【作者】 张迪；

【导师】 傅德胜；

【作者基本信息】 南京气象学院 ， 系统分析与集成， 2003， 硕士

【摘要】 本文实现的自动指纹识别系统是针对民航乘客登机前的身份验证而研制开发的。该系统包括指纹采集仪、采样控制软件、识别软件、主机、外存和输出设备六部分。识别软件由指纹采集和指纹验证两个模块组成，是该系统的核心部分。指纹采集模块负责指纹的活体采集，并对其进行预处理和特征提取，将其特征向量按航班存入指纹库。指纹验证模块是将乘客登机时采集的指纹与其指纹库中的指纹相匹配，确定乘客身份。系统实现方法与优点如下： 1．使用采集模块通过指纹采集仪获取指纹的灰度图，实现了活体采集。使该系统的实时性得到了保证。 2．预处理时，先对采集的指纹进行灰度滤波，然后再通过计算块方向图对指纹进行方向图滤波，从而实现灰度修补。该方法避免了传统指纹处理时的二值化、细化过程，既可对指纹处理收到良好的效果，又可节约大量计算时间，更好的解决了指纹实时处理的问题。 3．通过计算指纹的局部方向图和不可定向程度，对指纹进行定位和分类，从而实现特征提取，并存入指纹库。此方法很好的解决了指纹的自动定位问题。 4．指纹验证时，按上述方法提取特征，将其与指纹库中指定指纹的特征进行匹配，确定购机票者与乘机者是否为同一人。 5．本文设计的自动指纹识别系统，在设计上强调界面的简洁性及易操作性，使该系统可以更快更广的被推广利用。更多还原

【Abstract】 In this paper, we established an automatic fingerprint identification system(AFIS) to verify passengers’ identity for civil airports. It include fingerprint scanner, scanner_controling software, identification software, computer, external memory, output machine. Identification software, the core of our AFIS, consists of fingerprint-image acquization module and fingerprint verification module. Fingerprint verification module is responsible of acquiring fingerprint-images, pretreating, extracting minutia and putting minutia vector into database by scheduled flight. Fingerprint verification module answer for matching minutia vector of passengers’ fingerprint to those of ticket_buyers in database to verify passengers’ identity. This is the method and merits of system implementation:1. Using fingerprint scanner with acquization module, we enhance the real-time speciality of gray_level imge acquization.2. In the pretreatment, we mend image by gray-level and direction-raph filtering. The program we proposed, without binarization and thinning, has high rapidity and saves a lot of calculation time.3. By local direction-graph and nondirectable level, we position automatically the center of fingerprint image and finish the assortment of fingerprint image .4. In fingerprint verification, we verify wehther the passenger and the ticket-buyer is the same person by matching the minutia vector of passenger and the ticket-buyer’s fingerprints in the database.5. AFIS we realized, will popularize rapidly for its interface succinctness and easy operation in software designed.更多还原