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
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[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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