Limbus impact on off-angle iris degradation
Limbus impact on off-angle iris degradation
复制标题
边缘对斜角虹膜退化的影响
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Joseph Thompson
中科院分区：
文献类型：
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作者：
M. Karakaya;Del R. Barstow;H. Santos;Joseph Thompson
虹膜识别的准确性取决于数据采集的质量，并受到角度、遮挡和扩张等因素的负面影响。离角虹膜识别是生物识别领域的一个新的研究热点，它试图解决角膜折射、复杂的3D虹膜纹理和模糊等问题。在这篇文章中，我们提出了另一个显著的挑战，它降低了离角虹膜识别系统的性能，称为“边缘效应”。角膜缘是角膜与巩膜交界处的区域。角膜缘是一种半透明的组织，遮挡了虹膜平面的一侧部分。最靠近相机一侧的遮挡虹膜纹理的量随着图像采集角度的增加而增加。如果不考虑虹膜边缘效应的影响，很难设计出准确的离角虹膜识别系统。据我们所知，这是第一个从生物统计学角度详细研究边缘效应的工作。基于真实图像和真实虹膜纹理的模拟实验结果，边缘效应增加了正向和离角虹膜图像之间的汉明距离分数，范围从0.05到0.2不等，具体取决于边缘高度。
The accuracy of iris recognition depends on the quality of data capture and is negatively affected by several factors such as angle, occlusion, and dilation. Off-angle iris recognition is a new research focus in biometrics that tries to address several issues including corneal refraction, complex 3D iris texture, and blur. In this paper, we present an additional significant challenge that degrades the performance of the off-angle iris recognition systems, called the “limbus effect”. The limbus is the region at the border of the cornea where the cornea joins the sclera. The limbus is a semitransparent tissue that occludes a side portion of the iris plane. The amount of occluded iris texture on the side nearest the camera increases as the image acquisition angle increases. Without considering the role of the limbus effect, it is difficult to design an accurate off-angle iris recognition system. To the best of our knowledge, this is the first work that investigates the limbus effect in detail from a biometrics perspective. Based on results from real images and simulated experiments with real iris texture, the limbus effect increases the hamming distance score between frontal and off-angle iris images ranging from 0.05 to 0.2 depending upon the limbus height.