Crack image enhancement of track beam surface based on nonsubsampled contourlet transform

  • Authors:

  • Chunhua Guo;Tongqing Wang

  • Affiliations:

  • The Key Laboratory of Optoelectronic Technology & Systems of the Ministry of Education, Chong Qing University, Chong Qing;The Key Laboratory of Optoelectronic Technology & Systems of the Ministry of Education, Chong Qing University, Chong Qing

  • Venue:
  • LSMS/ICSEE'10 Proceedings of the 2010 international conference on Life system modeling and and intelligent computing, and 2010 international conference on Intelligent computing for sustainable energy and environment: Part I
  • Year:
  • 2010

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Abstract

A new algorithm of crack image enhancement of straddle-type monorail track beam surface based on nonsubsampled contourlet transform (NSCT) is presented. It is according to the characteristics of different domain in NSCT, and the fractional differentiation can enhance the mid-frequency and retain the low frequency nonlinearly. Then a new enhancement method has been proposed that the smooth sub-band texture of NSCT domain can be enhanced by the fractional differentiation; while in the high-frequency sub-bands of NSCT domain, each pixel of high-frequency sub-bands is divided into strong edge, weak edge and noise on the basis of direction sensitivity characteristics, then the weak edge can be enhanced nonlinearly, strong edge be retained, and noise be removed. Experimental results show that the method proposed in this paper have greatly improved visual effects and larger contrast improve index (CII) as compared with wavelet transform, and the enhancement effect is very good.