2024 Volume 53 Issue 2 Pages 110-120
This paper addresses the writer verification based on the character-shape, which is assumed to be an applied field of handwriting analysis in Japan. Writer verification has been conducted based on handwriting individuality. However, it is a problem that the within-writer variability reduces the performance of writer verification. In this paper, we first present that handwriting individuality exists in the within-writer variation. Then, in order to utilize the handwriting individuality hidden in the within-writer variation, we propose the new dissimilarity defined by Mahalanobis’ distance between the mean handwriting of a writer and a handwriting sample. Verification experiments using the proposed dissimilarity showed verification accuracy of 99.9% in the case of using one or two characters for Kanji, three characters for Hiragana and Katakana, and six or five characters for numeral.
