Multi-stage fingerprint database search method

Abstract

The invention relates to a multi-stage fingerprint database search method. The method comprises the following steps of: performing first-stage classification by using singular points; performing second-stage classification by using information between the singular points; and performing third-stage classification based on invariant moment characteristic. In the invariant moment characteristic-based multi-stage fingerprint database search method, the invariant moment characteristic is introduced on the existing basis to establish a three-stage search mechanism; and at the third stage, the defect of being influenced by rotation and displacement of an input image is overcome by extracting orthogonal invariant moment characteristic of a fingerprint image ROI (Region Of Interest) with the same reference point, so that the reliability and the stability of the system are improved. A research result has a higher academic application value in the fields of fingerprint image analysis, recognition, image retrieval, information security and the like.

Description

technical field [0001] The invention relates to a multi-level fingerprint database retrieval method, which performs fingerprint database indexing through fingerprint categories, information between singular points and invariant moment features. Background technique [0002] Image database technology is the product of the combination of image processing technology and database technology. Traditional databases mainly process text and numbers. With the development of image database technology, indexing technology based on relational databases can no longer efficiently process image databases. The indexing mechanism and matching method of the fingerprint database are also very different from those of the image database. Practice has shown that fingerprint identification technology has high accuracy and reliability today. The application of various fingerprint identification technologies needs to be connected with the fingerprint database, and the scale of the fingerprint data...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to propose a multi-level fingerprint database retrieval method, which can overcome the shortcomings of the traditional fingerprint database retrieval method based on minutiae and texture features, and through wavelet-based multi-resolution analysis and fast invariant moment analysis, in The third stage extracts the orthogonal invariant moment features of the fingerprint image for classification and indexing, which can solve difficult problems such as fingerprint image displacement and rotation changes in fingerprint database retrieval

Images