J. Cousty, L. Najman, and J. Serra, Some Morphological Operators in Graph Spaces, Mathematical Morphology and Its Application to Signal and Image Processing - Proceedings of the 9th International Symposium on Mathematical Morphology, pp.149-160, 2009.
DOI : 10.1016/j.patrec.2008.03.019

URL : https://hal.archives-ouvertes.fr/hal-00622403

F. Dias, J. Cousty, and L. Najman, Some Morphological Operators on Simplicial Complex Spaces, Discrete Geometry for Computer Imagery -Proceedings of the 16th IAPR International Conference, pp.441-452, 2011.
DOI : 10.1007/978-3-642-19867-0_37

URL : https://hal.archives-ouvertes.fr/hal-00730470

T. Kanungo, R. M. Haralick, H. S. Baird, W. Stuezle, and D. Madigan, A statistical, nonparametric methodology for document degradation model validation, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol.22, issue.11, pp.1209-1223, 2000.

T. A. Nartker, S. V. Rice, and F. R. Jenkins, Ocr accuracy: Unlv's fourth annual test, Inform, vol.9, issue.7, pp.38-46, 1995.

T. A. Nartker, S. V. Rice, and S. E. Lumos, <title>Software tools and test data for research and testing of page-reading OCR systems</title>, Document Recognition and Retrieval XII, pp.37-47, 2005.
DOI : 10.1117/12.587293

R. Smith, An Overview of the Tesseract OCR Engine, Ninth International Conference on Document Analysis and Recognition (ICDAR 2007) Vol 2, pp.629-633, 2007.
DOI : 10.1109/ICDAR.2007.4376991

L. Vincent, Morphological area openings and closings for greyscale images The Netherlands, sep 1992, Shape in Picture, pp.197-208