1
John P Riganati, Visvaldis A Vitols: Automatic pattern processing system. Rockwell International Corporation, L Lee Humphries, H Fredrick Hamann, Rolf M Pitts, April 24, 1979: US04151512 (190 worldwide citation)

An automatic system is described wherein pattern representations of epidermal ridges, such as fingerprints, are uniquely described by the extraction of specific information. Specific information such as ridge contour data, describing the ridge flow in the fingerprint pattern and minutiae data, princ ...


2
John P Riganati, Visvaldis A Vitols: Minutiae pattern matcher. Rockwell International Corporation, L Lee Humphries, H Fredrick Hamann, Rolf M Pitts, January 16, 1979: US04135147 (83 worldwide citation)

A system which, in one exemplary embodiment, comprises first means responsive to minutiae of first and second fingerprints for selectively generating a plurality of neighborhood comparison signals indicative of the closeness of match and coordinate displacements between minutiae neighborhoods of the ...


3
Visvaldis A Vitols, James E Paul Jr: Keyword detection in continuous speech using continuous asynchronous correlation. Rockwell International Corporation, H Frederick Hamann, Rolf M Pitts, George Jameson, March 28, 1978: US04081607 (81 worldwide citation)

A system for detecting one or more keywords in continuous speech is disclosed wherein a speech processor extracts a plurality of analog speech parameters from the input continuous speech, an STV (Spectral Time Vector) generator circuit selectively converts the plurality of analog speech parameters i ...


4
John P Riganati, Visvaldis A Vitols: Two-dimensional binary data enhancement system. Rockwell International Corporation, H Fredrick Hamann, Rolf M Pitts, George Jameson, January 11, 1977: US04003024 (72 worldwide citation)

A system for enhancing a binary data bit stream derived from a two-dimensional pattern image wherein, in a preferred embodiment, each data bit in the bit stream and a preselected group of bits associated therewith are sequentially stored in a first location and in associated preselected locations, r ...


5
Visvaldis A Vitols, Stanley A White: System for expanding the video contrast of an image. Rockwell International Corporation, L Lee Humphries, H Fredrick Hamann, Rolf M Pitts, February 5, 1980: US04187519 (59 worldwide citation)

A system, and method, is disclosed for substantially increasing the dynamic range of contrast of an input sequence of pixels representative of an image. In a preferred embodiment a first circuit is responsive to an input sequence of pixels representative of an image for developing bias and gain para ...


6
Visvaldis A Vitols, John P Riganati: Operator interactive pattern processing system. Rockwell International Corporation, H Fredrick Hamann, Harry John Staas, September 6, 1977: US04047154 (53 worldwide citation)

An operator interactive pattern processing system is described which combines high speed recognition and processing abilities of an automatic portion with the estimating and recognition abilities of a human operator to extract correct data from patterns, such as poor quality unidentified latent fing ...


7
James E Paul, Visvaldis A Vitols: Noise filtering device. Rockwell International Corporation, H Frederick Hamann, Rolf M Pitts, George Jameson, October 4, 1977: US04052559 (38 worldwide citation)

Noise such as hum (whose components are self-correlated over a long time-interval) is estimated (separated) from Signal such as speech (whose components are self-correlated only over a short time-interval) by using a time-domain transversal filter, whose tap-weight coefficients may be fixed (Wiener ...


8
John P Riganati, Visvaldis A Vitols: Binary image minutiae detector. Rockwell International Corporation, H Fredrick Hamann, Rolf M Pitts, George Jameson, April 4, 1978: US04083035 (31 worldwide citation)

An apparatus is described for detecting minutiae in a two-dimensional binary image. In a preferred embodiment a two-dimensional binary data bit stream of an image is enhanced in an enhancement circuit by pore-fill and line-thin operations. The enhanced binary data bit stream is then applied in paral ...


9
James E Paul Jr, Visvaldis A Vitols: Analog signal channel equalization with signal-in-noise embodiment. Rockwell International Corporation, H Fredrick Hamann, Rolf M Pitts, December 28, 1976: US04000369 (29 worldwide citation)

Apparatus for reducing (a) background noise in a signal channel, and (b) channel gain variations, useful with spectral analysis equipment. Two feed forward circuits are disclosed: one to enhance a signal in noise (deriving an estimated signal); the other for AGC (relative to a preselected level). Ba ...


10
Stanley A White, Visvaldis A Vitols: Nonlinear adaptive filter. Rockwell International Corporation, H Frederick Hamann, G A Montanye, David J Arthur, June 27, 1989: US04843583 (28 worldwide citation)

A nonlinear adaptive filter has an input and an output, and includes an adjustable linear filter and nonlinear filter connected serially between the input and output. The parameters for the adjustable linear filter are derived from signals on the adaptive filter output and from signals on the adapti ...