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Sensors and Materials, Volume 37, Number 11(1) (2025)
Copyright(C) MYU K.K.
pp. 4891-4901
S&M4220 Letter
https://doi.org/10.18494/SAM5884
Published: November 7, 2025

Fingerprint-sensing Keycap: A Novel Concept with Verified Image Quality for Notebook Applications [PDF]

Hsiang-Hung Hsu, Yi-Pin Hsu, and Kuo-Chun Wei

(Received September 1, 2025; Accepted October 24, 2025)

Keywords: fingerprint image quality, NFIQ 2, fingerprint-sensing keycap, notebook

Traditionally, the notebook fingerprint application design has been limited to specific areas, such as the power key or touchpad. Additionally, its low-frequency usage has not been promoted for real-time protection and enhanced economic effects. In this paper, we propose an innovative system that creates a functional fingerprint-sensing keycap in notebooks. To verify that the concept is workable in the overall system, a mainboard controller and a host application program are implemented. An international score indicator metric is also for an objective comparison of the quality of acquired fingerprint images. The use of the fingerprint verification competition (FVC) open database results to verify the score accuracy constitutes a good and acceptable choice. From the results of the comparison of the verification scores from open databases and the proposed captured fingerprint images, the proposed fingerprint-sensing keycap system was found to yield excellent responses. Findings show that the resulting fingerprint image quality score of about 24.29, assessed on the basis of the National Institute of Standards and Technology fingerprint image quality (NFIQ) 2 score, is very close to those of images available in the FVC 2000 database 2 and FVC 2002 database 3, about 26.15 and 25.85, respectively. It is demonstrated that the innovative system is functional and the captured fingerprint image quality is acceptable. In the future, it is envisaged that this innovative concept and implemented system will enable the development of notebooks and the evolution of other industrial applications.

Corresponding author: Yi-Pin Hsu


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Cite this article
Hsiang-Hung Hsu, Yi-Pin Hsu, and Kuo-Chun Wei, Fingerprint-sensing Keycap: A Novel Concept with Verified Image Quality for Notebook Applications, Sens. Mater., Vol. 37, No. 11, 2025, p. 4891-4901.



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