Method of suppressing grain noise in ultrasonic waveform data by

Details Method of suppressing grain noise in ultrasonic waveform data by Method of suppressing grain noise in ultrasonic waveform data by

1993-09-27

1995-12-05

Raevis, Robert

Measuring and testing

Vibration

By mechanical waves

382141, 348619, G01N 2900

Patent

active

054718783

ABSTRACT:
A method of suppressing grain noise resulting from ultrasonic inspection of an object, including ultrasonically scanning an object and detecting waveform signals therefrom, determining, from the signals, data values which define a 3D waveform data set U(x,y,t) having both spatial (x,y) and temporal (t) ultrasonic data values from the scanned object, converting the 3D waveform data set into a 3D filtered waveform data set V(x,y,t) by performing a 3D filtering operation thereon, wherein for each data value in the 3D waveform data set U(x,y,t), a filtered data value is obtained by taking into account data values which are adjacent thereto both spatially and temporally, thereby reducing grain noise relative to flaw signals to enable a high probability of flaw detection and a low probability of false flaw indications.

REFERENCES:
patent: 4675532 (1987-06-01), Carson
patent: 4750367 (1988-06-01), Bernatets
patent: 4887306 (1989-12-01), Hwang et al.
"Digital Image Processing", Gonzalez et al, 1992, pp. 189-195.

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