Coarse-to-fine fingerprint identification method fusing second-level and third-level features

Abstract

The invention provides a coarse-to-fine fingerprint identification method fusing second-level and third-level features. The method includes the following steps that firstly, a high-resolution fingerprint image database comprising the third-level fingerprint features is constructed; secondly, fingerprint minutiae features and the third-level features in a collected fingerprint image are calibrated; thirdly, whether the number of the minutiae features included in the collected fingerprint image is smaller than the threshold or not is judged, if yes, the step e is executed, and if not, the step d is executed; fourthly, the minutiae features are used for performing primary retrieving and matching, and a first candidate fingerprint set with a high matching score is solved; fifthly, accurate matching is performed with the third-level features, and a second candidate fingerprint set with a high matching score is solved; sixthly, the collected fingerprint image and fingerprints in the second candidate fingerprint set are determined. According to the coarse-to-fine fingerprint identification method fusing the second-level and third-level features, under the premise that efficiency is taken into consideration, the fingerprint retrieving and matching precision is achieved with high precision.

Description

technical field [0001] The invention relates to the field of fingerprint identification, in particular to a coarse-to-fine fingerprint identification method combining secondary and tertiary features. Background technique [0002] Fingerprint recognition technology has attracted much attention among many biometric technologies due to its easy-to-use, high-accuracy and low-cost characteristics, and has become one of the most effective means of identity authentication. widely used. The traditional fingerprint identification system uses fingerprint minutiae (ie, secondary features) as the characteristics of uniquely identifying fingerprints, and can achieve better fingerprint retrieval and matching accuracy in the case of small and medium-sized databases. [0003] The current police Automatic Fingerprint Identification System (AFIS) system mainly uses the fingerprint minutiae features to uniquely identify the fingerprints in the database. figure 1 Schematically shows the curre...

AI Technical Summary

Problems solved by technology

At the same time, with the development of fingerprint collection technology, live fingerprint collectors with a resolution of 1000dpi have gradually entered commercial use, and the continuous development of on-site latent fingerprint display technology has also effectively improved the quality of on-site fingerprint display. "502" fumigation and nano-materials And other display technologies enable the displayed fingerprints to reflect the third-level features, and the acquisition bottleneck that limits the application of the third-level features of fingerprints has been broken.

Images