基於指紋特徵點磁碟式編碼之指紋辨識與硬體實現

指紋是相當可靠且獨特的生物特徵並常被應用於身分識別與保密安全上，近年來，行動裝置上也開始具有指紋的感測器來辨識使用者，對使用者而言，準確度與辨識的時間是相當重要的課題。有許多的研究在於提升指紋辨識的準確度與降低其辨識的時間；指紋特徵點圓柱式編碼(Minutiae Cylinder Code(MCC))是一項編碼的技術，記錄了指紋特徵點與周邊其他特徵點的相對分布關係，並使用區域與全域的比對來提升準確度，在指紋辨識上有很好的表現；然而其計算時間相當的長，因此，我們提出指紋特徵點立方體式編碼(Minutiae Cubic Structure Code (MCSC))，藉由簡化指紋特徵點圓柱式編碼的計算來達到降低指紋特徵點圓柱式編碼的辨識時間；我們更提出指紋特徵點磁碟式編碼(Minutiae Disk Code (MDC))的方法，更有效率與清楚地記錄與呈現鄰近特徵點的關係與分布情形，此方法在區域特徵編碼上比圓柱式編碼有280.08倍的加速，此外，提出的指紋特徵點磁碟式編碼在FVC2000與FVC2002的資料庫中有平均96.81%的辨識率。在硬體實作指紋特徵點磁碟式編碼中，對於在全域比對中的疊代運算採用了平行計算來加速指紋比對，此設計在TSMC 90nm的製程下的晶片核心面積為0.48mm2並達到工作頻率111MHz，在大小為255x255最多64個指紋特徵點的指紋影像上達到每秒1234次的指紋比對(每次比對花費0.81ms)，相較於MCC的方法有141.27倍的加速。

關鍵字

指紋辨識；指紋特徵點圓柱式編碼；指紋特徵點立方體式編碼；指紋特徵點磁碟式編碼

並列摘要

Fingerprint is one of the reliable and unique biometric features for the application of identity secure. Nowadays, mobile devices are also equipped with fingerprint sensor. The accuracy and the response time are important for the users. There are many researches aimed at raise the accuracy and reduce the computation time of fingerprint recognition. Minutiae cylinder code (MCC) is a coding method to encode the local neighbor minutiae and apply the local and global matching for fingerprint comparison, which has great performance on fingerprint recognition. However, the computation time of the MCC is high. Therefore, we proposed a minutiae cubic structure code (MCSC) method to speed up the computation time by simplifying the complex computation of the MCC. Furthermore, we proposed a new disk structure to encode the local structure for each minutia. The proposed minutiae disk code (MDC) encodes the neighbor minutiae more efficiently and clearly illustrate the distribution of the neighbor minutiae. The MDC method reduces the computation time by having 280.08x speed up in MCC encoding part on Matlab platform. In addition, the proposed MDC approach has high distinguish ability of the 96.81% recognition rate on the FVC2000 and FVC2002 datasets. The hardware implementation of MDC applies parallel computing on the relaxation process of global matching to accelerate the fingerprint comparison time. The implementation can achieve the operating frequency of 111MHz, conducting one fingerprint comparison of 0.81ms, which can process 1234 fingerprint images per second with the image size of 255x255 and the maximum of 64 minutiae, and with the core area of 0.48mm2 under TSMC 90nm technology. The hardware implementation has 141.27x speed up than the MCC method.

並列關鍵字

Fingerprint Recognition ； Minutiae Cylinder Code ； Minutiae Cubic Structure Code ； Minutiae Disk Code

參考文獻

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國際替代計量

基於指紋特徵點磁碟式編碼之指紋辨識與硬體實現

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