieval Through Hashing Shape Context Descriptors. 9th IAPR International Workshop on Document Analysis Systems.215–222.
Abstract: In this paper, we present an approach towards the retrieval of words from graphical document images. In graphical documents, due to presence of multi-oriented characters in non-structured layout, word indexing is a challenging task. The proposed approach uses recognition results of individual components to form character pairs with the neighboring components. An indexing scheme is designed to store the spatial description of components and to access them efficiently. Given a query text word (ascii/unicode format), the character pairs present in it are searched in the document. Next the retrieved character pairs are linked sequentially to form character string. Dynamic programming is applied to find different instances of query words. A string edit distance is used here to match the query word as the objective function. Recognition of multi-scale and multi-oriented character component is done using Support Vector Machine classifier. To consider multi-oriented character strings the features used in the SVM are invariant to character orientation. Experimental results show that the method is efficient to locate a query word from multi-oriented text in graphical documents.
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Farshad Nourbakhsh, Dimosthenis Karatzas and Ernest Valveny. 2010. A polar-based logo representation based on topological and colour features. 9th IAPR International Workshop on Document Analysis Systems.341–348.
Abstract: In this paper, we propose a novel rotation and scale invariant method for colour logo retrieval and classification, which involves performing a simple colour segmentation and subsequently describing each of the resultant colour components based on a set of topological and colour features. A polar representation is used to represent the logo and the subsequent logo matching is based on Cyclic Dynamic Time Warping (CDTW). We also show how combining information about the global distribution of the logo components and their local neighbourhood using the Delaunay triangulation allows to improve the results. All experiments are performed on a dataset of 2500 instances of 100 colour logo images in different rotations and scales.
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Sebastien Mace, Herve Locteau, Ernest Valveny and Salvatore Tabbone. 2010. A system to detect rooms in architectural floor plan images. 9th IAPR International Workshop on Document Analysis Systems.167–174.
Abstract: In this article, a system to detect rooms in architectural floor plan images is described. We first present a primitive extraction algorithm for line detection. It is based on an original coupling of classical Hough transform with image vectorization in order to perform robust and efficient line detection. We show how the lines that satisfy some graphical arrangements are combined into walls. We also present the way we detect some door hypothesis thanks to the extraction of arcs. Walls and door hypothesis are then used by our room segmentation strategy; it consists in recursively decomposing the image until getting nearly convex regions. The notion of convexity is difficult to quantify, and the selection of separation lines between regions can also be rough. We take advantage of knowledge associated to architectural floor plans in order to obtain mostly rectangular rooms. Qualitative and quantitative evaluations performed on a corpus of real documents show promising results.
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Joan Mas, Gemma Sanchez, Josep Llados and B. Lamiroy. 2007. An Incremental On-line Parsing Algorithm for Recognizing Sketching Diagrams. 9th IEEE International Conference on Document Analysis and Recognition.452–456.
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Marçal Rusiñol, Josep Llados and Philippe Dosch. 2007. Camera-Based Graphical Symbol Detection. 9th IEEE International Conference on Document Analysis and Recognition.884–888.
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Miquel Ferrer and Ernest Valveny. 2007. Combination of OCR Engines for Page Segmentation based on Performance Evaluation. 9th International Conference on Document Analysis and Recognition.784–788.
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Josep Llados and Gemma Sanchez. 2007. Indexing Historical Documents by Word Shape Signatures. 9th International Conference on Document Analysis and Recognition.362–366.
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Oriol Ramos Terrades, Salvatore Tabbone and Ernest Valveny. 2007. A Review of Shape Descriptors for Document Analysis. 9th International Conference on Document Analysis and Recognition.227–231.
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S. Chanda, Oriol Ramos Terrades and Umapada Pal. 2007. SVM Based Scheme for Thai and English Script Identification. 9th International Conference on Document Analysis and Recognition.551–555.
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Jose Antonio Rodriguez, Gemma Sanchez and Josep Llados. 2007. A Pen-based Interface for Real-time Document Edition. 9th International Conference on Document Analysis and Recognition..939–944.
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