Deformed fingerprint identification method based on local triangle structure characteristic collection

This invention relates to an identifying method for deformed fingerprints based on local triangle structure character set, on the basis of the character that relative deformation of fingerprint image is limit in local regions, which expresses fingerprints with a fuzzy character-local triangle structure character sets to convert the computation to integral similarity among fingerprints to similarity balance among character sets, first of all, which puts forward a fuzzy measurement method of similarity between two triangle structures then further makes up of a character vector composed of local similarities of all triangle structures then to map the pair of similarity vectors to a normalized number in the region of [0, 1] to quantize the integral similarity among fingerprint images to further get the matched result.