New fingerprint database retrieval method

The invention relates to a new fingerprint database retrieval method which comprises the following steps: carrying out coarse classification by using singularities; carrying out second-level classification by using information between the singularities; and carrying out third-level classification based on invariant moment features. In the invariant moment features based multilevel fingerprint database retrieval method disclosed by the invention, through introducing invariant moment features to establish a three-level indexing mechanism on an existing basis and extracting the orthogonal invariant moment features of ROI (regions of interest) (with a same reference point) of a fingerprint image in the third level, a defect that an input image has an effect on rotation and displacement is overcome, thereby improving the reliability and stability of a system. Research achievements of the invention have a high academic application value in the fields of fingerprint image analysis and identification, image retrieval, information security, and the like.