Tsinghua University

Jianjiang Feng

Jie Zhou

Xiao Yang

Shihao Li

Xuanbin Si

Yijing Su

Embodiments of the present disclosure provide a fingerprint registration method and device. The method includes: obtaining a fingerprint to be registered and a target fingerprint, extracting fingerprint features from the fingerprint to be registered and the target fingerprint, in which the fingerprint features include a ridge feature and a phase feature, performing a rough registration using ridge features of the two fingerprints, and then obtaining phase difference information of phase features of the two fingerprints in a phase overlap region, adjusting the rough registration result according to the phase difference information to obtain a final registration result of the two fingerprints. In some embodiments, it does not simply depend on the ridge feature to perform the fingerprint registration and add the phase feature on the basis of the ridge feature, and perform twice registration, thereby improving the accuracy of fingerprint registration.

Fingerprint registration method and device

A method for estimating an orientation field of a fingerprint is provided, comprising: obtaining an initial orientation field of a fingerprint, and putting the initial orientation field in a reference coordinate system; obtaining N initial orientation blocks corresponding to the initial orientation field, and obtaining N orientation block sets corresponding to N positions respectively from a fingerprint dictionary; obtaining a similarity between each of the N initial orientation blocks and each orientation block in the N orientation block sets corresponding to the N positions to obtain P similarities, and selecting a preset number of candidate orientation blocks for each position from the orientation block set according to the P similarities; obtaining a compatibility between two candidate orientation blocks corresponding to any two adjacent positions respectively to obtain a plurality of compatibilities; and obtaining a candidate orientation block for each position according to the P similarities and the plurality of compatibilities.

Method and device for estimating orientation field of fingerprint

A method and a system for rectifying a distorted fingerprint are provided. The method includes following steps. A feature of a distorted fingerprint is extracted, a reference distorted fingerprint whose feature is matched with the feature of the distorted fingerprint is searched for in a reference distorted fingerprint database, a dense distortion field of the reference distorted fingerprint is obtained in the reference distorted fingerprint database and the distorted fingerprint is rectified to a normal one according to the dense distortion field of the reference distorted fingerprint.

Method and system for rectifying distorted fingerprint

A method and system for estimating a fingerprint pose are provided. The method includes following steps. A fingerprint image to be estimated is input, features are extracted from the fingerprint image to be estimated in all possible center positions and directions, each feature is scored via a classifier and a center position and direction corresponding to a feature of a highest score is selected as a fingerprint pose estimation result.

Method and system for estimating fingerprint pose

A method for registering a fingerprint image is provided. The method comprises steps of: establishing an orientation field template base according to M training fingerprints, wherein M is a positive integer larger than one; receiving a fingerprint image to be registered; obtaining an initial orientation field of the fingerprint image; obtaining an estimated position and an estimated direction of the fingerprint image according to the initial orientation field and the orientation field template base; and registering the fingerprint image according to a preset position, a preset direction, the estimated position and the estimated direction.

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Beijing, China

Jianjiang Feng