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Fingerprint identification method of using image field-based non-rigid registration

A non-rigid registration, fingerprint recognition technology, applied in character and pattern recognition, acquisition/organization of fingerprints/palmprints, matching and classification, etc., can solve the problem of low fingerprint recognition accuracy, and achieve high-precision and fast fingerprint recognition. , to solve the effect of low recognition accuracy

Inactive Publication Date: 2018-03-23
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

[0006] The main purpose of the present invention is to provide a fingerprint recognition method using image field-based non-rigid registration to solve the problem of low fingerprint recognition accuracy caused by non-rigid deformation of fingerprints

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  • Fingerprint identification method of using image field-based non-rigid registration

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Embodiment Construction

[0018] The present invention will be further described below with reference to the accompanying drawings and in combination with preferred embodiments.

[0019] A specific embodiment of the present invention provides a fingerprint recognition method using image field-based non-rigid registration, such as Figure 1-4 As shown, the method specifically includes the following steps:

[0020] S1. Acquiring the image fields of the floating fingerprint and the reference fingerprint: extracting the direction field and gradient field information of the floating fingerprint image and its corresponding reference fingerprint image.

[0021] Specifically, a floating fingerprint image is F, and the gradient field is a vector whose magnitude can reflect the steepness of the fingerprint ridges, and whose direction is the normal direction of the fingerprint ridges, then the calculation of the gradient field can be expressed as:

[0022]

[0023] Among them, dF x Indicates the differenti...

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Abstract

A fingerprint identification method of using the image field-based non-rigid registration disclosed by the present invention comprises the following steps of S1 obtaining the image fields of a floating fingerprint and a reference fingerprint, namely extracting the respective direction field and gradient field information of two frames of to-be-registered fingerprint images, wherein the two framesof to-be-registered fingerprint images are separately a floating fingerprint image and a corresponding reference fingerprint image; S2 calculating a deformation field corresponding to the floating fingerprint image according to the direction field and gradient field information of the two frames of to-be-registered fingerprint images; S3 applying the deformation field to the floating fingerprint image to obtain a registered fingerprint image; S4 using the registered fingerprint image to match the reference fingerprint image. The fingerprint identification method of the present invention can solve the problem that due to the fingerprint non-rigid deformation, the fingerprint identification precision is lower.

Description

technical field [0001] The invention relates to the technical field of biological feature identification, in particular to a fingerprint identification method using non-rigid registration based on an image field. Background technique [0002] The traditional identification method mainly uses external objects such as identification items and identification knowledge to prove the identity. Once the identification items and identification knowledge that prove the identity are stolen or forgotten, the identity is easy to be impersonated or replaced by others. [0003] Compared with traditional identification methods, biometric identification technology mainly uses human biometrics for identity authentication, because human biometrics usually have the characteristics of not easy to forget, good anti-counterfeiting performance, not easy to forge or be stolen, "carry" with you, and available anytime, anywhere, etc. Compared with traditional authentication technology, biometric iden...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
CPCG06V40/1347G06V40/1365
Inventor 郭振华兰升周杰
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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