초록 ▼

A fingerprint image is divided into blocks of pixels. The blocks are determined to be within the foreground or background of the image. Each of the foreground blocks are assigned a block direction. If an image consists of the complete impression of the fingerprint, there should exist at least one pa

A fingerprint image is divided into blocks of pixels. The blocks are determined to be within the foreground or background of the image. Each of the foreground blocks are assigned a block direction. If an image consists of the complete impression of the fingerprint, there should exist at least one path (ridge), composes of foreground blocks, which lies on both half planes of a coordinate system with an origin at the centroid of the foreground and that comes sufficiently close to the x axis once the path crosses to the second half plane of the coordinate system.

대표청구항 ▼

[ We claim:] [1.] A system for determining from fingerprint images whether they are from partial prints comprising:a computer comprising at least one central processing unit, at least one memory, and at least one input device;at least one fingerprint image having a foreground and a background and be

[ We claim:] [1.] A system for determining from fingerprint images whether they are from partial prints comprising:a computer comprising at least one central processing unit, at least one memory, and at least one input device;at least one fingerprint image having a foreground and a background and being acquired by the input device and stored in the at least one memory; anda partial process that operates on said computer for determining if the fingerprint image is a non partial image by determining whether there exists a path on the fingerprint image, the path beginning at a start point in a first half plane of a Cartesian coordinate system with an x and a y axis and an origin located at a centroid of the foreground, the path crossing to a second half plane of the coordinate system and only then coming within a distance threshold of the x axis.