Results 201 to 210 of about 971,936 (265)

Defect detection in C-scan maps

Pattern Recognition and Image Analysis, 2007
An image processing procedure is proposed aiming at detecting porosity defects in materials used in the aerospace industry by means of the analysis of C-scan images obtained by ultrasound inspection techniques. An image is described through a number of features, which are then analyzed in order to evaluate the similarity of an unknown examined image ...
Bozzi E, Cavaccini G, Chimenti M, Di Bono M G, Salvetti O   +4 more
openaire   +2 more sources

Neural network correction of ultrasonic C-scan images

Ultrasonics, 1999
A neural network-based approach to the correction of C-scan images is presented. This allows the effects of a finite ultrasonic beam diameter in an immersion experiment to be considered, by training the network on a series of defects of known characteristics. The result is an image which is a better representation of the actual defect.
D A, Hutchins, A C, Pardoe, D R, Billson, E L, Hines   +3 more
openaire   +2 more sources

Ultrasonic C-scan imaging for material characterization

Ultrasonics, 1993
Abstract Advances in the field have enabled ultrasonic C-scan imaging to go beyond its classical application of detecting large single flaws to meet the challenge of non-destructive evaluation for modern engineered structures and new materials. Increased frequency of operation and novel transducer designs have led to micrometre resolution limits for ...
G.A. Gordon, S. Canumalla, B.R. Tittmann
openaire   +1 more source

Three-Dimensional Ultrasound C-Scan Imaging Using Holographic Reconstruction

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 1986
A three-dimensional ultrasound C-scan imaging method based on holographic reconstruction has been developed. Using wide angle coherent illumination of the object and holographic principles, high lateral resolution is achieved throughout the imaging space.
J, Ylitalo, E, Alasaarela, A, Tauriainen, K, Tervola, J, Koivukangas   +4 more
openaire   +2 more sources

Evaluation of ultrasonic C-scan attenuation image

IEEE 1991 Ultrasonics Symposium, 2002
Temporal averaging and homomorphic processing, which extract the local ultrasonic wavelet and estimate the attenuation coefficient, have been incorporated into C-scan imaging to generate and attenuation map. The variation of this map displays changes in the scattering cross section and in the absorption of materials.
T. Wang, J. Saniie
openaire   +1 more source

LOW-COST DEVICE FOR C-SCAN PHOTOACOUSTIC IMAGING

The Journal of the Acoustical Society of America, 2013
The prostate gland or other region of interest is stimulated with laser light, resulting in ultrasound waves (photoacoustic effect) which are focused by an acoustic lens and captured by a specific 1- or 2D sensor array and subsequently displayed as a C-scan on a computer screen.
Vikram S. Dogra, Navalgund A. H. K. Rao
openaire   +1 more source

An inexpensive computer-controlled ultrasonic C-scan system

NDT International, 1983
Abstract A microcomputer-controlled ultrasonic C-scan system is described with emphasis on interfacing and image formation. Examples are given which illustrate the potential of the system for quantitative C-scanning and image enhancement. The system was assembled from inexpensive off-the-shelf items of equipment.
M. Moghisi, D.P. Almond
openaire   +1 more source