University of Oulu

Kuznetsov, Y., Sdobnov, A., Meglinski, I., Harmelin, A., & Kalchenko, V. (2019). Evaluation of handwriting peculiarities utilizing laser speckle contrast imaging. Laser Physics Letters, 16(11), 115601.

Evaluation of handwriting peculiarities utilizing laser speckle contrast imaging

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Author: Kuznetsov, Yuri1; Sdobnov, Anton2; Meglinski, Igor2,3,4,5,6;
Organizations: 1Department of Veterinary Resources, Weizmann Institute of Science, Rehovot, 76100, Israel
2Optoelectronics and Measurement Techniques Laboratory, University of Oulu, Oulu, 90570, Finland
3Interdisciplinary Laboratory of Biophotonics, National Research Tomsk State University, Tomsk 634050, Russia
4Institute of Engineering Physics for Biomedicine (PhysBio), National Research Nuclear University (MEPhI), Moscow, 115409, Russia
5School of Engineering and Applied Science, Aston Institute of Materials Research, Aston University, Birmingham, B4 7ET, United Kingdom
6School of Life and Health Sciences, Aston University, Birmingham, B4 7ET, United Kingdom
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.5 MB)
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Language: English
Published: IOP Publishing, 2019
Publish Date: 2022-11-30


Functional handwriting is a process involving various complex interactions between physical, cognitive and sensory systems. Since muscular motion is of a peculiar nature for each person, handwriting properties, such as pencil pressure and speed of writing, can be considered as a unique marker of identity. Moreover, impairments of handwriting in many cases are connected to neurodevelopmental disorders such as attention deficit hyperactivity disorder, developmental coordination disorder, autism spectrum disorders, Parkinson’s disease, etc. From this point of view, investigations of handwriting kinematics and pressure can be highly important for both forensic science and medicine. Commonly, the kinematic and pressure features of handwriting are evaluated using a graphics tablet with a stylus or electronic pens. The production of such devices is quite expensive. Therefore, the development of new methods for individual handwriting analysis is an important and current goal. Laser speckle contrast imaging (LSCI) is a powerful method, which is sensitive to both motion and pressure. Since the developed technique requires the use of only a simple laser diode and camera for image acquisition, LSCI is a cost-effective and practical tool for handwriting analysis. In the current letter we present a robust LSCI-based method for handwriting pressure and kinematics evaluation. The introduced approach was validated by an Archimedean spiral writing task.

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Series: Laser physics letters
ISSN: 1612-2011
ISSN-E: 1612-202X
ISSN-L: 1612-2011
Volume: 16
Issue: 11
Article number: 115601
DOI: 10.1088/1612-202X/ab43d7
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: The research of Vyacheslav Kalchenko was supported by The Henry Chanoch Krenter Institute for Biomedical Imaging and Genomics (Staff Scientists grant program). Authors acknowledge partial support from INFOTECH and Academy of Finland (grant projects: 326204), MEPhI Academic Excellence Project (Contract No. 02.a03.21.0005), and National Research Tomsk State 170 University Academic D.I. Mendeleev Fund Program. Anton Sdobnov was supported by Finnish Cultural Foundation (00180998) grant.
Academy of Finland Grant Number: 326204
Detailed Information: 326204 (Academy of Finland Funding decision)
Copyright information: © Copyright 2019 IOP Publishing. This is a peer-reviewed, un-copyedited version of an article accepted for publication/published in Laser Physics Letters. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at