Cross Match Technologies Gmbh

Sonavation, Inc.

Richard Irving

Walter Guy Scott

George William McClurg

John F Carver

Joseph F Arnold

Omid S Jahromi

Trent G Francis

Rainer M Schmitt

John M Van Dusen

David Brian Clarke

Ronald A Kropp

Methods and apparatus for processing biometric digit data variously include scanning a digit in a transverse direction relative to an array of sensor elements, detecting the scanned digit and/or a predetermined characteristic of the scanned digit, outputting from individual sensor elements of the array of sensor elements respective continuous streams of biometric data associated with the scanned digit, discrete sampling the respective continuous streams of data, and reconstructing the discrete sampled data. The discrete sampled data may be directly reconstructed, e.g., in accordance with a reconstruction characteristic associated with detecting and/or discrete sampling the scanned digit, to form a biometric characteristic image associated with the digit. Optionally, the respective continuous streams of data may be stored for later discrete sampling, or discrete sampled data may be stored for later reconstruction to form a biometric characteristic image associated with the digit.

Methods and apparatus for digit swipe sensor data streaming

Provided is a fingerprint sensor configured for detecting a pulse of a human or other mammal. A time series of fingerprint images is analyzed to identify time-based variations in spatial location and/or pressure from ridges of a finger, where the variations result from time-based variations in the flow of blood. Based on the analysis, a determination is made if the time-based variations are indicative of a pulse in a digit of the person, and if so, a determination is made as to the pulse rate based on the variations. Imaging sensitivity of the digit at the fingerprint sensor is optimized for determination of the pulse. The time series of fingerprint images is also analyzed to determine if there is bulk motion of the digit, in which case pulse rate analysis is temporarily suspended.

Pulse-rate detection using a fingerprint sensor

Provided is a method for analyzing image slices. The method includes extracting first and second sub-slices from first and second image slices, respectively, and computing a shift between the first and second image slices based on the first and second sub-slices. The first and second sub-slices overlap. Also provided is a method for controlling a cursor on a screen. The method includes determining a shift between a first image slice and a second image slice and determining a displacement of the cursor on the screen based on the determined shift.

Navigation using fourier phase technique

Systems and methods for illuminating a platen are provided. A hybrid illumination system uses both diffusion and collimation to efficiently provide a flat, uniform illumination at a platen. One or more diffusers are disposed between the illumination source array and a collimating lens. An illumination system is provided which uses diffused light to illuminate a platen in a print scanner. The illumination system has an illumination source array and a light wedge. The light wedge reflects light internally which makes the illumination even more diffuse. Sources are divided into at least a center region and a perimeter region. The density of sources provided in the perimeter region is greater than in the center region to correct for natural light falloff in the illumination system. Intensity control can be performed individually or in groups.

Systems and methods for illuminating a platen in a print scanner

A calibration and correction procedure for a fingerprint scanner. The calibration and correction procedure performs an automatic calibration procedure and gray level linearity procedure. The automatic calibration procedure includes a brightness function to correct for distortions in brightness, a focus check function to identify when the fingerprint scanner is out of focus, and a geometric distortion function to correct for imperfect linearity in the geometry of the fingerprint scanner. The gray level linearity procedure corrects for linear distortions in brightness and contrast of gray levels.

Calibration and correction in a fingerprint scanner

Systems and methods for illuminating a platen are provided. A hybrid illumination system uses both diffusion and collimation to efficiently provide a flat, uniform illumination at a platen. One or more diffusers are disposed between the illumination source array and a collimating lens. An illumination system is provided which uses diffused light to illuminate a platen in a print scanner. The illumination system has an illumination source array and a light wedge. The light wedge reflects light internally which makes the illumination even more diffuse. An illumination source array has a plurality of sources that emit blue/green light. In one preferred example, the blue/green light is equal to or approximately equal to 510 nm. Sources are divided into at least a center region and a perimeter region. The density of sources provided in the perimeter region is greater than in the center region to correct for natural light falloff in the illumination system. Intensity control can be preformed individually or in groups.

A system and method for increasing image resolution in a palm print scanner. The method of the invention requires the synchronization of a nutating mirror with a camera frame sync. A first image is scanned at a first nutation position. The mirror is nutated by a fraction of a pixel amount in one direction. Another image is scanned at a second nutation position. The process of nutating the mirror to a different nutation position and scanning an image is repeated until all sub-pixels needed to increase an image resolution are obtained. All of the sub-pixels obtained are then interlaced to obtain a higher resolution image.

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Palm Beach Gardens, FL, United States of America

Richard Irving