Finding and quantitative evaluation of minute bruise on metal surface using hairline

Mamoru Minami, Jianing Zhu, Masato Miura, Yasusi Mae

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A method to detect minute flaws on metal parts is proposed to remove the defective parts before assembling in a factory. The input gray-scale images of metal parts are used directly to recognize flaws without any image conversion to shorten recognition time. The recognition problem to find flaws and detect their positions on the metal parts is converted here to another problem to search for maximum peak and the variables giving the peak. Then the recognition problem can be treated as an optimization problem, and this conversion allows us to utilize the high performances of Genetic Algorithms in the optimization. The recognition rate of the proposed system was improved by changing the lighting condition so as to emphasize the contrast between the metal surface and the bruise using the reflection character of the hairline on the metal resulted by polishing process. The effectiveness and problems of proposed method are analyzed on standing points of recognition speed and quantitative recognition ability.

Original languageEnglish
Pages (from-to)2240-2247
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Issue number7
Publication statusPublished - Jul 2006
Externally publishedYes


  • Fault Detection
  • GA
  • Image Processing
  • Pattern Recognition

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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