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基于双目视觉和旋转云台的远距离虹膜识别系统 被引量:3

Iris Recognition System at a Distance Based on Stereo Vision and Pan-tilt-zoom Camera
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摘要 虹膜识别技术是一种新兴的生物特征识别技术,相对于指纹识别和人脸识别具有更高的准确率和稳定性,影响虹膜识别的瓶颈问题在于虹膜图像获取不太方便。当前该领域的热点就是研发一种可以在远距离、全自动地拍摄虹膜图像的设备,以解决虹膜识别的易用性问题。设计了一种基于双目视觉和旋转云台的远距离虹膜识别系统,该系统首先对摄像机进行标定,对双目摄像机中的人脸图像进行配准,从而估计人脸在空间中的大致位置;然后,系统利用旋转云台将虹膜摄像机自动对准人的眼睛并进行自动对焦,在捕获到清晰地虹膜图像后进行虹膜识别。实验证明,本文的立体视觉方法可以比较准确地定位物体空间位置,系统自动获取的虹膜图像质量好,识别率高。这种系统有望能够在未来的虹膜识别领域得以大规模应用。 Iris recognition is an emerging biometrics technology. It is more accurate and robust than fingerprint recognition and face recognition, but with a bottleneck of the inconvenience in iris image acquisition. Many recent studies focus on the automatic iris recognition at a distance to make the operation more convenient. In this study, an iris recognition system is designed at a distance based on a stereo vision and a pan-tilt unit. The stereo vision system is pre-calibrated. After the human face detection, the system makes a face image registration between two stereo-vision cameras and uses the corresponding relationship to estimate the accurate spatial position of human eyes. The pan-tih unit moves an iris camera towards the eye position, and with the auto-focusing function, the iris camera acquires high-quality iris images for the iris recognition. Experiments show that the stereo vision is accurate enough to estimate the spatial position and the acquired iris images are clear enough for a high performance of the iris recognition. The iris recognition system has a potential large-scale application in the future .
出处 《科技导报》 CAS CSCD 北大核心 2010年第5期34-39,共6页 Science & Technology Review
基金 <科技导报>博士生创新研究资助计划项目(kjdb20090102-5)
关键词 生物特征识别 虹膜识别 立体视觉 摄像机定标 旋转云台 虹膜图像获取 biometrics, iris recognition, iris image acquisition, stereo vision, camera calibration, pan-tilt unit
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参考文献14

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