Transformation Optics with Windows

Oxburgh, S., White, C. D., Antoniou, G., Orife, E. and Courtial, J. (2014) Transformation Optics with Windows. In: Novel Optical Systems Design and Optimization XVII, San Diego, CA, USA, 17-21 Aug 2014, 91931E. (doi: 10.1117/12.2061404)

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.

• Item Type: Conference Proceedings
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Antoniou, Mr Georgios and White, Dr Christopher and Courtial, Dr Johannes and Oxburgh, Mr Stephen
• Authors: Oxburgh, S., White, C. D., Antoniou, G., Orife, E., and Courtial, J.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• ISSN: 0277-786X
• Copyright Holders: Copyright © 2014 SPIE
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher