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Proceedings Article

Compact touchless fingerprint reader based on digital variable-focus liquid lens

[+] Author Affiliations
C. W. Tsai

Lustrous Electro-Optics Co. Ltd. (Taiwan)

P. J. Wang, J. A. Yeh

National Tsing Hua Univ. (Taiwan)

Proc. SPIE 9193, Novel Optical Systems Design and Optimization XVII, 91930M (September 12, 2014); doi:10.1117/12.2061205
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From Conference Volume 9193

  • Novel Optical Systems Design and Optimization XVII
  • G. Groot Gregory; Arthur J. Davis
  • San Diego, California, United States | August 17, 2014

abstract

Identity certification in the cyberworld has always been troublesome if critical information and financial transaction must be processed. Biometric identification is the most effective measure to circumvent the identity issues in mobile devices. Due to bulky and pricy optical design, conventional optical fingerprint readers have been discarded for mobile applications. In this paper, a digital variable-focus liquid lens was adopted for capture of a floating finger via fast focusplane scanning. Only putting a finger in front of a camera could fulfill the fingerprint ID process. This prototyped fingerprint reader scans multiple focal planes from 30 mm to 15 mm in 0.2 second. Through multiple images at various focuses, one of the images is chosen for extraction of fingerprint minutiae used for identity certification. In the optical design, a digital liquid lens atop a webcam with a fixed-focus lens module is to fast-scan a floating finger at preset focus planes. The distance, rolling angle and pitching angle of the finger are stored for crucial parameters during the match process of fingerprint minutiae. This innovative compact touchless fingerprint reader could be packed into a minute size of 9.8*9.8*5 (mm) after the optical design and multiple focus-plane scan function are optimized. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

C. W. Tsai ; P. J. Wang and J. A. Yeh
" Compact touchless fingerprint reader based on digital variable-focus liquid lens ", Proc. SPIE 9193, Novel Optical Systems Design and Optimization XVII, 91930M (September 12, 2014); doi:10.1117/12.2061205; http://dx.doi.org/10.1117/12.2061205


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