Journal article  Restricted

A two-dimensional wavelet-based approach

Bozzi E., Cavaccini G., Chimenti M., Di Bono M. G., Salvetti O.

Image processing  I.4 Image Processing and Computer Vision  I.5.3 Clustering  I.5.4 Applications 

An image processing procedure is proposed to detect porosity defects in composite materials, analyzing C-scan images obtained by ultrasound inspection techniques. An image described by a set of features is analyzed in order to evaluate its similarity with a reference set. A 2D wavelet transform is applied to the input image and then a feature extraction based on statistics of the detailed images produced by the transform itself is performed. The principal component analysis technique (PCA) is then applied in order to map input features into an output plane maximizing data variance. Finally the image is classified considering the distance between points in the PCA plane. This procedure is also applied for the analysis of a single image. Preliminary results on simulation images and real C-scan maps show that the procedure is able to detect defects.

Source: Pattern recognition and image analysis 15-2 (2005): 516–519.

Publisher: Distributed by Allen Press,, Lawrence, KS , Stati Uniti d'America

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BibTeX entry
	title = {A two-dimensional wavelet-based approach},
	author = {Bozzi E. and Cavaccini G. and Chimenti M. and Di Bono M. G. and Salvetti O.},
	publisher = {Distributed by Allen Press,, Lawrence, KS , Stati Uniti d'America},
	year = {2005}