Y. Abe, M. Azumatani, S. Mukouda, and . Suzuky, Discrimination of symbols, lines and characters in flowchart recognition, 8th International Conference on Pattern Recognition, pp.1071-1074, 1986.

J. Codina, E. Pianta, S. Vrochidis, and S. Papadopoulos, Integration of semantic, metadata and image search engines with a text search engine for patent retrieval, 2009.

L. A. Fletcher and R. Kasturi, A robust algorithm for text string separation from mixed text/graphics images. Pattern Analysis and Machine Intelligence, IEEE Transactions on, vol.10, issue.6, pp.910-918
DOI : 10.1109/34.9112

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=

R. P. Futrelle and N. Nikolakis, Efficient analysis of complex diagrams using constraint-based parsing. In Document Analysis and Recognition, Proceedings of the Third International Conference on, pp.782-790, 1995.

A. Hanbury, N. Bhatti, M. Lupu, and R. Mörzinger, Patent image retrieval, Proceedings of the 4th workshop on Patent information retrieval, PaIR '11, pp.3-8, 2011.
DOI : 10.1145/2064975.2064979

S. Ito, Automatic input of flow chart in document images, 6th international conference on Software engineering, pp.319-328, 1982.

R. Kasturi, S. T. Bow, W. El-masri, J. Shah, J. R. Gattiker et al., A system for interpretation of line drawings. Pattern Analysis and Machine Intelligence, IEEE Transactions on, vol.12, issue.10, pp.978-992, 1990.

O. Kolak and P. Resnik, OCR error correction using a noisy channel model, Proceedings of the second international conference on Human Language Technology Research -, 2002.
DOI : 10.3115/1289189.1289208

O. Kolak, W. Byrne, and P. Resnik, A generative probabilistic OCR model for NLP applications, Proceedings of the 2003 Conference of the North American Chapter of the Association for Computational Linguistics on Human Language Technology , NAACL '03, 2003.
DOI : 10.3115/1073445.1073463

A. Lemaitre, H. Mouchere, J. Camillerapp, and B. Coasnon, Interest of Syntactic Knowledge for On-Line Flowchart Recognition, 9th IAPR International Workshop on Graphics RECognition, pp.85-88, 2010.
DOI : 10.1007/978-3-540-89962-4_6

URL : https://hal.archives-ouvertes.fr/hal-00854450

H. Luo, G. Agam, and I. Dinstein, Directional mathematical morphology approach for line thinning and extraction of character strings from maps and line drawings, Document Analysis and Recognition Proceedings of the Third International Conference on, pp.257-260, 1995.

G. Nagy, Twenty years of document image analysis in pami. Pattern Analysis and Machine Intelligence, IEEE Transactions on, vol.22, issue.1, pp.38-62, 2000.

F. Piroi, M. Lupu, A. Hanbury, and V. Zenz, CLEF-IP 2011: Retrieval in the Intellectual Property Domain, 2011.

W. Szwoch, Recognition, Understanding and Aestheticization of Freehand Drawing Flowcharts, Ninth International Conference on Document Analysis and Recognition (ICDAR 2007) Vol 2, pp.1138-1142, 2007.
DOI : 10.1109/ICDAR.2007.4377093

B. G. Vasudevan, S. Dhanapanichkul, and R. Balakrishnan, Flowchart knowledge extraction on image processing, 2008 IEEE International Joint Conference on Neural Networks (IEEE World Congress on Computational Intelligence), pp.4075-4082, 2008.
DOI : 10.1109/IJCNN.2008.4634384

S. Vrochidis, S. Papadopoulos, and A. Moumtzidou, Towards content-based patent image retrieval: A framework perspective, World Patent Information, vol.32, issue.2, pp.94-106, 2010.
DOI : 10.1016/j.wpi.2009.05.010

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=

J. Yoo, M. Kim, S. Y. Ban, and Y. Kwon, Line removal and restoration of handwritten characters on the form documents, Document Analysis and Recognition Proceedings of the Fourth International Conference on, pp.128-131619827, 1997.

Y. Yu, A. Samal, and S. C. Seth, A system for recognizing a large class of engineering drawings. Pattern Analysis and Machine Intelligence, IEEE Transactions on, vol.19, issue.8, pp.868-890, 1997.