A handprinted character recognition system using image transformation based on partial inclination detection

Masato Suzuki, Nei Kato, Hirotomo Aso, Yoshiaki Nemoto

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


In recognition of handprinted characters, it is important to dissolve distortions of character caused by writer's habits. In order to dissolve distortions and to obtain better features, many image conversion methods have been proposed. But there are distortions that cannot be dissolved by these methods. One example is the case of parallel strokes which are spread out in fan shape. In this paper, in order to dissolve distortions, we propose a new image conversion method, Transformation based on Partial Inclination Detection (TPID), which is employed just before normalization, and is intended to dissolve several kinds of distortions in images of each character. TPID constructs transformation functions from inclination angles which are detected in some subspaces of the character's image, and converts images using the transformation functions. TPID is especially suitable for correcting the inclinations of horizontal and vertical strokes of a character. This has a powerful impact on the quality of the characteristic features. In recognition experiments using ETL9B, the largest database of handprinted characters in Japan, we have obtained a recognition rate of 99. 08%, which is the best to our knowledge.

Original languageEnglish
Pages (from-to)504-509
Number of pages6
JournalIEICE Transactions on Information and Systems
Issue number5
Publication statusPublished - 1996


  • ETL9B
  • Handprinted character
  • Recognition system
  • TPID

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Computer Vision and Pattern Recognition
  • Electrical and Electronic Engineering
  • Artificial Intelligence


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