Fingerprint block splicing method and system

A splicing system and fingerprint technology, applied in the acquisition/organization of fingerprints/palmprints, instruments, calculations, etc., can solve problems such as inaccurate fingerprint information, and achieve the effect of improving accuracy

Active Publication Date: 2018-10-26
SHANDONG UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] This application provides a fingerprint block splicing method and system to solve the problem of inaccurate fingerprint information spliced ​​by the traditional fingerprint block splicing method

Method used

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  • Fingerprint block splicing method and system
  • Fingerprint block splicing method and system
  • Fingerprint block splicing method and system

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Embodiment Construction

[0029] The application will be described in detail below in conjunction with the accompanying drawings.

[0030] like figure 1 As shown, it is a schematic flow chart of a fingerprint block splicing method provided by this application, see figure 1 , the method includes:

[0031] S101. Obtain minutiae points and ridge points in the fingerprint block.

[0032] The preprocessing process is the first step in the processing of fingerprint blocks, and is the basis for the subsequent correct extraction of fingerprint features. Due to the characteristics of the skin, the input device and the environment, the fingerprint block will have distortion, unclear, wet, noise and other factors that are unfavorable to feature extraction. Therefore, before feature extraction, the image should be preprocessed to eliminate the influence. The general preprocessing process includes image segmentation, image normalization, direction field, ridge frequency, Gabor filter, image binarization, and im...

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Abstract

The embodiment of the application discloses a fingerprint block splicing method and system. The fingerprint block splicing method comprises the following steps: obtaining detail points and ridge points in fingerprint blocks; performing preliminary alignment on the obtained fingerprint blocks according to the detail points and ridge points, then improving the accuracy of the location of each fingerprint block through global optimization; performing feature fusion on the aligned fingerprint blocks to complete the splicing of the fingerprint blocks. In order to obtain accurate fingerprint block alignment, in the alignment stage of partial fingerprint blocks, according to the alignment process from rough to accurate, the application first uses a partial fingerprint matching algorithm to calculate the pair-wise matching between fingerprint blocks to obtain the rough alignment of the fingerprint blocks, and then uses the global optimization method to improve the alignment accuracy of the fingerprint blocks to obtain accurate fingerprint block alignment results.

Description

technical field [0001] The present application relates to the technical field of fingerprint identification, in particular to a fingerprint block splicing method and system. Background technique [0002] Due to the uniqueness, easy acquisition and convenient identification of fingerprints, automatic fingerprint identification system (Automatic fingerprint identification system, AFIS) has been widely used in various fields. With the development of sensor technology, cheap and lightweight integrated solid-state fingerprint sensors have been widely used in various devices that require identity authentication. In order to facilitate embedding in devices and reduce costs, the sensing area of ​​the sensor is made very small. Since the contact area between this small solid-state sensor and the finger is very limited, the fingerprint obtained by this sensor is only a part of the entire fingerprint, resulting in very limited information that can be extracted from this partial finger...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
CPCG06V40/1359G06V40/12
Inventor 金长龙王宇萌孔祥雯
Owner SHANDONG UNIV
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