Surface feature mapping using high resolution C-scan ultrasonogr

Details Surface feature mapping using high resolution C-scan ultrasonogr Surface feature mapping using high resolution C-scan ultrasonogr

1990-11-07

1993-06-29

Chapman, John E.

Image analysis

Histogram processing

For setting a threshold

73602, 73621, G06K 900, G01N 2900, G03B 4206

Patent

active

052241742

ABSTRACT:
An ultrasonic system and method for imaging a surface wherein a C-mode ultrasonic scan is performed over a fixed area of the surface and range gating is applied to that area to a given depth below the surface. For use of the system and method in fingerprint imaging, a live finger is placed upon a sensitive surface, the portion of the finger on the surface is scanned using the ultrasonic energy, and ultrasonic energy returned from the finger portion is received and converted into spatial frequency components to determine the pattern of ridges and valleys of the fingerprint. The ultrasonic imaging system comprises a probe for providing a directed output ultrasonic beam to scan the surface and to receive ultrasonic echos from the surface, a pulser-receiver to cause the probe to provide the output beam and to provide signals in response to the returned ultrasonic echos, a signal processing circuit for detecting and processing return echo signals from the pulser-receiver and a computer for storing and displaying information contained in signals from the processing circuit and for controlling operation of the processing circuit. The probe scans the surface along one direction, and then along another direction, the two directions preferably being orthogonal.

REFERENCES:
patent: 4385831 (1983-05-01), Ruell
patent: 4547898 (1985-10-01), Tsikos
patent: 4977601 (1990-12-01), Bicz

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