Identification of defects from ECT signals using linear discriminant function

Weiying Cheng, Shigeru Kanemoto, Ichiro Komura

Research output: Chapter in Book/Report/Conference proceedingChapter


Statistical pattern recognition method is applied to eddy current testing (ECT) based defect identification in this work. Spatially distributed ECT signals are converted into a multi-dimensional space vector using data embedding method and the Fisher's discriminant is then applied to find the linear projection of the multi-dimensional data that best distinguish defect and non-defect signals. A set of potential defects are clearly distinguished from welding noise by utilizing the discriminant function derived from supervised learning. Furthermore, the correlation between the probability of detection and the dimension of constructed vector space is investigated. Both the false and miss detection probability decrease with the increase of vector dimension. The reliability of a discriminant method is significantly enhanced by increasing the dimension of vector space.

Original languageEnglish
Title of host publicationElectromagnetic Nondestructive Evaluation (X)
EditorsSeiki Takahashi, Hiroaki Kikuchi
Number of pages8
Publication statusPublished - 2007 Dec 1
Externally publishedYes

Publication series

NameStudies in Applied Electromagnetics and Mechanics
ISSN (Print)1383-7281
ISSN (Electronic)1879-8322


  • Eddy current testing
  • False/miss probability
  • Linear discriminate function
  • defect identification

ASJC Scopus subject areas

  • Mechanical Engineering
  • Electrical and Electronic Engineering


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