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Fingerprint classification method based on fractal dimension and fingerprint three-level classification method

A technology of fractal dimension and classification method, which is applied in the direction of acquiring/arranging fingerprints/palmprints, matching and classification, instruments, etc., can solve problems such as non-unique classification results, uneven distribution probability, and reduced distinction between classes, to achieve The effect of fast retrieval speed, strong adaptability, improved accuracy and robustness

Active Publication Date: 2016-09-28
HUNAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

Most of these methods have two deficiencies: one is that the classification efficiency is reduced due to the uneven distribution probability of fingerprint categories in the natural environment; resulting in non-unique classification results

Method used

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  • Fingerprint classification method based on fractal dimension and fingerprint three-level classification method
  • Fingerprint classification method based on fractal dimension and fingerprint three-level classification method
  • Fingerprint classification method based on fractal dimension and fingerprint three-level classification method

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Embodiment 1

[0028] 1. Selection and extraction of multi-level classification features

[0029] The classification features used to realize the multi-level classification index for large-capacity fingerprint database should have good stability and separability. The present invention selects the inherent pattern type of the fingerprint, the number of ridges between singular points and the fractal dimension of the central area of ​​the fingerprint image as the classification features of each level. These features are stable and independent of each other, and have strong separability.

[0030] 1.1 Grain Type Classification

[0031] The basic pattern classification method divides fingerprints into five categories according to the position information of singular points of fingerprints. The present invention adopts the complex filtering method proposed by the document [9] to locate the central point and the triangular point of the fingerprint image. This method can not only calculate the type,...

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Abstract

A classification method provided in the invention adopts a step-by-step progressive fingerprint quality assessment algorithm of multiple discrimination factors to reject a low-quality fingerprint so that fingerprint identification accuracy is increased. Three-level classification is performed on the fingerprints with qualified quality. In a first level, according to a fingerprint grain type characteristic, the fingerprints are divided into six types; in a second level, a ridge line number among fingerprint singular points is taken as characteristic so as to carry out classification; and in a third level, a fractal dimension of a fingerprint image quality stabilization area is taken as a characteristic so as to carry out the classification. Through the second level classification and the third level classification, continuous classification and redundant retrieval can be realized so that accuracy and robustness of system classification are effectively increased. An experiment on NIST DB4 shows that the classification of the method provided in the invention is complete; a retrieval speed is fast; an adaptive capacity is high; the high robustness is possessed; and the method is especially suitable for rapid automatic identification of a high capacity fingerprint database.

Description

technical field [0001] The invention relates to the field of fingerprint analysis, more specifically, to a fingerprint classification method based on fractal dimension and a fingerprint three-level classification method. Background technique [0002] Accurate identification of personal identity to ensure information security is a key issue that must be solved in the era of network information. Although the automatic fingerprint identification system, as an effective means of identification, presents a huge development space and application prospect in the fields of public security, finance, e-commerce and personal information security, the current large-capacity fingerprint database automatic fingerprint identification The accuracy and practicability are not satisfactory, and the most critical fingerprint classification problem is a difficult point in the field of pattern recognition. [1 , 2] However, no significant breakthrough has been made, which seriously restricts th...

Claims

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Application Information

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IPC IPC(8): G06K9/00
CPCG06V40/1359G06V40/1365
Inventor 钟云飞彭小奇
Owner HUNAN UNIV OF TECH
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