초록 ▼

A system for matching images in which characteristic points of an image to be tested for a match, such as a fingerprint, are compared with characteristic points of a master image by attempting to match the distances between pairs of master characteristic points with distances between pairs of live c

A system for matching images in which characteristic points of an image to be tested for a match, such as a fingerprint, are compared with characteristic points of a master image by attempting to match the distances between pairs of master characteristic points with distances between pairs of live characteristic points, whereby the coordinate system of the test image is not required to be aligned with the coordinate system of the master image. The matching system can be implemented in an identification mode in which the live image is attempted to be matched with each of a number of master images, or a verification mode in which the live image is attempted to be matched with a master image that is purported to be the same as the live image.

대표청구항 ▼

A method of matching a live image and a master image having any random or nonrandom distribution of characteristic features throughout an image, comprising the steps of: generating a set of points representative of the characteristic features of the live image; generating a set of points representat

A method of matching a live image and a master image having any random or nonrandom distribution of characteristic features throughout an image, comprising the steps of: generating a set of points representative of the characteristic features of the live image; generating a set of points representative of the characteristic features of the master image; and evaluating the match between the live characteristic points and the master characteristic points, said step of evaluating consisting essentially of the further steps of: deriving the distances between a plurality of pairs of the live characteristic points; deriving the distances between a plurality of pairs of the master characteristic points; and comparing the live distances with the master distances to determine whether of not the live image matches the master image; wherein the steps of deriving the distances between pairs of the live characteristic points and deriving the distances between pairs of the master characteristic points comprise for each such step the step of forming, for each point in the set of points, a spectrum of values representing the distances between the point and each other point in the set of points.