Development of a on-line signature verification system

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K04940
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 25020:Safety engineering-related
• Research Institution: National Research Institute of Police Science
• Principal Investigator: Seki Yoko 科学警察研究所, 法科学第四部, 特任研究官 (10356157)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 筆跡 / オンライン / オフライン / ペン先位置情報 / 筆圧変化 / 書字速度 / 複製文書 / ニューラルネットワーク

Outline of Final Research Achievements

The objective of this research was to develop writer identification methods for online handwriting and photocopied handwriting.
In the online handwriting identification experiments, trajectory and writing pressure change data or writing speed data were used for the identification. Trajectory and pen pressure change data showed high accuracy. Trajectory and pen speed data showed lower accuracy. This may suggest the appropriateness of relative change patterns in writer identification.
In the identification accuracy test of photocopied handwriting, ink-jet (IJ) or electrophotographic reproductions of the original handwriting samples were used for the identification experiments. The accuracy of both types of reproductions was lower than that of the originals. However, the accuracy of the electrophotographic method was more accurate than that of the IJ method, and it was found that identification was possible to a certain degree of accuracy even with only the image information.

Free Research Field

法科学

Academic Significance and Societal Importance of the Research Achievements

オンライン筆跡や複製文書などの新手法により取得された筆跡の筆者識別手法について研究を行い，これらの試料の識別手法を開発した．
オンライン筆跡の識別手法では，ペン先位置情報を用いた筆跡の概形に筆圧または書字速度を描くことにより，筆跡の形態情報と運動情報を可視化することができた．また本手法により従来の筆跡の形態に注目した筆者識別と同程度の精度で識別が行えた．学術的には，書字行動の可視化手法の開発および高精度な筆者識別手法の開発に意義があると考える．
社会的意義は，今後増加すると考えられる新手法により生成された筆跡や複製された筆跡の筆者識別手法の開発により，法科学の筆者識別に貢献したことと考える．