Full Content is available to subscribers

Subscribe/Learn More  >

Image Subtraction Method in Digital Radiography of Welding

[+] Author Affiliations
Yasushi Ikeda, Yasutoshi Mizuta

Japan Fine Ceramics Center, Nagoya, Japan

Paper No. PVP2004-2832, pp. 165-170; 6 pages
  • ASME/JSME 2004 Pressure Vessels and Piping Conference
  • Recent Advances in Nondestructive Evaluation Techniques for Material Science and Industries
  • San Diego, California, USA, July 25–29, 2004
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4679-2
  • Copyright © 2004 by ASME


In order to improve contrast resolution in X-ray digital radiography, an image subtraction method was developed. Using a conventional image intensifier, welding lines of thick steel parts were tested. First the X-ray image was integrated in the image flame of an image processor used to minimize the random noise from X-ray statistic distribution. Next the image detector was slightly moved and again the X-ray image was taken, where the second image was subtracted from the first integrated image, which gave us significantly spatial noise reduction and extracting the images of only defects of welding. The contrast enhancement was possible to maximum level, so that the detectability of defects was greatly improved, being about 0.1% of detectability was obtained.

Copyright © 2004 by ASME
Topics: Welding



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In