物方远心双指指纹采集光学系统设计  

Optical System Design of Object-Telecentric Dual Finger Fingerprint Scanner

作　　者：周路[1,2] 迟耀丹[1,2] 郭亮[2] 

机构地区：[1]吉林建筑大学电气与计算机学院,吉林长春130118 [2]吉林建筑大学吉林省建筑电气综合节能重点实验室,吉林长春130118

出　　处：《激光与光电子学进展》2016年第10期214-219,共6页Laser & Optoelectronics Progress

基　　金：吉林建筑大学博士启动基金(861117)

摘　　要：传统的光学式单指指纹采集仪存在采集窗口尺寸小、提取特征点有限以及指纹原始图像梯形畸变严重的问题,直接影响指纹识别的精度。为了获得高分辨率、高识别精度的指纹采集系统,从提高采集窗口尺寸以及校正梯形畸变的角度出发,设计了一种基于双指的物方远心指纹采集光学系统。利用Zemax光学设计软件,建立了物方远心光学系统模型,通过合理调整优化函数,平衡各种像差,获得了高成像质量,有效采集窗口尺寸达40.64 mm×38.10 mm,图像中心视场和边缘视场的调制传递函数值在对应特征频率167 lp/mm处均大于0.4,光学畸变率低于1%,系统分辨率为500 dpi。Traditional optical single finger fingerprint scanner has some problems, such as small scanning window, limited extracting feature point, serious trapezoidal distortion of fingerprint original image, which directly affect the accuracy of fingerprint identification. To acquire a fingerprint scanner system with high resolution and high identification accuracy, in this paper, the dual finger fingerprint scanner with object-telecentric optical system is designed, which enlarges the size of scanning window and corrects the angle of the trapezoidal distortion. An object- telecentric optical system model is established by Zemax optical design software. By adjusting the suitable merit function and balancing all kinds of aberration, high imaging quality is acquired. The size of effective scanning window is 40.64 mm×38.10 m. The modulation transfer function values of the center and edge view field of image are all bigger than 0.4 with corresponding characteristic frequency at 167 lp/mm, the optical distortion is less than 1%, and the system resolution is up to 500 dpi.

关 键 词：光学设计 指纹采集仪 物方远心 梯形畸变 双指 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]