作　　者： (吉紫娟）; (包佳祺）; (尹娟娟）;

机构地区： 湖北第二师范学院,湖北武汉430205

出　　处： 《应用光学》 2017年第5期770-776,共7页

摘　　要： 针对生物特征的多模识别技术,设计了一款用于指纹及手指静脉图像复合采集的光学系统。用于采集指纹和手指静脉图像的光学镜头分别由3片和12片球面透镜构成,工作波长分别为650nm和850nm,成像器件分别采用640pixel×480pixel CCD和640pixel×512pixel非制冷红外探测器。使用Zemax软件对该系统的光学结构进行了设计和优化。像质评价结果表明:指纹图像采集镜头在空间截止频率67lp/mm处,调制传递函数MTF值大于0.6;手指静脉图像采集镜头在空间截止频率30lp/mm处,调制传递函数MTF值大于0.8;两镜头各视场弥散斑均方根半径远小于成像器件像元尺寸,接近衍射极限,且成像畸变均小于0.5%。实验证明该系统采集到的图像质量优良,分辨率高。 Due to the biological multi-mode identification technology, an optical system for com-pound acquisition of fingerprint and finger vein multiple images was designed and described. The optic camera for collecting fingerprint and finger vein images contains respectively 3 and 12 spherical lenses,which works at 650 nm and 850 nm wavelength with a 640 × 480 CCD and a 640X 512 uncooled infrared（IR）detector as the imaging devices,respectively. With the aid of Ze-max software,the optical system was designed and optimized to cause a good imaging quality. Image quality evaluation results show that the modulation transfer function（MTF） value of the fingerprint imaging lens is above 0. 6 at 67 lp/mm, while the finger vein imaging lens is above 0. 8 at 30 lp/mm. The view field spots’ root-mean-square （RMS） radii of the 2 lenses are both much smaller than the detectors’ pixel size, which are close to the diffraction limit, and the dis-tortions are both less than 0. 5%. Experiments prove that images acquired by this optical system have the merits of fine image quality and high resolution.

关 键 词： 指纹图像 手指静脉 图像采集 光学设计