Quantitative Evaluation of Improved Global Interpolation in the Segmentation of Handwritten Numbers Overlapping a Border

Satoshi NAOI  Misako SUWA  Maki YABUKI  

IEICE TRANSACTIONS on Information and Systems   Vol.E79-D   No.5   pp.456-463
Publication Date: 1996/05/25
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Issue on Character Recognition and Document Understanding)
Category: Segmentation
character segmentation,  handwritten character recognition,  character overlapping borders,  component labeling,  interpolation,  

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The global interpolation method we proposed can extract a handwritten alpha-numeric character pattern even if it overlaps a border. Our method interpolates blank segments in a character after borders are removed by evaluating segment pattern continuity and connectedness globally to produce characters with smooth edges. The main feature of this method is to evaluate global component label connectivity as pattern connectedness. However, it is impossible for the method to interpolate missing superpositioning loop segments, because they lack segment pattern continuity and they have already had global component label connectivity. To solve this problem, we improved the method by adding loop interpolation as a global evaluation. The evaluation of character segment continuity is also improved to achieve higher quality character patterns. There is no database of overlapping characters, so we also propose an evaluation method which generates various kinds of overlapping numerals from an ETL database. Experimental results using these generated patterns showed that the improved global interpolation method is very effective for numbers that overlap a border.