Extended depth of field system for long distance iris acquisition

Yung Lin Chen, Sheng Hsun Hsieh, Kuo En Hung, Shi Wen Yang, Yung Hui Li, Chung Hao Tien

研究成果: 書貢獻/報告類型會議論文篇章同行評審

1 引文 斯高帕斯(Scopus)


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.

主出版物標題Novel Optical Systems Design and Optimization XV
出版狀態已出版 - 2012
事件Novel Optical Systems Design and Optimization XV - San Diego, CA, United States
持續時間: 15 8月 201216 8月 2012


名字Proceedings of SPIE - The International Society for Optical Engineering


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國家/地區United States
城市San Diego, CA


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