Defect Detection in Alloy Steel Surface Using Nonsubsampled Contourlet Transform

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
© 2014 by IJETT Journal
Volume-7 Number-2                          
Year of Publication : 2014
Authors : N.Vimalraj , Dr.B.Giriraj


N.Vimalraj , Dr.B.Giriraj , Article:Defect Detection in Alloy Steel Surface Using Nonsubsampled Contourlet Transform, International Journal of Engineering Trends and Technology(IJETT), 7(2),57-60, published by seventh sense research group


Surface defect detection of metallic surfaces is a major challenge in any manufacturing industry. In this paper, an automated system to classify alloy steel surface based on Nonsubsampled Contourlet Transform (NSCT) is presented. Firstly the images are decomposed into different scales and directional subbands using Nonsubsampled Contourlet Transform (NSCT). The nonsubsampled contourlet transform is built upon nonsubsampled pyramids and nonsubsampled directional filter banks and provides a shift invariant directional multiresolution image representation. The image is decomposed at various scales and directions and the energy features are extracted. The energy features of defect and non defective surface are extracted and the best set that distinguishes the surface is used for classification.


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NSCT, image classification, sub-band features, alloy steel surface.