04225850 is referenced by 102 patents and cites 7 patents.

Signalling means for enhancing the performance of automatic fingerprint identification systems by reducing system response to non-fingerprint-like regions within an image field pattern of interest. A two dimensional generalized sequency analyzer, such as a fast Fourier transform machine, responsive to a binary coded image signal identifies discrete frequency terms occurring within a selected bandwidth corresponding to a spatial frequency region of interest, associated with a fingerprint image. Logic means, responsive to the sequency analyzer, further identifies the relative energy levels of the bandwidth-limited spectral content of the binary coded image signal to signal the identity of a non-fingerprint-like region within the scanned image.

Title
Non-fingerprint region indicator
Application Number
5/960813
Publication Number
4225850
Application Date
November 15, 1978
Publication Date
September 30, 1980
Inventor
Stanley A White
Santa Ana
CA, US
John P Riganati
Yorba Linda
CA, US
Jimmy H Kabaian
Santa Ana
CA, US
Tien Lin Chang
Orange
CA, US
Agent
Rolf M Pitts
H Fredrick Hamann
L Lee Humphries
Assignee
Rockwell International Corporation
CA, US
IPC
A61B 5/10
G06K 9/00
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