Patent ID: 11874907
Assignee: ARCSOFT CORPORATION LIMITED
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 0:
1. A method for enhancing a fingerprint image, comprising:
eliminating a background texture of a fingerprint image of a current frame to obtain a pure fingerprint image;
performing a first pre-processing on the pure fingerprint image to obtain a first pre-processed image;
acquiring an effective area of the first pre-processed image;
performing direction field estimation and direction field correction on the effective area; and
performing a second pre-processing on the effective area after the direction field correction to obtain an enhanced fingerprint image;
wherein when the enhanced fingerprint image is a distorted fingerprint image, the method further comprising: performing the distortion correction on the distorted fingerprint image comprises; wherein performing the distortion correction on the distorted fingerprint image comprises: extracting a direction field and a periodic diagram of the distorted fingerprint image; searching for according to the direction field and the periodic diagram, a reference distorted fingerprint in a database set, closest to the distorted fingerprint image; and performing inverse transformation correction on the distorted fingerprint image according to the reference distorted fingerprint.