Patent ID: 11893825
Assignee: THALES DIS FRANCE SAS
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 2:
3. The method of claim 1, wherein the local features being Delaunay minutiae triangles:
evaluating the similarity of the candidate fingerprint triangle and the reference fingerprint triangle of the current triangle pair comprises: computing a similarity score based on a edge length difference and/or a minutia edge angle difference and/or a minutia type between the candidate fingerprint triangle and the reference fingerprint triangle of the current triangle pair,
evaluating the geometric coherence of the candidate fingerprint triangles of the current triangle pair and of the different triangle pair with the reference fingerprint triangles of the current triangle pair and of the different triangle pair comprises: computing a geometric consistency score based on the variation, between the candidate fingerprint and the reference fingerprint, of the distance between the mass centers of the triangles of the current and of the different triangle pairs and/or based on the variation, between the candidate fingerprint and the reference fingerprint, of the relative orientation between the triangles of the current and of the different triangle pairs,
determining a match between the candidate fingerprint triangle and the reference fingerprint triangle of the current triangle pair comprises: computing a global coherence weight for the current triangle pair based on said similarity score and said geometric consistency scores computed for said current triangle pair and comparing said computed global coherence weight with a predetermined threshold,
determining a match between the candidate fingerprint and the reference fingerprint comprises: computing a final fingerprint matching score based on the similarity scores and global coherence weights of the triangle pairs whose computed global coherence weight is above said predetermined threshold.