Morphological Document Recovery In Hsi Space

Old documents frequently appear with digitalization errors, uneven background, bleed-through effect etc... Motivated by the challenge to improve printed and handwritten text, we developed a new approach based on morphological color operators using HSI color space. Our approach is composed of a morphological background estimation for foreground/background separation and text segmentation, a background smoothing and a color text recovery. Experimental results carried onto ancient documents have proven that ISH lexicographic order is the most effective to estimate the background and recover ancient texts in uneven and foxed background images. © 2013 Springer International Publishing.264 LNEE241250Aptoula, E., Lefèvre, S., Multivariate mathematical morphology applied to color image analysis (2009) Multivariate Image Processing, , Collet C, Chanussot J, Chehdi K (eds) Chapter 10Drira, F., Lebourgeois, F., Emptoz, H., A coupled mean shift-anisotropic diffusion approach for document image segmentation and restoration (2007) The 9th International Conference on Document Analysis and Recognition (ICDAR), pp. 814-818Gatos, B., Ntirogiannis, K., Pratikakis, I., ICDAR 2009 document image binarization contest (DIBCO 2009) (2009) International Conference on Document Analysis and Recognition, pp. 1375-1382Hanbury, A., (2001) Lexicographical Order in the HLS Colour Space, , Technical report N-04/01/MM, Centre de morphologie mathmatique, cole des Mines de ParisJohannsen, G., Bille, J., A threshold selectionmethod using informationmeasures (1982) Proceedings, 6th Internatiional Conference on Pattern Recognition, Munich, Germany, pp. 140-143Knuth, D.E., The art of computer programming (1998) Sorting and Searching, 3. , 2nd edn. Addison-WesleyPeters II, A., Mathematical morphology for anglevalued images (1970) Proceedings of SPIE, Non-linear Image Processing VIII, 3026, pp. 84-94Ramponi, G., Stanco, F., Dello Russo, W., Pelusi, S., Mauro, P., Digital automated restoration of manuscripts and antique printed books (2005) Proceedings of EVA 2005 Electronic Imaging and the Visual Arts, Firenze, Italy, pp. 764-767Soille, P., (2004) Morphological Image Analysis: Principles and Applications, , 2nd edn. Springe