標題: Extended depth of field system for long distance iris acquisition
作者: Chen, Yung-Lin
Hsieh, Sheng-Hsun
Hung, Kuo-En
Yang, Shi-Wen
Li, Yung-Hui
Tien, Chung-Hao
光電工程學系
Department of Photonics
關鍵字: iris recognition;extended depth of field;cubic phase mask
公開日期: 2012
摘要: Using biometric signatures for identity recognition has been practiced for centuries. Recently, iris recognition system attracts much attention due to its high accuracy and high stability. The texture feature of iris provides a signature that is unique for each subject. Currently most commercial iris recognition systems acquire images in less than 50 cm, which is a serious constraint that needs to be broken if we want to use it for airport access or entrance that requires high turn-over rate. In order to capture the iris patterns from a distance, in this study, we developed a telephoto imaging system with image processing techniques. By using the cubic phase mask positioned front of the camera, the point spread function was kept constant over a wide range of defocus. With adequate decoding filter, the blurred image was restored, where the working distance between the subject and the camera can be achieved over 3m associated with 500mm focal length and aperture F/6.3. The simulation and experimental results validated the proposed scheme, where the depth of focus of iris camera was triply extended over the traditional optics, while keeping sufficient recognition accuracy.
URI: http://hdl.handle.net/11536/20757
http://dx.doi.org/10.1117/12.928192
ISBN: 978-0-8194-9204-3
ISSN: 0277-786X
DOI: 10.1117/12.928192
期刊: NOVEL OPTICAL SYSTEMS DESIGN AND OPTIMIZATION XV
Volume: 8487
顯示於類別:會議論文


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  1. 000312205500020.pdf